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linux/drivers/iio/frequency/adf4377.c
Antoniu Miclaus eda549e2e5 iio: frequency: adf4377: add support for ADF4377 
The ADF4377 is a high performance, ultralow jitter, dual output integer-N
phased locked loop (PLL) with integrated voltage controlled oscillator
(VCO) ideally suited for data converter and mixed signal front end (MxFE)
clock applications.

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adf4377.pdf
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20221115110041.71495-2-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2022-11-23 21:05:51 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* ADF4377 driver
*
* Copyright 2022 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/property.h>
#include <linux/spi/spi.h>
#include <linux/iio/iio.h>
#include <linux/regmap.h>
#include <linux/units.h>
#include <asm/unaligned.h>
/* ADF4377 REG0000 Map */
#define ADF4377_0000_SOFT_RESET_R_MSK BIT(7)
#define ADF4377_0000_LSB_FIRST_R_MSK BIT(6)
#define ADF4377_0000_ADDRESS_ASC_R_MSK BIT(5)
#define ADF4377_0000_SDO_ACTIVE_R_MSK BIT(4)
#define ADF4377_0000_SDO_ACTIVE_MSK BIT(3)
#define ADF4377_0000_ADDRESS_ASC_MSK BIT(2)
#define ADF4377_0000_LSB_FIRST_MSK BIT(1)
#define ADF4377_0000_SOFT_RESET_MSK BIT(0)
/* ADF4377 REG0000 Bit Definition */
#define ADF4377_0000_SDO_ACTIVE_SPI_3W 0x0
#define ADF4377_0000_SDO_ACTIVE_SPI_4W 0x1
#define ADF4377_0000_ADDR_ASC_AUTO_DECR 0x0
#define ADF4377_0000_ADDR_ASC_AUTO_INCR 0x1
#define ADF4377_0000_LSB_FIRST_MSB 0x0
#define ADF4377_0000_LSB_FIRST_LSB 0x1
#define ADF4377_0000_SOFT_RESET_N_OP 0x0
#define ADF4377_0000_SOFT_RESET_EN 0x1
/* ADF4377 REG0001 Map */
#define ADF4377_0001_SINGLE_INSTR_MSK BIT(7)
#define ADF4377_0001_MASTER_RB_CTRL_MSK BIT(5)
/* ADF4377 REG0003 Bit Definition */
#define ADF4377_0003_CHIP_TYPE 0x06
/* ADF4377 REG0004 Bit Definition */
#define ADF4377_0004_PRODUCT_ID_LSB 0x0005
/* ADF4377 REG0005 Bit Definition */
#define ADF4377_0005_PRODUCT_ID_MSB 0x0005
/* ADF4377 REG000A Map */
#define ADF4377_000A_SCRATCHPAD_MSK GENMASK(7, 0)
/* ADF4377 REG000C Bit Definition */
#define ADF4377_000C_VENDOR_ID_LSB 0x56
/* ADF4377 REG000D Bit Definition */
#define ADF4377_000D_VENDOR_ID_MSB 0x04
/* ADF4377 REG000F Bit Definition */
#define ADF4377_000F_R00F_RSV1_MSK GENMASK(7, 0)
/* ADF4377 REG0010 Map*/
#define ADF4377_0010_N_INT_LSB_MSK GENMASK(7, 0)
/* ADF4377 REG0011 Map*/
#define ADF4377_0011_EN_AUTOCAL_MSK BIT(7)
#define ADF4377_0011_EN_RDBLR_MSK BIT(6)
#define ADF4377_0011_DCLK_DIV2_MSK GENMASK(5, 4)
#define ADF4377_0011_N_INT_MSB_MSK GENMASK(3, 0)
/* ADF4377 REG0011 Bit Definition */
