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linux/drivers/clk/clk-lmk04832.c
Maxime Ripard 38bdfb21ed clk: lmk04832: clkout: Add a determine_rate hook 
The LKM04832 "CLKOUT" clock implements a mux with a set_parent hook, but
doesn't provide a determine_rate implementation.

This is a bit odd, since set_parent() is there to, as its name implies,
change the parent of a clock. However, the most likely candidate to
trigger that parent change is a call to clk_set_rate(), with
determine_rate() figuring out which parent is the best suited for a
given rate.

The other trigger would be a call to clk_set_parent(), but it's far less
used, and it doesn't look like there's any obvious user for that clock.

So, the set_parent hook is effectively unused, possibly because of an
oversight. However, it could also be an explicit decision by the
original author to avoid any reparenting but through an explicit call to
clk_set_parent().

The latter case would be equivalent to setting the flag
CLK_SET_RATE_NO_REPARENT, together with setting our determine_rate hook
to __clk_mux_determine_rate(). Indeed, if no determine_rate
implementation is provided, clk_round_rate() (through
clk_core_round_rate_nolock()) will call itself on the parent if
CLK_SET_RATE_PARENT is set, and will not change the clock rate
otherwise.

And if it was an oversight, then we are at least explicit about our
behavior now and it can be further refined down the line.

Since the CLK_SET_RATE_NO_REPARENT flag was already set though, it seems
unlikely.

Reviewed-by: Liam Beguin <liambeguin@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v4-16-971d5077e7d2@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2023-06-08 18:39:27 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* LMK04832 Ultra Low-Noise JESD204B Compliant Clock Jitter Cleaner
* Pin compatible with the LMK0482x family
*
* Datasheet: https://www.ti.com/lit/ds/symlink/lmk04832.pdf
*
* Copyright (c) 2020, Xiphos Systems Corp.
*
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/gcd.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
/* 0x000 - 0x00d System Functions */
#define LMK04832_REG_RST3W 0x000
#define LMK04832_BIT_RESET BIT(7)
#define LMK04832_BIT_SPI_3WIRE_DIS BIT(4)
#define LMK04832_REG_POWERDOWN 0x002
#define LMK04832_REG_ID_DEV_TYPE 0x003
#define LMK04832_REG_ID_PROD_MSB 0x004
#define LMK04832_REG_ID_PROD_LSB 0x005
#define LMK04832_REG_ID_MASKREV 0x006
#define LMK04832_REG_ID_VNDR_MSB 0x00c
#define LMK04832_REG_ID_VNDR_LSB 0x00d
/* 0x100 - 0x137 Device Clock and SYSREF Clock Output Control */
#define LMK04832_REG_CLKOUT_CTRL0(ch) (0x100 + (ch >> 1) * 8)
#define LMK04832_BIT_DCLK_DIV_LSB GENMASK(7, 0)
#define LMK04832_REG_CLKOUT_CTRL1(ch) (0x101 + (ch >> 1) * 8)
#define LMK04832_BIT_DCLKX_Y_DDLY_LSB GENMASK(7, 0)
#define LMK04832_REG_CLKOUT_CTRL2(ch) (0x102 + (ch >> 1) * 8)
#define LMK04832_BIT_CLKOUTX_Y_PD BIT(7)
#define LMK04832_BIT_DCLKX_Y_DDLY_PD BIT(4)
#define LMK04832_BIT_DCLKX_Y_DDLY_MSB GENMASK(3, 2)
#define LMK04832_BIT_DCLK_DIV_MSB GENMASK(1, 0)
#define LMK04832_REG_CLKOUT_SRC_MUX(ch) (0x103 + (ch % 2) + (ch >> 1) * 8)
#define LMK04832_BIT_CLKOUT_SRC_MUX BIT(5)
#define LMK04832_REG_CLKOUT_CTRL3(ch) (0x103 + (ch >> 1) * 8)
#define LMK04832_BIT_DCLKX_Y_PD BIT(4)
#define LMK04832_BIT_DCLKX_Y_DCC BIT(2)
#define LMK04832_BIT_DCLKX_Y_HS BIT(0)
#define LMK04832_REG_CLKOUT_CTRL4(ch) (0x104 + (ch >> 1) * 8)
#define LMK04832_BIT_SCLK_PD BIT(4)
#define LMK04832_BIT_SCLKX_Y_DIS_MODE GENMASK(3, 2)
#define LMK04832_REG_SCLKX_Y_ADLY(ch) (0x105 + (ch >> 1) * 8)
#define LMK04832_REG_SCLKX_Y_DDLY(ch) (0x106 + (ch >> 1) * 8)
#define LMK04832_BIT_SCLKX_Y_DDLY GENMASK(3, 0)
#define LMK04832_REG_CLKOUT_FMT(ch) (0x107 + (ch >> 1) * 8)
#define LMK04832_BIT_CLKOUT_FMT(ch) (ch % 2 ? 0xf0 : 0x0f)
#define LMK04832_VAL_CLKOUT_FMT_POWERDOWN 0x00
#define LMK04832_VAL_CLKOUT_FMT_LVDS 0x01
#define LMK04832_VAL_CLKOUT_FMT_HSDS6 0x02
#define LMK04832_VAL_CLKOUT_FMT_HSDS8 0x03
#define LMK04832_VAL_CLKOUT_FMT_LVPECL1600 0x04
#define LMK04832_VAL_CLKOUT_FMT_LVPECL2000 0x05
#define LMK04832_VAL_CLKOUT_FMT_LCPECL 0x06
#define LMK04832_VAL_CLKOUT_FMT_CML16 0x07
#define LMK04832_VAL_CLKOUT_FMT_CML24 0x08
#define LMK04832_VAL_CLKOUT_FMT_CML32 0x09
#define LMK04832_VAL_CLKOUT_FMT_CMOS_OFF_INV 0x0a
#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_OFF 0x0b
#define LMK04832_VAL_CLKOUT_FMT_CMOS_INV_INV 0x0c
#define LMK04832_VAL_CLKOUT_FMT_CMOS_INV_NOR 0x0d
#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_INV 0x0e
#define LMK04832_VAL_CLKOUT_FMT_CMOS_NOR_NOR 0x0f
/* 0x138 - 0x145 SYSREF, SYNC, and Device Config */
#define LMK04832_REG_VCO_OSCOUT 0x138
#define LMK04832_BIT_VCO_MUX GENMASK(6, 5)
#define LMK04832_VAL_VCO_MUX_VCO0 0x00
#define LMK04832_VAL_VCO_MUX_VCO1 0x01
#define LMK04832_VAL_VCO_MUX_EXT 0x02
#define LMK04832_REG_SYSREF_OUT 0x139
#define LMK04832_BIT_SYSREF_REQ_EN BIT(6)