#define ADF4377_0011_DCLK_DIV2_1 0x0
#define ADF4377_0011_DCLK_DIV2_2 0x1
#define ADF4377_0011_DCLK_DIV2_4 0x2
#define ADF4377_0011_DCLK_DIV2_8 0x3
/* ADF4377 REG0012 Map*/
#define ADF4377_0012_CLKOUT_DIV_MSK GENMASK(7, 6)
#define ADF4377_0012_R_DIV_MSK GENMASK(5, 0)
/* ADF4377 REG0012 Bit Definition */
#define ADF4377_0012_CLKOUT_DIV_1 0x0
#define ADF4377_0012_CLKOUT_DIV_2 0x1
#define ADF4377_0012_CLKOUT_DIV_4 0x2
#define ADF4377_0012_CLKOUT_DIV_8 0x3
/* ADF4377 REG0013 Map */
#define ADF4377_0013_M_VCO_CORE_MSK GENMASK(5, 4)
#define ADF4377_0013_VCO_BIAS_MSK GENMASK(3, 0)
/* ADF4377 REG0013 Bit Definition */
#define ADF4377_0013_M_VCO_0 0x0
#define ADF4377_0013_M_VCO_1 0x1
#define ADF4377_0013_M_VCO_2 0x2
#define ADF4377_0013_M_VCO_3 0x3
/* ADF4377 REG0014 Map */
#define ADF4377_0014_M_VCO_BAND_MSK GENMASK(7, 0)
/* ADF4377 REG0015 Map */
#define ADF4377_0015_BLEED_I_LSB_MSK GENMASK(7, 6)
#define ADF4377_0015_BLEED_POL_MSK BIT(5)
#define ADF4377_0015_EN_BLEED_MSK BIT(4)
#define ADF4377_0015_CP_I_MSK GENMASK(3, 0)
/* ADF4377 REG0015 Bit Definition */
#define ADF4377_CURRENT_SINK 0x0
#define ADF4377_CURRENT_SOURCE 0x1
#define ADF4377_0015_CP_0MA7 0x0
#define ADF4377_0015_CP_0MA9 0x1
#define ADF4377_0015_CP_1MA1 0x2
#define ADF4377_0015_CP_1MA3 0x3
#define ADF4377_0015_CP_1MA4 0x4
#define ADF4377_0015_CP_1MA8 0x5
#define ADF4377_0015_CP_2MA2 0x6
#define ADF4377_0015_CP_2MA5 0x7
#define ADF4377_0015_CP_2MA9 0x8
#define ADF4377_0015_CP_3MA6 0x9
#define ADF4377_0015_CP_4MA3 0xA
#define ADF4377_0015_CP_5MA0 0xB
#define ADF4377_0015_CP_5MA7 0xC
#define ADF4377_0015_CP_7MA2 0xD
#define ADF4377_0015_CP_8MA6 0xE
#define ADF4377_0015_CP_10MA1 0xF
/* ADF4377 REG0016 Map */
#define ADF4377_0016_BLEED_I_MSB_MSK GENMASK(7, 0)
/* ADF4377 REG0017 Map */
#define ADF4377_0016_INV_CLKOUT_MSK BIT(7)
#define ADF4377_0016_N_DEL_MSK GENMASK(6, 0)
/* ADF4377 REG0018 Map */
#define ADF4377_0018_CMOS_OV_MSK BIT(7)
#define ADF4377_0018_R_DEL_MSK GENMASK(6, 0)
/* ADF4377 REG0018 Bit Definition */
#define ADF4377_0018_1V8_LOGIC 0x0
#define ADF4377_0018_3V3_LOGIC 0x1
/* ADF4377 REG0019 Map */
#define ADF4377_0019_CLKOUT2_OP_MSK GENMASK(7, 6)
#define ADF4377_0019_CLKOUT1_OP_MSK GENMASK(5, 4)
#define ADF4377_0019_PD_CLK_MSK BIT(3)
#define ADF4377_0019_PD_RDET_MSK BIT(2)
#define ADF4377_0019_PD_ADC_MSK BIT(1)
#define ADF4377_0019_PD_CALADC_MSK BIT(0)
/* ADF4377 REG0019 Bit Definition */
#define ADF4377_0019_CLKOUT_320MV 0x0
#define ADF4377_0019_CLKOUT_420MV 0x1
#define ADF4377_0019_CLKOUT_530MV 0x2
#define ADF4377_0019_CLKOUT_640MV 0x3
/* ADF4377 REG001A Map */
#define ADF4377_001A_PD_ALL_MSK BIT(7)
#define ADF4377_001A_PD_RDIV_MSK BIT(6)
#define ADF4377_001A_PD_NDIV_MSK BIT(5)
#define ADF4377_001A_PD_VCO_MSK BIT(4)
#define ADF4377_001A_PD_LD_MSK BIT(3)
#define ADF4377_001A_PD_PFDCP_MSK BIT(2)
#define ADF4377_001A_PD_CLKOUT1_MSK BIT(1)
#define ADF4377_001A_PD_CLKOUT2_MSK BIT(0)
/* ADF4377 REG001B Map */
#define ADF4377_001B_EN_LOL_MSK BIT(7)
#define ADF4377_001B_LDWIN_PW_MSK BIT(6)
#define ADF4377_001B_EN_LDWIN_MSK BIT(5)
#define ADF4377_001B_LD_COUNT_MSK GENMASK(4, 0)
/* ADF4377 REG001B Bit Definition */
#define ADF4377_001B_LDWIN_PW_NARROW 0x0
#define ADF4377_001B_LDWIN_PW_WIDE 0x1
/* ADF4377 REG001C Map */
#define ADF4377_001C_EN_DNCLK_MSK BIT(7)
#define ADF4377_001C_EN_DRCLK_MSK BIT(6)
#define ADF4377_001C_RST_LD_MSK BIT(2)
#define ADF4377_001C_R01C_RSV1_MSK BIT(0)
/* ADF4377 REG001C Bit Definition */
#define ADF4377_001C_RST_LD_INACTIVE 0x0
#define ADF4377_001C_RST_LD_ACTIVE 0x1
#define ADF4377_001C_R01C_RSV1 0x1
/* ADF4377 REG001D Map */
#define ADF4377_001D_MUXOUT_MSK GENMASK(7, 4)
#define ADF4377_001D_EN_CPTEST_MSK BIT(2)
#define ADF4377_001D_CP_DOWN_MSK BIT(1)
#define ADF4377_001D_CP_UP_MSK BIT(0)
#define ADF4377_001D_EN_CPTEST_OFF 0x0
#define ADF4377_001D_EN_CPTEST_ON 0x1
#define ADF4377_001D_CP_DOWN_OFF 0x0
#define ADF4377_001D_CP_DOWN_ON 0x1
#define ADF4377_001D_CP_UP_OFF 0x0
#define ADF4377_001D_CP_UP_ON 0x1
/* ADF4377 REG001F Map */
#define ADF4377_001F_BST_REF_MSK BIT(7)
#define ADF4377_001F_FILT_REF_MSK BIT(6)
#define ADF4377_001F_REF_SEL_MSK BIT(5)
#define ADF4377_001F_R01F_RSV1_MSK GENMASK(4, 0)
/* ADF4377 REG001F Bit Definition */
#define ADF4377_001F_BST_LARGE_REF_IN 0x0
#define ADF4377_001F_BST_SMALL_REF_IN 0x1
#define ADF4377_001F_FILT_REF_OFF 0x0
#define ADF4377_001F_FILT_REF_ON 0x1
#define ADF4377_001F_REF_SEL_DMA 0x0
#define ADF4377_001F_REF_SEL_LNA 0x1
#define ADF4377_001F_R01F_RSV1 0x7
/* ADF4377 REG0020 Map */
#define ADF4377_0020_RST_SYS_MSK BIT(4)
#define ADF4377_0020_EN_ADC_CLK_MSK BIT(3)
#define ADF4377_0020_R020_RSV1_MSK BIT(0)
/* ADF4377 REG0021 Bit Definition */
#define ADF4377_0021_R021_RSV1 0xD3
/* ADF4377 REG0022 Bit Definition */
#define ADF4377_0022_R022_RSV1 0x32
/* ADF4377 REG0023 Map */
#define ADF4377_0023_CAT_CT_SEL BIT(7)
#define ADF4377_0023_R023_RSV1_MSK GENMASK(6, 0)
/* ADF4377 REG0023 Bit Definition */
#define ADF4377_0023_R023_RSV1 0x18
/* ADF4377 REG0024 Map */
#define ADF4377_0024_DCLK_MODE_MSK BIT(2)
/* ADF4377 REG0025 Map */
#define ADF4377_0025_CLKODIV_DB_MSK BIT(7)
#define ADF4377_0025_DCLK_DB_MSK BIT(6)
#define ADF4377_0025_R025_RSV1_MSK GENMASK(5, 0)
/* ADF4377 REG0025 Bit Definition */
#define ADF4377_0025_R025_RSV1 0x16