#define LMK04832_BIT_SYSREF_MUX GENMASK(1, 0)
#define LMK04832_VAL_SYSREF_MUX_NORMAL_SYNC 0x00
#define LMK04832_VAL_SYSREF_MUX_RECLK 0x01
#define LMK04832_VAL_SYSREF_MUX_PULSER 0x02
#define LMK04832_VAL_SYSREF_MUX_CONTINUOUS 0x03
#define LMK04832_REG_SYSREF_DIV_MSB 0x13a
#define LMK04832_BIT_SYSREF_DIV_MSB GENMASK(4, 0)
#define LMK04832_REG_SYSREF_DIV_LSB 0x13b
#define LMK04832_REG_SYSREF_DDLY_MSB 0x13c
#define LMK04832_BIT_SYSREF_DDLY_MSB GENMASK(4, 0)
#define LMK04832_REG_SYSREF_DDLY_LSB 0x13d
#define LMK04832_REG_SYSREF_PULSE_CNT 0x13e
#define LMK04832_REG_FB_CTRL 0x13f
#define LMK04832_BIT_PLL2_RCLK_MUX BIT(7)
#define LMK04832_VAL_PLL2_RCLK_MUX_OSCIN 0x00
#define LMK04832_VAL_PLL2_RCLK_MUX_CLKIN 0x01
#define LMK04832_BIT_PLL2_NCLK_MUX BIT(5)
#define LMK04832_VAL_PLL2_NCLK_MUX_PLL2_P 0x00
#define LMK04832_VAL_PLL2_NCLK_MUX_FB_MUX 0x01
#define LMK04832_BIT_FB_MUX_EN BIT(0)
#define LMK04832_REG_MAIN_PD 0x140
#define LMK04832_BIT_PLL1_PD BIT(7)
#define LMK04832_BIT_VCO_LDO_PD BIT(6)
#define LMK04832_BIT_VCO_PD BIT(5)
#define LMK04832_BIT_OSCIN_PD BIT(4)
#define LMK04832_BIT_SYSREF_GBL_PD BIT(3)
#define LMK04832_BIT_SYSREF_PD BIT(2)
#define LMK04832_BIT_SYSREF_DDLY_PD BIT(1)
#define LMK04832_BIT_SYSREF_PLSR_PD BIT(0)
#define LMK04832_REG_SYNC 0x143
#define LMK04832_BIT_SYNC_CLR BIT(7)
#define LMK04832_BIT_SYNC_1SHOT_EN BIT(6)
#define LMK04832_BIT_SYNC_POL BIT(5)
#define LMK04832_BIT_SYNC_EN BIT(4)
#define LMK04832_BIT_SYNC_MODE GENMASK(1, 0)
#define LMK04832_VAL_SYNC_MODE_OFF 0x00
#define LMK04832_VAL_SYNC_MODE_ON 0x01
#define LMK04832_VAL_SYNC_MODE_PULSER_PIN 0x02
#define LMK04832_VAL_SYNC_MODE_PULSER_SPI 0x03
#define LMK04832_REG_SYNC_DIS 0x144
/* 0x146 - 0x14a CLKin Control */
#define LMK04832_REG_CLKIN_SEL0 0x148
#define LMK04832_REG_CLKIN_SEL1 0x149
#define LMK04832_REG_CLKIN_RST 0x14a
#define LMK04832_BIT_SDIO_RDBK_TYPE BIT(6)
#define LMK04832_BIT_CLKIN_SEL_MUX GENMASK(5, 3)
#define LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK 0x06
#define LMK04832_BIT_CLKIN_SEL_TYPE GENMASK(2, 0)
#define LMK04832_VAL_CLKIN_SEL_TYPE_OUT 0x03
/* 0x14b - 0x152 Holdover */
/* 0x153 - 0x15f PLL1 Configuration */
/* 0x160 - 0x16e PLL2 Configuration */
#define LMK04832_REG_PLL2_R_MSB 0x160
#define LMK04832_BIT_PLL2_R_MSB GENMASK(3, 0)
#define LMK04832_REG_PLL2_R_LSB 0x161
#define LMK04832_REG_PLL2_MISC 0x162
#define LMK04832_BIT_PLL2_MISC_P GENMASK(7, 5)
#define LMK04832_BIT_PLL2_MISC_REF_2X_EN BIT(0)
#define LMK04832_REG_PLL2_N_CAL_0 0x163
#define LMK04832_BIT_PLL2_N_CAL_0 GENMASK(1, 0)
#define LMK04832_REG_PLL2_N_CAL_1 0x164
#define LMK04832_REG_PLL2_N_CAL_2 0x165
#define LMK04832_REG_PLL2_N_0 0x166
#define LMK04832_BIT_PLL2_N_0 GENMASK(1, 0)
#define LMK04832_REG_PLL2_N_1 0x167
#define LMK04832_REG_PLL2_N_2 0x168
#define LMK04832_REG_PLL2_DLD_CNT_MSB 0x16a
#define LMK04832_REG_PLL2_DLD_CNT_LSB 0x16b
#define LMK04832_REG_PLL2_LD 0x16e
#define LMK04832_BIT_PLL2_LD_MUX GENMASK(7, 3)
#define LMK04832_VAL_PLL2_LD_MUX_PLL2_DLD 0x02
#define LMK04832_BIT_PLL2_LD_TYPE GENMASK(2, 0)
#define LMK04832_VAL_PLL2_LD_TYPE_OUT_PP 0x03
/* 0x16F - 0x555 Misc Registers */
#define LMK04832_REG_PLL2_PD 0x173
#define LMK04832_BIT_PLL2_PRE_PD BIT(6)
#define LMK04832_BIT_PLL2_PD BIT(5)
#define LMK04832_REG_PLL1R_RST 0x177
#define LMK04832_REG_CLR_PLL_LOST 0x182
#define LMK04832_REG_RB_PLL_LD 0x183
#define LMK04832_REG_RB_CLK_DAC_VAL_MSB 0x184
#define LMK04832_REG_RB_DAC_VAL_LSB 0x185
#define LMK04832_REG_RB_HOLDOVER 0x188
#define LMK04832_REG_SPI_LOCK 0x555
enum lmk04832_device_types {
LMK04832,
};
/**
* struct lmk04832_device_info - Holds static device information that is
* specific to the chip revision
*
* @pid: Product Identifier
* @maskrev: IC version identifier
* @num_channels: Number of available output channels (clkout count)
* @vco0_range: {min, max} of the VCO0 operating range (in MHz)
* @vco1_range: {min, max} of the VCO1 operating range (in MHz)
*/
struct lmk04832_device_info {
u16 pid;
u8 maskrev;
size_t num_channels;
unsigned int vco0_range[2];
unsigned int vco1_range[2];
};
static const struct lmk04832_device_info lmk04832_device_info[] = {
[LMK04832] = {
.pid = 0x63d1, /* WARNING PROD_ID is inverted in the datasheet */
.maskrev = 0x70,
.num_channels = 14,
.vco0_range = { 2440, 2580 },
.vco1_range = { 2945, 3255 },
},
};
enum lmk04832_rdbk_type {
RDBK_CLKIN_SEL0,
RDBK_CLKIN_SEL1,
RDBK_RESET,
};
struct lmk_dclk {
struct lmk04832 *lmk;
struct clk_hw hw;
u8 id;
};
struct lmk_clkout {
struct lmk04832 *lmk;
struct clk_hw hw;
bool sysref;
u32 format;
u8 id;
};
/**
* struct lmk04832 - The LMK04832 device structure
*
* @dev: reference to a struct device, linked to the spi_device
* @regmap: struct regmap instance use to access the chip
* @sync_mode: operational mode for SYNC signal
* @sysref_mux: select SYSREF source
* @sysref_pulse_cnt: number of SYSREF pulses generated while not in continuous
* mode.