/* ADF4377 REG0026 Map */
#define ADF4377_0026_VCO_BAND_DIV_MSK GENMASK(7, 0)
/* ADF4377 REG0027 Map */
#define ADF4377_0027_SYNTH_LOCK_TO_LSB_MSK GENMASK(7, 0)
/* ADF4377 REG0028 Map */
#define ADF4377_0028_O_VCO_DB_MSK BIT(7)
#define ADF4377_0028_SYNTH_LOCK_TO_MSB_MSK GENMASK(6, 0)
/* ADF4377 REG0029 Map */
#define ADF4377_0029_VCO_ALC_TO_LSB_MSK GENMASK(7, 0)
/* ADF4377 REG002A Map */
#define ADF4377_002A_DEL_CTRL_DB_MSK BIT(7)
#define ADF4377_002A_VCO_ALC_TO_MSB_MSK GENMASK(6, 0)
/* ADF4377 REG002C Map */
#define ADF4377_002C_R02C_RSV1 0xC0
/* ADF4377 REG002D Map */
#define ADF4377_002D_ADC_CLK_DIV_MSK GENMASK(7, 0)
/* ADF4377 REG002E Map */
#define ADF4377_002E_EN_ADC_CNV_MSK BIT(7)
#define ADF4377_002E_EN_ADC_MSK BIT(1)
#define ADF4377_002E_ADC_A_CONV_MSK BIT(0)
/* ADF4377 REG002E Bit Definition */
#define ADF4377_002E_ADC_A_CONV_ADC_ST_CNV 0x0
#define ADF4377_002E_ADC_A_CONV_VCO_CALIB 0x1
/* ADF4377 REG002F Map */
#define ADF4377_002F_DCLK_DIV1_MSK GENMASK(1, 0)
/* ADF4377 REG002F Bit Definition */
#define ADF4377_002F_DCLK_DIV1_1 0x0
#define ADF4377_002F_DCLK_DIV1_2 0x1
#define ADF4377_002F_DCLK_DIV1_8 0x2
#define ADF4377_002F_DCLK_DIV1_32 0x3
/* ADF4377 REG0031 Bit Definition */
#define ADF4377_0031_R031_RSV1 0x09
/* ADF4377 REG0032 Map */
#define ADF4377_0032_ADC_CLK_SEL_MSK BIT(6)
#define ADF4377_0032_R032_RSV1_MSK GENMASK(5, 0)
/* ADF4377 REG0032 Bit Definition */
#define ADF4377_0032_ADC_CLK_SEL_N_OP 0x0
#define ADF4377_0032_ADC_CLK_SEL_SPI_CLK 0x1
#define ADF4377_0032_R032_RSV1 0x9
/* ADF4377 REG0033 Bit Definition */
#define ADF4377_0033_R033_RSV1 0x18
/* ADF4377 REG0034 Bit Definition */
#define ADF4377_0034_R034_RSV1 0x08
/* ADF4377 REG003A Bit Definition */
#define ADF4377_003A_R03A_RSV1 0x5D
/* ADF4377 REG003B Bit Definition */
#define ADF4377_003B_R03B_RSV1 0x2B
/* ADF4377 REG003D Map */
#define ADF4377_003D_O_VCO_BAND_MSK BIT(3)
#define ADF4377_003D_O_VCO_CORE_MSK BIT(2)
#define ADF4377_003D_O_VCO_BIAS_MSK BIT(1)
/* ADF4377 REG003D Bit Definition */
#define ADF4377_003D_O_VCO_BAND_VCO_CALIB 0x0
#define ADF4377_003D_O_VCO_BAND_M_VCO 0x1
#define ADF4377_003D_O_VCO_CORE_VCO_CALIB 0x0
#define ADF4377_003D_O_VCO_CORE_M_VCO 0x1
#define ADF4377_003D_O_VCO_BIAS_VCO_CALIB 0x0
#define ADF4377_003D_O_VCO_BIAS_M_VCO 0x1
/* ADF4377 REG0042 Map */
#define ADF4377_0042_R042_RSV1 0x05
/* ADF4377 REG0045 Map */
#define ADF4377_0045_ADC_ST_CNV_MSK BIT(0)
/* ADF4377 REG0049 Map */
#define ADF4377_0049_EN_CLK2_MSK BIT(7)
#define ADF4377_0049_EN_CLK1_MSK BIT(6)
#define ADF4377_0049_REF_OK_MSK BIT(3)
#define ADF4377_0049_ADC_BUSY_MSK BIT(2)
#define ADF4377_0049_FSM_BUSY_MSK BIT(1)
#define ADF4377_0049_LOCKED_MSK BIT(0)
/* ADF4377 REG004B Map */
#define ADF4377_004B_VCO_CORE_MSK GENMASK(1, 0)
/* ADF4377 REG004C Map */
#define ADF4377_004C_CHIP_TEMP_LSB_MSK GENMASK(7, 0)
/* ADF4377 REG004D Map */
#define ADF4377_004D_CHIP_TEMP_MSB_MSK BIT(0)
/* ADF4377 REG004F Map */
#define ADF4377_004F_VCO_BAND_MSK GENMASK(7, 0)
/* ADF4377 REG0051 Map */
#define ADF4377_0051_VCO_BIAS_MSK GENMASK(3, 0)
/* ADF4377 REG0054 Map */
#define ADF4377_0054_CHIP_VERSION_MSK GENMASK(7, 0)
/* Specifications */
#define ADF4377_SPI_READ_CMD BIT(7)
#define ADF4377_MAX_VCO_FREQ (12800ULL * HZ_PER_MHZ)
#define ADF4377_MIN_VCO_FREQ (6400ULL * HZ_PER_MHZ)
#define ADF4377_MAX_REFIN_FREQ (1000 * HZ_PER_MHZ)
#define ADF4377_MIN_REFIN_FREQ (10 * HZ_PER_MHZ)
#define ADF4377_MAX_FREQ_PFD (500 * HZ_PER_MHZ)
#define ADF4377_MIN_FREQ_PFD (3 * HZ_PER_MHZ)
#define ADF4377_MAX_CLKPN_FREQ ADF4377_MAX_VCO_FREQ
#define ADF4377_MIN_CLKPN_FREQ (ADF4377_MIN_VCO_FREQ / 8)
#define ADF4377_FREQ_PFD_80MHZ (80 * HZ_PER_MHZ)
#define ADF4377_FREQ_PFD_125MHZ (125 * HZ_PER_MHZ)
#define ADF4377_FREQ_PFD_160MHZ (160 * HZ_PER_MHZ)
#define ADF4377_FREQ_PFD_250MHZ (250 * HZ_PER_MHZ)
#define ADF4377_FREQ_PFD_320MHZ (320 * HZ_PER_MHZ)
enum {
ADF4377_FREQ,
};
enum muxout_select_mode {
ADF4377_MUXOUT_HIGH_Z = 0x0,
ADF4377_MUXOUT_LKDET = 0x1,
ADF4377_MUXOUT_LOW = 0x2,
ADF4377_MUXOUT_DIV_RCLK_2 = 0x4,
ADF4377_MUXOUT_DIV_NCLK_2 = 0x5,
ADF4377_MUXOUT_HIGH = 0x8,
};
struct adf4377_state {
struct spi_device *spi;
struct regmap *regmap;
struct clk *clkin;
/* Protect against concurrent accesses to the device and data content */
struct mutex lock;
struct notifier_block nb;
/* Reference Divider */
unsigned int ref_div_factor;
/* PFD Frequency */
unsigned int f_pfd;
/* Input Reference Clock */
unsigned int clkin_freq;
/* CLKOUT Divider */
u8 clkout_div_sel;
/* Feedback Divider (N) */
u16 n_int;
u16 synth_lock_timeout;
u16 vco_alc_timeout;
u16 adc_clk_div;
u16 vco_band_div;
u8 dclk_div1;
u8 dclk_div2;
u8 dclk_mode;
unsigned int f_div_rclk;
enum muxout_select_mode muxout_select;
struct gpio_desc *gpio_ce;
struct gpio_desc *gpio_enclk1;
struct gpio_desc *gpio_enclk2;
u8 buf[2] __aligned(IIO_DMA_MINALIGN);
};
static const char * const adf4377_muxout_modes[] = {
[ADF4377_MUXOUT_HIGH_Z] = "high_z",
[ADF4377_MUXOUT_LKDET] = "lock_detect",
[ADF4377_MUXOUT_LOW] = "muxout_low",
[ADF4377_MUXOUT_DIV_RCLK_2] = "f_div_rclk_2",
[ADF4377_MUXOUT_DIV_NCLK_2] = "f_div_nclk_2",
[ADF4377_MUXOUT_HIGH] = "muxout_high",
};
static const struct reg_sequence adf4377_reg_defaults[] = {
{ 0x42, ADF4377_0042_R042_RSV1 },
{ 0x3B, ADF4377_003B_R03B_RSV1 },