* @sysref_ddly: SYSREF digital delay value
* @oscin: PLL2 input clock
* @vco: reference to the internal VCO clock
* @sclk: reference to the internal sysref clock (SCLK)
* @vco_rate: user provided VCO rate
* @reset_gpio: reference to the reset GPIO
* @dclk: list of internal device clock references.
* Each pair of clkout clocks share a single device clock (DCLKX_Y)
* @clkout: list of output clock references
* @clk_data: holds clkout related data like clk_hw* and number of clocks
*/
struct lmk04832 {
struct device *dev;
struct regmap *regmap;
unsigned int sync_mode;
unsigned int sysref_mux;
unsigned int sysref_pulse_cnt;
unsigned int sysref_ddly;
struct clk *oscin;
struct clk_hw vco;
struct clk_hw sclk;
unsigned int vco_rate;
struct gpio_desc *reset_gpio;
struct lmk_dclk *dclk;
struct lmk_clkout *clkout;
struct clk_hw_onecell_data *clk_data;
};
static bool lmk04832_regmap_rd_regs(struct device *dev, unsigned int reg)
{
switch (reg) {
case LMK04832_REG_RST3W ... LMK04832_REG_ID_MASKREV:
case LMK04832_REG_ID_VNDR_MSB:
case LMK04832_REG_ID_VNDR_LSB:
case LMK04832_REG_CLKOUT_CTRL0(0) ... LMK04832_REG_PLL2_DLD_CNT_LSB:
case LMK04832_REG_PLL2_LD:
case LMK04832_REG_PLL2_PD:
case LMK04832_REG_PLL1R_RST:
case LMK04832_REG_CLR_PLL_LOST ... LMK04832_REG_RB_DAC_VAL_LSB:
case LMK04832_REG_RB_HOLDOVER:
case LMK04832_REG_SPI_LOCK:
return true;
default:
return false;
};
}
static bool lmk04832_regmap_wr_regs(struct device *dev, unsigned int reg)
{
switch (reg) {
case LMK04832_REG_RST3W:
case LMK04832_REG_POWERDOWN:
return true;
case LMK04832_REG_ID_DEV_TYPE ... LMK04832_REG_ID_MASKREV:
case LMK04832_REG_ID_VNDR_MSB:
case LMK04832_REG_ID_VNDR_LSB:
return false;
case LMK04832_REG_CLKOUT_CTRL0(0) ... LMK04832_REG_PLL2_DLD_CNT_LSB:
case LMK04832_REG_PLL2_LD:
case LMK04832_REG_PLL2_PD:
case LMK04832_REG_PLL1R_RST:
case LMK04832_REG_CLR_PLL_LOST ... LMK04832_REG_RB_DAC_VAL_LSB:
case LMK04832_REG_RB_HOLDOVER:
case LMK04832_REG_SPI_LOCK:
return true;
default:
return false;
};
}
static const struct regmap_config regmap_config = {
.name = "lmk04832",
.reg_bits = 16,
.val_bits = 8,
.use_single_read = 1,
.use_single_write = 1,
.read_flag_mask = 0x80,
.write_flag_mask = 0x00,
.readable_reg = lmk04832_regmap_rd_regs,
.writeable_reg = lmk04832_regmap_wr_regs,
.cache_type = REGCACHE_NONE,
.max_register = LMK04832_REG_SPI_LOCK,
};
static int lmk04832_vco_is_enabled(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
unsigned int tmp;
int ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_MAIN_PD, &tmp);
if (ret)
return ret;
return !(FIELD_GET(LMK04832_BIT_OSCIN_PD, tmp) |
FIELD_GET(LMK04832_BIT_VCO_PD, tmp) |
FIELD_GET(LMK04832_BIT_VCO_LDO_PD, tmp));
}
static int lmk04832_vco_prepare(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
int ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_PD,
LMK04832_BIT_PLL2_PRE_PD |
LMK04832_BIT_PLL2_PD,
0x00);
if (ret)
return ret;
return regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
LMK04832_BIT_VCO_LDO_PD |
LMK04832_BIT_VCO_PD |
LMK04832_BIT_OSCIN_PD, 0x00);
}
static void lmk04832_vco_unprepare(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_PD,
LMK04832_BIT_PLL2_PRE_PD | LMK04832_BIT_PLL2_PD,
0xff);
/* Don't set LMK04832_BIT_OSCIN_PD since other clocks depend on it */
regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
LMK04832_BIT_VCO_LDO_PD | LMK04832_BIT_VCO_PD, 0xff);
}
static unsigned long lmk04832_vco_recalc_rate(struct clk_hw *hw,
unsigned long prate)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
const unsigned int pll2_p[] = {8, 2, 2, 3, 4, 5, 6, 7};
unsigned int pll2_n, p, pll2_r;
unsigned int pll2_misc;
unsigned long vco_rate;
u8 tmp[3];
int ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_PLL2_MISC, &pll2_misc);
if (ret)
return ret;
p = FIELD_GET(LMK04832_BIT_PLL2_MISC_P, pll2_misc);
ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_PLL2_N_0, &tmp, 3);
if (ret)
return ret;
pll2_n = FIELD_PREP(0x030000, tmp[0]) |
FIELD_PREP(0x00ff00, tmp[1]) |
FIELD_PREP(0x0000ff, tmp[2]);
ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_PLL2_R_MSB, &tmp, 2);
if (ret)
return ret;
pll2_r = FIELD_PREP(0x0f00, tmp[0]) |
FIELD_PREP(0x00ff, tmp[1]);
vco_rate = (prate << FIELD_GET(LMK04832_BIT_PLL2_MISC_REF_2X_EN,
pll2_misc)) * pll2_n * pll2_p[p] / pll2_r;
return vco_rate;
}
/**
* lmk04832_check_vco_ranges - Check requested VCO frequency against VCO ranges
*
* @lmk: Reference to the lmk device
* @rate: Desired output rate for the VCO
*
* The LMK04832 has 2 internal VCO, each with independent operating ranges.
* Use the device_info structure to determine which VCO to use based on rate.
*
* Returns: VCO_MUX value or negative errno.