{ 0x3A, ADF4377_003A_R03A_RSV1 },
{ 0x34, ADF4377_0034_R034_RSV1 },
{ 0x33, ADF4377_0033_R033_RSV1 },
{ 0x32, ADF4377_0032_R032_RSV1 },
{ 0x31, ADF4377_0031_R031_RSV1 },
{ 0x2C, ADF4377_002C_R02C_RSV1 },
{ 0x25, ADF4377_0025_R025_RSV1 },
{ 0x23, ADF4377_0023_R023_RSV1 },
{ 0x22, ADF4377_0022_R022_RSV1 },
{ 0x21, ADF4377_0021_R021_RSV1 },
{ 0x1f, ADF4377_001F_R01F_RSV1 },
{ 0x1c, ADF4377_001C_R01C_RSV1 },
};
static const struct regmap_config adf4377_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.read_flag_mask = BIT(7),
.max_register = 0x54,
};
static int adf4377_reg_access(struct iio_dev *indio_dev,
unsigned int reg,
unsigned int write_val,
unsigned int *read_val)
{
struct adf4377_state *st = iio_priv(indio_dev);
if (read_val)
return regmap_read(st->regmap, reg, read_val);
return regmap_write(st->regmap, reg, write_val);
}
static const struct iio_info adf4377_info = {
.debugfs_reg_access = &adf4377_reg_access,
};
static int adf4377_soft_reset(struct adf4377_state *st)
{
unsigned int read_val;
int ret;
ret = regmap_update_bits(st->regmap, 0x0, ADF4377_0000_SOFT_RESET_MSK |
ADF4377_0000_SOFT_RESET_R_MSK,
FIELD_PREP(ADF4377_0000_SOFT_RESET_MSK, 1) |
FIELD_PREP(ADF4377_0000_SOFT_RESET_R_MSK, 1));
if (ret)
return ret;
return regmap_read_poll_timeout(st->regmap, 0x0, read_val,
!(read_val & (ADF4377_0000_SOFT_RESET_R_MSK |
ADF4377_0000_SOFT_RESET_R_MSK)), 200, 200 * 100);
}
static int adf4377_get_freq(struct adf4377_state *st, u64 *freq)
{
unsigned int ref_div_factor, n_int;
u64 clkin_freq;
int ret;
mutex_lock(&st->lock);
ret = regmap_read(st->regmap, 0x12, &ref_div_factor);
if (ret)
goto exit;
ret = regmap_bulk_read(st->regmap, 0x10, st->buf, sizeof(st->buf));
if (ret)
goto exit;
clkin_freq = clk_get_rate(st->clkin);
ref_div_factor = FIELD_GET(ADF4377_0012_R_DIV_MSK, ref_div_factor);
n_int = FIELD_GET(ADF4377_0010_N_INT_LSB_MSK | ADF4377_0011_N_INT_MSB_MSK,
get_unaligned_le16(&st->buf));
*freq = div_u64(clkin_freq, ref_div_factor) * n_int;
exit:
mutex_unlock(&st->lock);
return ret;
}
static int adf4377_set_freq(struct adf4377_state *st, u64 freq)
{
unsigned int read_val;
u64 f_vco;
int ret;
mutex_lock(&st->lock);
if (freq > ADF4377_MAX_CLKPN_FREQ || freq < ADF4377_MIN_CLKPN_FREQ) {
ret = -EINVAL;
goto exit;
}
ret = regmap_update_bits(st->regmap, 0x1C, ADF4377_001C_EN_DNCLK_MSK |
ADF4377_001C_EN_DRCLK_MSK,
FIELD_PREP(ADF4377_001C_EN_DNCLK_MSK, 1) |
FIELD_PREP(ADF4377_001C_EN_DRCLK_MSK, 1));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x11, ADF4377_0011_EN_AUTOCAL_MSK |
ADF4377_0011_DCLK_DIV2_MSK,
FIELD_PREP(ADF4377_0011_EN_AUTOCAL_MSK, 1) |
FIELD_PREP(ADF4377_0011_DCLK_DIV2_MSK, st->dclk_div2));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x2E, ADF4377_002E_EN_ADC_CNV_MSK |
ADF4377_002E_EN_ADC_MSK |
ADF4377_002E_ADC_A_CONV_MSK,
FIELD_PREP(ADF4377_002E_EN_ADC_CNV_MSK, 1) |
FIELD_PREP(ADF4377_002E_EN_ADC_MSK, 1) |
FIELD_PREP(ADF4377_002E_ADC_A_CONV_MSK,
ADF4377_002E_ADC_A_CONV_VCO_CALIB));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x20, ADF4377_0020_EN_ADC_CLK_MSK,
FIELD_PREP(ADF4377_0020_EN_ADC_CLK_MSK, 1));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x2F, ADF4377_002F_DCLK_DIV1_MSK,
FIELD_PREP(ADF4377_002F_DCLK_DIV1_MSK, st->dclk_div1));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x24, ADF4377_0024_DCLK_MODE_MSK,
FIELD_PREP(ADF4377_0024_DCLK_MODE_MSK, st->dclk_mode));
if (ret)
goto exit;
ret = regmap_write(st->regmap, 0x27,
FIELD_PREP(ADF4377_0027_SYNTH_LOCK_TO_LSB_MSK,
st->synth_lock_timeout));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x28, ADF4377_0028_SYNTH_LOCK_TO_MSB_MSK,
FIELD_PREP(ADF4377_0028_SYNTH_LOCK_TO_MSB_MSK,
st->synth_lock_timeout >> 8));
if (ret)
goto exit;
ret = regmap_write(st->regmap, 0x29,
FIELD_PREP(ADF4377_0029_VCO_ALC_TO_LSB_MSK,
st->vco_alc_timeout));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x2A, ADF4377_002A_VCO_ALC_TO_MSB_MSK,
FIELD_PREP(ADF4377_002A_VCO_ALC_TO_MSB_MSK,
st->vco_alc_timeout >> 8));
if (ret)
goto exit;
ret = regmap_write(st->regmap, 0x26,
FIELD_PREP(ADF4377_0026_VCO_BAND_DIV_MSK, st->vco_band_div));
if (ret)
goto exit;
ret = regmap_write(st->regmap, 0x2D,
FIELD_PREP(ADF4377_002D_ADC_CLK_DIV_MSK, st->adc_clk_div));
if (ret)
goto exit;
st->clkout_div_sel = 0;
f_vco = freq;
while (f_vco < ADF4377_MIN_VCO_FREQ) {
f_vco <<= 1;
st->clkout_div_sel++;
}
st->n_int = div_u64(freq, st->f_pfd);
ret = regmap_update_bits(st->regmap, 0x11, ADF4377_0011_EN_RDBLR_MSK |
ADF4377_0011_N_INT_MSB_MSK,
FIELD_PREP(ADF4377_0011_EN_RDBLR_MSK, 0) |
FIELD_PREP(ADF4377_0011_N_INT_MSB_MSK, st->n_int >> 8));
if (ret)
goto exit;
ret = regmap_update_bits(st->regmap, 0x12, ADF4377_0012_R_DIV_MSK |
ADF4377_0012_CLKOUT_DIV_MSK,
FIELD_PREP(ADF4377_0012_CLKOUT_DIV_MSK, st->clkout_div_sel) |
FIELD_PREP(ADF4377_0012_R_DIV_MSK, st->ref_div_factor));
if (ret)
goto exit;
ret = regmap_write(st->regmap, 0x10,
FIELD_PREP(ADF4377_0010_N_INT_LSB_MSK, st->n_int));
if (ret)
goto exit;
ret = regmap_read_poll_timeout(st->regmap, 0x49, read_val,
!(read_val & (ADF4377_0049_FSM_BUSY_MSK)), 200, 200 * 100);
if (ret)
goto exit;
/* Disable EN_DNCLK, EN_DRCLK */
ret = regmap_update_bits(st->regmap, 0x1C, ADF4377_001C_EN_DNCLK_MSK |
ADF4377_001C_EN_DRCLK_MSK,
FIELD_PREP(ADF4377_001C_EN_DNCLK_MSK, 0) |