*/
static int lmk04832_check_vco_ranges(struct lmk04832 *lmk, unsigned long rate)
{
struct spi_device *spi = to_spi_device(lmk->dev);
const struct lmk04832_device_info *info;
unsigned long mhz = rate / 1000000;
info = &lmk04832_device_info[spi_get_device_id(spi)->driver_data];
if (mhz >= info->vco0_range[0] && mhz <= info->vco0_range[1])
return LMK04832_VAL_VCO_MUX_VCO0;
if (mhz >= info->vco1_range[0] && mhz <= info->vco1_range[1])
return LMK04832_VAL_VCO_MUX_VCO1;
dev_err(lmk->dev, "%lu Hz is out of VCO ranges\n", rate);
return -ERANGE;
}
/**
* lmk04832_calc_pll2_params - Get PLL2 parameters used to set the VCO frequency
*
* @prate: parent rate to the PLL2, usually OSCin
* @rate: Desired output rate for the VCO
* @n: reference to PLL2_N
* @p: reference to PLL2_P
* @r: reference to PLL2_R
*
* This functions assumes LMK04832_BIT_PLL2_MISC_REF_2X_EN is set since it is
* recommended in the datasheet because a higher phase detector frequencies
* makes the design of wider loop bandwidth filters possible.
*
* the VCO rate can be calculated using the following expression:
*
* VCO = OSCin * 2 * PLL2_N * PLL2_P / PLL2_R
*
* Returns: vco rate or negative errno.
*/
static long lmk04832_calc_pll2_params(unsigned long prate, unsigned long rate,
unsigned int *n, unsigned int *p,
unsigned int *r)
{
unsigned int pll2_n, pll2_p, pll2_r;
unsigned long num, div;
/* Set PLL2_P to a fixed value to simplify optimizations */
pll2_p = 2;
div = gcd(rate, prate);
num = DIV_ROUND_CLOSEST(rate, div);
pll2_r = DIV_ROUND_CLOSEST(prate, div);
if (num > 4) {
pll2_n = num >> 2;
} else {
pll2_r = pll2_r << 2;
pll2_n = num;
}
if (pll2_n < 1 || pll2_n > 0x03ffff)
return -EINVAL;
if (pll2_r < 1 || pll2_r > 0xfff)
return -EINVAL;
*n = pll2_n;
*p = pll2_p;
*r = pll2_r;
return DIV_ROUND_CLOSEST(prate * 2 * pll2_p * pll2_n, pll2_r);
}
static long lmk04832_vco_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
unsigned int n, p, r;
long vco_rate;
int ret;
ret = lmk04832_check_vco_ranges(lmk, rate);
if (ret < 0)
return ret;
vco_rate = lmk04832_calc_pll2_params(*prate, rate, &n, &p, &r);
if (vco_rate < 0) {
dev_err(lmk->dev, "PLL2 parameters out of range\n");
return vco_rate;
}
if (rate != vco_rate)
return -EINVAL;
return vco_rate;
}
static int lmk04832_vco_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long prate)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, vco);
unsigned int n, p, r;
long vco_rate;
int vco_mux;
int ret;
vco_mux = lmk04832_check_vco_ranges(lmk, rate);
if (vco_mux < 0)
return vco_mux;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_VCO_OSCOUT,
LMK04832_BIT_VCO_MUX,
FIELD_PREP(LMK04832_BIT_VCO_MUX, vco_mux));
if (ret)
return ret;
vco_rate = lmk04832_calc_pll2_params(prate, rate, &n, &p, &r);
if (vco_rate < 0) {
dev_err(lmk->dev, "failed to determine PLL2 parameters\n");
return vco_rate;
}
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_R_MSB,
LMK04832_BIT_PLL2_R_MSB,
FIELD_GET(0x000700, r));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_R_LSB,
FIELD_GET(0x0000ff, r));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_MISC,
LMK04832_BIT_PLL2_MISC_P,
FIELD_PREP(LMK04832_BIT_PLL2_MISC_P, p));
if (ret)
return ret;
/*
* PLL2_N registers must be programmed after other PLL2 dividers are
* programmed to ensure proper VCO frequency calibration
*/
ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_0,
FIELD_GET(0x030000, n));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_1,
FIELD_GET(0x00ff00, n));
if (ret)
return ret;
return regmap_write(lmk->regmap, LMK04832_REG_PLL2_N_2,
FIELD_GET(0x0000ff, n));
}
static const struct clk_ops lmk04832_vco_ops = {
.is_enabled = lmk04832_vco_is_enabled,
.prepare = lmk04832_vco_prepare,
.unprepare = lmk04832_vco_unprepare,
.recalc_rate = lmk04832_vco_recalc_rate,
.round_rate = lmk04832_vco_round_rate,
.set_rate = lmk04832_vco_set_rate,
};
/*
* lmk04832_register_vco - Initialize the internal VCO and clock distribution
* path in PLL2 single loop mode.
*/
static int lmk04832_register_vco(struct lmk04832 *lmk)
{
const char *parent_names[1];
struct clk_init_data init;
int ret;
init.name = "lmk-vco";
parent_names[0] = __clk_get_name(lmk->oscin);
init.parent_names = parent_names;
init.ops = &lmk04832_vco_ops;
init.num_parents = 1;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_VCO_OSCOUT,
LMK04832_BIT_VCO_MUX,
FIELD_PREP(LMK04832_BIT_VCO_MUX,
LMK04832_VAL_VCO_MUX_VCO1));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_FB_CTRL,
LMK04832_BIT_PLL2_RCLK_MUX |
LMK04832_BIT_PLL2_NCLK_MUX,
FIELD_PREP(LMK04832_BIT_PLL2_RCLK_MUX,
LMK04832_VAL_PLL2_RCLK_MUX_OSCIN)|
FIELD_PREP(LMK04832_BIT_PLL2_NCLK_MUX,
LMK04832_VAL_PLL2_NCLK_MUX_PLL2_P));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_PLL2_MISC,
LMK04832_BIT_PLL2_MISC_REF_2X_EN,
LMK04832_BIT_PLL2_MISC_REF_2X_EN);
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_PLL2_LD,
FIELD_PREP(LMK04832_BIT_PLL2_LD_MUX,
LMK04832_VAL_PLL2_LD_MUX_PLL2_DLD) |
FIELD_PREP(LMK04832_BIT_PLL2_LD_TYPE,
LMK04832_VAL_PLL2_LD_TYPE_OUT_PP));
if (ret)
return ret;
lmk->vco.init = &init;
return devm_clk_hw_register(lmk->dev, &lmk->vco);
}
static int lmk04832_clkout_set_ddly(struct lmk04832 *lmk, int id)
{
const int dclk_div_adj[] = {0, 0, -2, -2, 0, 3, -1, 0};
unsigned int sclkx_y_ddly = 10;
unsigned int dclkx_y_ddly;
unsigned int dclkx_y_div;
unsigned int sysref_ddly;
unsigned int dclkx_y_hs;
unsigned int lsb, msb;
int ret;
ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL2(id),
LMK04832_BIT_DCLKX_Y_DDLY_PD,
FIELD_PREP(LMK04832_BIT_DCLKX_Y_DDLY_PD, 0));
if (ret)
return ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_SYSREF_DDLY_LSB, &lsb);
if (ret)
return ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_SYSREF_DDLY_MSB, &msb);
if (ret)
return ret;
sysref_ddly = FIELD_GET(LMK04832_BIT_SYSREF_DDLY_MSB, msb) << 8 | lsb;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(id), &lsb);
if (ret)
return ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(id), &msb);
if (ret)
return ret;
dclkx_y_div = FIELD_GET(LMK04832_BIT_DCLK_DIV_MSB, msb) << 8 | lsb;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL3(id), &lsb);
if (ret)
return ret;
dclkx_y_hs = FIELD_GET(LMK04832_BIT_DCLKX_Y_HS, lsb);
dclkx_y_ddly = sysref_ddly + 1 -
dclk_div_adj[dclkx_y_div < 6 ? dclkx_y_div : 7] -
dclkx_y_hs + sclkx_y_ddly;
if (dclkx_y_ddly < 7 || dclkx_y_ddly > 0x3fff) {
dev_err(lmk->dev, "DCLKX_Y_DDLY out of range (%d)\n",
dclkx_y_ddly);
return -EINVAL;
}
ret = regmap_write(lmk->regmap,
LMK04832_REG_SCLKX_Y_DDLY(id),
FIELD_GET(LMK04832_BIT_SCLKX_Y_DDLY, sclkx_y_ddly));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL1(id),
FIELD_GET(0x00ff, dclkx_y_ddly));
if (ret)
return ret;
dev_dbg(lmk->dev, "clkout%02u: sysref_ddly=%u, dclkx_y_ddly=%u, "
"dclk_div_adj=%+d, dclkx_y_hs=%u, sclkx_y_ddly=%u\n",
id, sysref_ddly, dclkx_y_ddly,
dclk_div_adj[dclkx_y_div < 6 ? dclkx_y_div : 7],
dclkx_y_hs, sclkx_y_ddly);
return regmap_update_bits(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(id),
LMK04832_BIT_DCLKX_Y_DDLY_MSB,
FIELD_GET(0x0300, dclkx_y_ddly));
}
/** lmk04832_sclk_sync - Establish deterministic phase relationship between sclk
* and dclk
*
* @lmk: Reference to the lmk device
*
* The synchronization sequence:
* - in the datasheet https://www.ti.com/lit/ds/symlink/lmk04832.pdf, p.31
* (8.3.3.1 How to enable SYSREF)
* - Ti forum: https://e2e.ti.com/support/clock-and-timing/f/48/t/970972
*
* Returns 0 or negative errno.
*/
static int lmk04832_sclk_sync_sequence(struct lmk04832 *lmk)
{
int ret;
int i;
/* 1. (optional) mute all sysref_outputs during synchronization */
/* 2. Enable and write device clock digital delay to applicable clocks */
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
LMK04832_BIT_SYSREF_DDLY_PD,
FIELD_PREP(LMK04832_BIT_SYSREF_DDLY_PD, 0));
if (ret)
return ret;
for (i = 0; i < lmk->clk_data->num; i += 2) {
ret = lmk04832_clkout_set_ddly(lmk, i);
if (ret)
return ret;
}
/*
* 3. Configure SYNC_MODE to SYNC_PIN and SYSREF_MUX to Normal SYNC,
* and clear SYSREF_REQ_EN (see 6.)
*/
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
LMK04832_BIT_SYSREF_REQ_EN |
LMK04832_BIT_SYSREF_MUX,
FIELD_PREP(LMK04832_BIT_SYSREF_REQ_EN, 0) |
FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
LMK04832_VAL_SYSREF_MUX_NORMAL_SYNC));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
LMK04832_BIT_SYNC_MODE,
FIELD_PREP(LMK04832_BIT_SYNC_MODE,
LMK04832_VAL_SYNC_MODE_ON));
if (ret)
return ret;
/* 4. Clear SYNXC_DISx or applicable clocks and clear SYNC_DISSYSREF */
ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0x00);
if (ret)
return ret;
/*
* 5. If SCLKX_Y_DDLY != 0, Set SYSREF_CLR=1 for at least 15 clock
* distribution path cycles (VCO cycles), then back to 0. In
* PLL2-only use case, this will be complete in less than one SPI
* transaction. If SYSREF local digital delay is not used, this step
* can be skipped.
*/
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
LMK04832_BIT_SYNC_CLR,
FIELD_PREP(LMK04832_BIT_SYNC_CLR, 0x01));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
LMK04832_BIT_SYNC_CLR,
FIELD_PREP(LMK04832_BIT_SYNC_CLR, 0x00));
if (ret)
return ret;
/*
* 6. Toggle SYNC_POL state between inverted and not inverted.
* If you use an external signal on the SYNC pin instead of toggling
* SYNC_POL, make sure that SYSREF_REQ_EN=0 so that the SYSREF_MUX
* does not shift into continuous SYSREF mode.
*/
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
LMK04832_BIT_SYNC_POL,
FIELD_PREP(LMK04832_BIT_SYNC_POL, 0x01));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
LMK04832_BIT_SYNC_POL,
FIELD_PREP(LMK04832_BIT_SYNC_POL, 0x00));
if (ret)
return ret;
/* 7. Set all SYNC_DISx=1, including SYNC_DISSYSREF */
ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0xff);
if (ret)
return ret;
/* 8. Restore state of SYNC_MODE and SYSREF_MUX to desired values */
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
LMK04832_BIT_SYSREF_MUX,
FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
lmk->sysref_mux));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYNC,
LMK04832_BIT_SYNC_MODE,
FIELD_PREP(LMK04832_BIT_SYNC_MODE,
lmk->sync_mode));
if (ret)
return ret;
/*
* 9. (optional) if SCLKx_y_DIS_MODE was used to mute SYSREF outputs
* during the SYNC event, restore SCLKx_y_DIS_MODE=0 for active state,
* or set SYSREF_GBL_PD=0 if SCLKx_y_DIS_MODE is set to a conditional
* option.
*/
/*
* 10. (optional) To reduce power consumption, after the synchronization
* event is complete, DCLKx_y_DDLY_PD=1 and SYSREF_DDLY_PD=1 disable the
* digital delay counters (which are only used immediately after the
* SYNC pulse to delay the output by some number of VCO counts).
*/
return ret;
}
static int lmk04832_sclk_is_enabled(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
unsigned int tmp;
int ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_MAIN_PD, &tmp);
if (ret)
return ret;
return FIELD_GET(LMK04832_BIT_SYSREF_PD, tmp);
}
static int lmk04832_sclk_prepare(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
return regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
LMK04832_BIT_SYSREF_PD, 0x00);
}
static void lmk04832_sclk_unprepare(struct clk_hw *hw)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
LMK04832_BIT_SYSREF_PD, LMK04832_BIT_SYSREF_PD);
}
static unsigned long lmk04832_sclk_recalc_rate(struct clk_hw *hw,
unsigned long prate)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
unsigned int sysref_div;
u8 tmp[2];
int ret;
ret = regmap_bulk_read(lmk->regmap, LMK04832_REG_SYSREF_DIV_MSB, &tmp, 2);
if (ret)
return ret;
sysref_div = FIELD_GET(LMK04832_BIT_SYSREF_DIV_MSB, tmp[0]) << 8 |
tmp[1];
return DIV_ROUND_CLOSEST(prate, sysref_div);
}
static long lmk04832_sclk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
unsigned long sclk_rate;
unsigned int sysref_div;
sysref_div = DIV_ROUND_CLOSEST(*prate, rate);
sclk_rate = DIV_ROUND_CLOSEST(*prate, sysref_div);
if (sysref_div < 0x07 || sysref_div > 0x1fff) {
dev_err(lmk->dev, "SYSREF divider out of range\n");
return -EINVAL;
}
if (rate != sclk_rate)
return -EINVAL;
return sclk_rate;
}
static int lmk04832_sclk_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long prate)
{
struct lmk04832 *lmk = container_of(hw, struct lmk04832, sclk);
unsigned int sysref_div;
int ret;
sysref_div = DIV_ROUND_CLOSEST(prate, rate);
if (sysref_div < 0x07 || sysref_div > 0x1fff) {
dev_err(lmk->dev, "SYSREF divider out of range\n");
return -EINVAL;
}
ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_MSB,
FIELD_GET(0x1f00, sysref_div));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DIV_LSB,
FIELD_GET(0x00ff, sysref_div));
if (ret)
return ret;
ret = lmk04832_sclk_sync_sequence(lmk);
if (ret)
dev_err(lmk->dev, "SYNC sequence failed\n");
return ret;
}
static const struct clk_ops lmk04832_sclk_ops = {
.is_enabled = lmk04832_sclk_is_enabled,
.prepare = lmk04832_sclk_prepare,
.unprepare = lmk04832_sclk_unprepare,
.recalc_rate = lmk04832_sclk_recalc_rate,
.round_rate = lmk04832_sclk_round_rate,
.set_rate = lmk04832_sclk_set_rate,
};
static int lmk04832_register_sclk(struct lmk04832 *lmk)
{
const char *parent_names[1];
struct clk_init_data init;
int ret;
init.name = "lmk-sclk";
parent_names[0] = clk_hw_get_name(&lmk->vco);
init.parent_names = parent_names;
init.ops = &lmk04832_sclk_ops;
init.flags = CLK_SET_RATE_PARENT;
init.num_parents = 1;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_SYSREF_OUT,
LMK04832_BIT_SYSREF_MUX,
FIELD_PREP(LMK04832_BIT_SYSREF_MUX,
lmk->sysref_mux));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DDLY_LSB,
FIELD_GET(0x00ff, lmk->sysref_ddly));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_DDLY_MSB,
FIELD_GET(0x1f00, lmk->sysref_ddly));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_SYSREF_PULSE_CNT,
ilog2(lmk->sysref_pulse_cnt));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap, LMK04832_REG_MAIN_PD,
LMK04832_BIT_SYSREF_DDLY_PD |
LMK04832_BIT_SYSREF_PLSR_PD,
FIELD_PREP(LMK04832_BIT_SYSREF_DDLY_PD, 0) |
FIELD_PREP(LMK04832_BIT_SYSREF_PLSR_PD, 0));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC,
FIELD_PREP(LMK04832_BIT_SYNC_POL, 0) |
FIELD_PREP(LMK04832_BIT_SYNC_EN, 1) |
FIELD_PREP(LMK04832_BIT_SYNC_MODE, lmk->sync_mode));
if (ret)
return ret;
ret = regmap_write(lmk->regmap, LMK04832_REG_SYNC_DIS, 0xff);
if (ret)
return ret;
lmk->sclk.init = &init;
return devm_clk_hw_register(lmk->dev, &lmk->sclk);
}
static int lmk04832_dclk_is_enabled(struct clk_hw *hw)
{
struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
struct lmk04832 *lmk = dclk->lmk;
unsigned int tmp;
int ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL3(dclk->id),
&tmp);
if (ret)
return ret;
return !FIELD_GET(LMK04832_BIT_DCLKX_Y_PD, tmp);
}
static int lmk04832_dclk_prepare(struct clk_hw *hw)
{
struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
struct lmk04832 *lmk = dclk->lmk;
return regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL3(dclk->id),
LMK04832_BIT_DCLKX_Y_PD, 0x00);
}
static void lmk04832_dclk_unprepare(struct clk_hw *hw)
{
struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
struct lmk04832 *lmk = dclk->lmk;
regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL3(dclk->id),
LMK04832_BIT_DCLKX_Y_PD, 0xff);
}
static unsigned long lmk04832_dclk_recalc_rate(struct clk_hw *hw,
unsigned long prate)
{
struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
struct lmk04832 *lmk = dclk->lmk;
unsigned int dclk_div;
unsigned int lsb, msb;
unsigned long rate;
int ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id),
&lsb);
if (ret)
return ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(dclk->id),
&msb);
if (ret)
return ret;
dclk_div = FIELD_GET(LMK04832_BIT_DCLK_DIV_MSB, msb) << 8 | lsb;
rate = DIV_ROUND_CLOSEST(prate, dclk_div);
return rate;
}
static long lmk04832_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
struct lmk04832 *lmk = dclk->lmk;
unsigned long dclk_rate;
unsigned int dclk_div;
dclk_div = DIV_ROUND_CLOSEST(*prate, rate);
dclk_rate = DIV_ROUND_CLOSEST(*prate, dclk_div);
if (dclk_div < 1 || dclk_div > 0x3ff) {
dev_err(lmk->dev, "%s_div out of range\n", clk_hw_get_name(hw));
return -EINVAL;
}
if (rate != dclk_rate)
return -EINVAL;
return dclk_rate;
}
static int lmk04832_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long prate)
{
struct lmk_dclk *dclk = container_of(hw, struct lmk_dclk, hw);
struct lmk04832 *lmk = dclk->lmk;
unsigned int dclk_div;
int ret;
dclk_div = DIV_ROUND_CLOSEST(prate, rate);
if (dclk_div > 0x3ff) {
dev_err(lmk->dev, "%s_div out of range\n", clk_hw_get_name(hw));
return -EINVAL;
}
/* Enable Duty Cycle Correction */
if (dclk_div == 1) {
ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL3(dclk->id),
LMK04832_BIT_DCLKX_Y_DCC,
FIELD_PREP(LMK04832_BIT_DCLKX_Y_DCC, 1));
if (ret)
return ret;
}
/*
* While using Divide-by-2 or Divide-by-3 for DCLK_X_Y_DIV, SYNC
* procedure requires to first program Divide-by-4 and then back to
* Divide-by-2 or Divide-by-3 before doing SYNC.
*/
if (dclk_div == 2 || dclk_div == 3) {
ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL2(dclk->id),
LMK04832_BIT_DCLK_DIV_MSB, 0x00);
if (ret)
return ret;
ret = regmap_write(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL0(dclk->id), 0x04);
if (ret)
return ret;
}
ret = regmap_write(lmk->regmap, LMK04832_REG_CLKOUT_CTRL0(dclk->id),
FIELD_GET(0x0ff, dclk_div));
if (ret)
return ret;
ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL2(dclk->id),
LMK04832_BIT_DCLK_DIV_MSB,
FIELD_GET(0x300, dclk_div));
if (ret)
return ret;
ret = lmk04832_sclk_sync_sequence(lmk);
if (ret)
dev_err(lmk->dev, "SYNC sequence failed\n");
return ret;
}
static const struct clk_ops lmk04832_dclk_ops = {
.is_enabled = lmk04832_dclk_is_enabled,
.prepare = lmk04832_dclk_prepare,
.unprepare = lmk04832_dclk_unprepare,
.recalc_rate = lmk04832_dclk_recalc_rate,
.round_rate = lmk04832_dclk_round_rate,
.set_rate = lmk04832_dclk_set_rate,
};
static int lmk04832_clkout_is_enabled(struct clk_hw *hw)
{
struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
struct lmk04832 *lmk = clkout->lmk;
unsigned int clkoutx_y_pd;
unsigned int sclkx_y_pd;
unsigned int tmp;
u32 enabled;
int ret;
u8 fmt;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_CTRL2(clkout->id),
&clkoutx_y_pd);
if (ret)
return ret;
enabled = !FIELD_GET(LMK04832_BIT_CLKOUTX_Y_PD, clkoutx_y_pd);
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
&tmp);
if (ret)
return ret;
if (FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp)) {
ret = regmap_read(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL4(clkout->id),
&sclkx_y_pd);
if (ret)
return ret;
enabled = enabled && !FIELD_GET(LMK04832_BIT_SCLK_PD, sclkx_y_pd);
}
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_FMT(clkout->id),
&tmp);
if (ret)
return ret;
if (clkout->id % 2)
fmt = FIELD_GET(0xf0, tmp);
else
fmt = FIELD_GET(0x0f, tmp);
return enabled && !fmt;
}
static int lmk04832_clkout_prepare(struct clk_hw *hw)
{
struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
struct lmk04832 *lmk = clkout->lmk;
unsigned int tmp;
int ret;
if (clkout->format == LMK04832_VAL_CLKOUT_FMT_POWERDOWN)
dev_err(lmk->dev, "prepared %s but format is powerdown\n",
clk_hw_get_name(hw));
ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL2(clkout->id),
LMK04832_BIT_CLKOUTX_Y_PD, 0x00);
if (ret)
return ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
&tmp);
if (ret)
return ret;
if (FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp)) {
ret = regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_CTRL4(clkout->id),
LMK04832_BIT_SCLK_PD, 0x00);
if (ret)
return ret;
}
return regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_FMT(clkout->id),
LMK04832_BIT_CLKOUT_FMT(clkout->id),
clkout->format << 4 * (clkout->id % 2));
}
static void lmk04832_clkout_unprepare(struct clk_hw *hw)
{
struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
struct lmk04832 *lmk = clkout->lmk;
regmap_update_bits(lmk->regmap, LMK04832_REG_CLKOUT_FMT(clkout->id),
LMK04832_BIT_CLKOUT_FMT(clkout->id),
0x00);
}
static int lmk04832_clkout_set_parent(struct clk_hw *hw, uint8_t index)
{
struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
struct lmk04832 *lmk = clkout->lmk;
return regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
LMK04832_BIT_CLKOUT_SRC_MUX,
FIELD_PREP(LMK04832_BIT_CLKOUT_SRC_MUX,
index));
}
static uint8_t lmk04832_clkout_get_parent(struct clk_hw *hw)
{
struct lmk_clkout *clkout = container_of(hw, struct lmk_clkout, hw);
struct lmk04832 *lmk = clkout->lmk;
unsigned int tmp;
int ret;
ret = regmap_read(lmk->regmap, LMK04832_REG_CLKOUT_SRC_MUX(clkout->id),
&tmp);
if (ret)
return ret;
return FIELD_GET(LMK04832_BIT_CLKOUT_SRC_MUX, tmp);
}
static const struct clk_ops lmk04832_clkout_ops = {
.is_enabled = lmk04832_clkout_is_enabled,
.prepare = lmk04832_clkout_prepare,
.unprepare = lmk04832_clkout_unprepare,
.determine_rate = __clk_mux_determine_rate,
.set_parent = lmk04832_clkout_set_parent,
.get_parent = lmk04832_clkout_get_parent,
};
static int lmk04832_register_clkout(struct lmk04832 *lmk, const int num)
{
char name[] = "lmk-clkoutXX";
char dclk_name[] = "lmk-dclkXX_YY";
const char *parent_names[2];
struct clk_init_data init;
int dclk_num = num / 2;
int ret;
if (num % 2 == 0) {
sprintf(dclk_name, "lmk-dclk%02d_%02d", num, num + 1);
init.name = dclk_name;
parent_names[0] = clk_hw_get_name(&lmk->vco);
init.ops = &lmk04832_dclk_ops;
init.flags = CLK_SET_RATE_PARENT;
init.num_parents = 1;
lmk->dclk[dclk_num].id = num;
lmk->dclk[dclk_num].lmk = lmk;
lmk->dclk[dclk_num].hw.init = &init;
ret = devm_clk_hw_register(lmk->dev, &lmk->dclk[dclk_num].hw);
if (ret)
return ret;
} else {
sprintf(dclk_name, "lmk-dclk%02d_%02d", num - 1, num);
}
if (of_property_read_string_index(lmk->dev->of_node,
"clock-output-names",
num, &init.name)) {
sprintf(name, "lmk-clkout%02d", num);
init.name = name;
}
parent_names[0] = dclk_name;
parent_names[1] = clk_hw_get_name(&lmk->sclk);
init.parent_names = parent_names;
init.ops = &lmk04832_clkout_ops;
init.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT;
init.num_parents = ARRAY_SIZE(parent_names);
lmk->clkout[num].id = num;
lmk->clkout[num].lmk = lmk;
lmk->clkout[num].hw.init = &init;
lmk->clk_data->hws[num] = &lmk->clkout[num].hw;
/* Set initial parent */
regmap_update_bits(lmk->regmap,
LMK04832_REG_CLKOUT_SRC_MUX(num),
LMK04832_BIT_CLKOUT_SRC_MUX,
FIELD_PREP(LMK04832_BIT_CLKOUT_SRC_MUX,
lmk->clkout[num].sysref));
return devm_clk_hw_register(lmk->dev, &lmk->clkout[num].hw);
}
static int lmk04832_set_spi_rdbk(const struct lmk04832 *lmk, const int rdbk_pin)
{
int reg;
int ret;
dev_info(lmk->dev, "setting up 4-wire mode\n");
ret = regmap_write(lmk->regmap, LMK04832_REG_RST3W,
LMK04832_BIT_SPI_3WIRE_DIS);
if (ret)
return ret;
switch (rdbk_pin) {
case RDBK_CLKIN_SEL0:
reg = LMK04832_REG_CLKIN_SEL0;
break;
case RDBK_CLKIN_SEL1:
reg = LMK04832_REG_CLKIN_SEL1;
break;
case RDBK_RESET:
reg = LMK04832_REG_CLKIN_RST;
break;
default:
return -EINVAL;
}
return regmap_write(lmk->regmap, reg,
FIELD_PREP(LMK04832_BIT_CLKIN_SEL_MUX,
LMK04832_VAL_CLKIN_SEL_MUX_SPI_RDBK) |
FIELD_PREP(LMK04832_BIT_CLKIN_SEL_TYPE,
LMK04832_VAL_CLKIN_SEL_TYPE_OUT));
}
static int lmk04832_probe(struct spi_device *spi)
{
const struct lmk04832_device_info *info;
int rdbk_pin = RDBK_CLKIN_SEL1;
struct device_node *child;
struct lmk04832 *lmk;
u8 tmp[3];
int ret;
int i;
info = &lmk04832_device_info[spi_get_device_id(spi)->driver_data];
lmk = devm_kzalloc(&spi->dev, sizeof(struct lmk04832), GFP_KERNEL);
if (!lmk)
return -ENOMEM;
lmk->dev = &spi->dev;
lmk->oscin = devm_clk_get(lmk->dev, "oscin");
if (IS_ERR(lmk->oscin)) {
dev_err(lmk->dev, "failed to get oscin clock\n");
return PTR_ERR(lmk->oscin);
}
ret = clk_prepare_enable(lmk->oscin);
if (ret)
return ret;
lmk->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
GPIOD_OUT_LOW);
lmk->dclk = devm_kcalloc(lmk->dev, info->num_channels >> 1,
sizeof(struct lmk_dclk), GFP_KERNEL);
if (!lmk->dclk) {
ret = -ENOMEM;
goto err_disable_oscin;
}
lmk->clkout = devm_kcalloc(lmk->dev, info->num_channels,
sizeof(*lmk->clkout), GFP_KERNEL);
if (!lmk->clkout) {
ret = -ENOMEM;
goto err_disable_oscin;
}
lmk->clk_data = devm_kzalloc(lmk->dev, struct_size(lmk->clk_data, hws,
info->num_channels),
GFP_KERNEL);
if (!lmk->clk_data) {
ret = -ENOMEM;
goto err_disable_oscin;
}
device_property_read_u32(lmk->dev, "ti,vco-hz", &lmk->vco_rate);
lmk->sysref_ddly = 8;
device_property_read_u32(lmk->dev, "ti,sysref-ddly", &lmk->sysref_ddly);
lmk->sysref_mux = LMK04832_VAL_SYSREF_MUX_CONTINUOUS;
device_property_read_u32(lmk->dev, "ti,sysref-mux",
&lmk->sysref_mux);
lmk->sync_mode = LMK04832_VAL_SYNC_MODE_OFF;
device_property_read_u32(lmk->dev, "ti,sync-mode",
&lmk->sync_mode);
lmk->sysref_pulse_cnt = 4;
device_property_read_u32(lmk->dev, "ti,sysref-pulse-count",
&lmk->sysref_pulse_cnt);
for_each_child_of_node(lmk->dev->of_node, child) {
int reg;
ret = of_property_read_u32(child, "reg", &reg);
if (ret) {
dev_err(lmk->dev, "missing reg property in child: %s\n",
child->full_name);
of_node_put(child);
goto err_disable_oscin;
}
of_property_read_u32(child, "ti,clkout-fmt",
&lmk->clkout[reg].format);
if (lmk->clkout[reg].format >= 0x0a && reg % 2 == 0
&& reg != 8 && reg != 10)
dev_err(lmk->dev, "invalid format for clkout%02d\n",
reg);
lmk->clkout[reg].sysref =
of_property_read_bool(child, "ti,clkout-sysref");
}
lmk->regmap = devm_regmap_init_spi(spi, &regmap_config);
if (IS_ERR(lmk->regmap)) {
dev_err(lmk->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(lmk->regmap));
ret = PTR_ERR(lmk->regmap);
goto err_disable_oscin;
}
regmap_write(lmk->regmap, LMK04832_REG_RST3W, LMK04832_BIT_RESET);
if (!(spi->mode & SPI_3WIRE)) {
device_property_read_u32(lmk->dev, "ti,spi-4wire-rdbk",
&rdbk_pin);
ret = lmk04832_set_spi_rdbk(lmk, rdbk_pin);
if (ret)
goto err_disable_oscin;
}
regmap_bulk_read(lmk->regmap, LMK04832_REG_ID_PROD_MSB, &tmp, 3);
if ((tmp[0] << 8 | tmp[1]) != info->pid || tmp[2] != info->maskrev) {
dev_err(lmk->dev, "unsupported device type: pid 0x%04x, maskrev 0x%02x\n",
tmp[0] << 8 | tmp[1], tmp[2]);
ret = -EINVAL;
goto err_disable_oscin;
}
ret = lmk04832_register_vco(lmk);
if (ret) {
dev_err(lmk->dev, "failed to init device clock path\n");
goto err_disable_oscin;
}
if (lmk->vco_rate) {
dev_info(lmk->dev, "setting VCO rate to %u Hz\n", lmk->vco_rate);
ret = clk_set_rate(lmk->vco.clk, lmk->vco_rate);
if (ret) {
dev_err(lmk->dev, "failed to set VCO rate\n");
goto err_disable_vco;
}
}
ret = lmk04832_register_sclk(lmk);
if (ret) {
dev_err(lmk->dev, "failed to init SYNC/SYSREF clock path\n");
goto err_disable_vco;
}
for (i = 0; i < info->num_channels; i++) {
ret = lmk04832_register_clkout(lmk, i);
if (ret) {
dev_err(lmk->dev, "failed to register clk %d\n", i);
goto err_disable_vco;
}
}
lmk->clk_data->num = info->num_channels;
ret = devm_of_clk_add_hw_provider(lmk->dev, of_clk_hw_onecell_get,
lmk->clk_data);
if (ret) {
dev_err(lmk->dev, "failed to add provider (%d)\n", ret);
goto err_disable_vco;
}
spi_set_drvdata(spi, lmk);
return 0;
err_disable_vco:
clk_disable_unprepare(lmk->vco.clk);
err_disable_oscin:
clk_disable_unprepare(lmk->oscin);
return ret;
}
static void lmk04832_remove(struct spi_device *spi)
{
struct lmk04832 *lmk = spi_get_drvdata(spi);
clk_disable_unprepare(lmk->oscin);
}
static const struct spi_device_id lmk04832_id[] = {
{ "lmk04832", LMK04832 },
{}
};
MODULE_DEVICE_TABLE(spi, lmk04832_id);
static const struct of_device_id lmk04832_of_id[] = {
{ .compatible = "ti,lmk04832" },
{}
};
MODULE_DEVICE_TABLE(of, lmk04832_of_id);
static struct spi_driver lmk04832_driver = {
.driver = {
.name = "lmk04832",
.of_match_table = lmk04832_of_id,
},
.probe = lmk04832_probe,
.remove = lmk04832_remove,
.id_table = lmk04832_id,
};
module_spi_driver(lmk04832_driver);
MODULE_AUTHOR("Liam Beguin <lvb@xiphos.com>");
MODULE_DESCRIPTION("Texas Instruments LMK04832");
MODULE_LICENSE("GPL v2");
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