FIELD_PREP(ADF4377_001C_EN_DRCLK_MSK, 0));
if (ret)
goto exit;
/* Disable EN_ADC_CLK */
ret = regmap_update_bits(st->regmap, 0x20, ADF4377_0020_EN_ADC_CLK_MSK,
FIELD_PREP(ADF4377_0020_EN_ADC_CLK_MSK, 0));
if (ret)
goto exit;
/* Set output Amplitude */
ret = regmap_update_bits(st->regmap, 0x19, ADF4377_0019_CLKOUT2_OP_MSK |
ADF4377_0019_CLKOUT1_OP_MSK,
FIELD_PREP(ADF4377_0019_CLKOUT1_OP_MSK,
ADF4377_0019_CLKOUT_420MV) |
FIELD_PREP(ADF4377_0019_CLKOUT2_OP_MSK,
ADF4377_0019_CLKOUT_420MV));
exit:
mutex_unlock(&st->lock);
return ret;
}
static void adf4377_gpio_init(struct adf4377_state *st)
{
if (st->gpio_ce) {
gpiod_set_value(st->gpio_ce, 1);
/* Delay for SPI register bits to settle to their power-on reset state */
fsleep(200);
}
if (st->gpio_enclk1)
gpiod_set_value(st->gpio_enclk1, 1);
if (st->gpio_enclk2)
gpiod_set_value(st->gpio_enclk2, 1);
}
static int adf4377_init(struct adf4377_state *st)
{
struct spi_device *spi = st->spi;
int ret;
adf4377_gpio_init(st);
ret = adf4377_soft_reset(st);
if (ret) {
dev_err(&spi->dev, "Failed to soft reset.\n");
return ret;
}
ret = regmap_multi_reg_write(st->regmap, adf4377_reg_defaults,
ARRAY_SIZE(adf4377_reg_defaults));
if (ret) {
dev_err(&spi->dev, "Failed to set default registers.\n");
return ret;
}
ret = regmap_update_bits(st->regmap, 0x00,
ADF4377_0000_SDO_ACTIVE_MSK | ADF4377_0000_SDO_ACTIVE_R_MSK,
FIELD_PREP(ADF4377_0000_SDO_ACTIVE_MSK,
ADF4377_0000_SDO_ACTIVE_SPI_4W) |
FIELD_PREP(ADF4377_0000_SDO_ACTIVE_R_MSK,
ADF4377_0000_SDO_ACTIVE_SPI_4W));
if (ret) {
dev_err(&spi->dev, "Failed to set 4-Wire Operation.\n");
return ret;
}
st->clkin_freq = clk_get_rate(st->clkin);
/* Power Up */
ret = regmap_write(st->regmap, 0x1a,
FIELD_PREP(ADF4377_001A_PD_ALL_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_RDIV_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_NDIV_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_VCO_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_LD_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_PFDCP_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_CLKOUT1_MSK, 0) |
FIELD_PREP(ADF4377_001A_PD_CLKOUT2_MSK, 0));
if (ret) {
dev_err(&spi->dev, "Failed to set power down registers.\n");
return ret;
}
/* Set Mux Output */
ret = regmap_update_bits(st->regmap, 0x1D,
ADF4377_001D_MUXOUT_MSK,
FIELD_PREP(ADF4377_001D_MUXOUT_MSK, st->muxout_select));
if (ret)
return ret;
/* Compute PFD */
st->ref_div_factor = 0;
do {
st->ref_div_factor++;
st->f_pfd = st->clkin_freq / st->ref_div_factor;
} while (st->f_pfd > ADF4377_MAX_FREQ_PFD);
if (st->f_pfd > ADF4377_MAX_FREQ_PFD || st->f_pfd < ADF4377_MIN_FREQ_PFD)
return -EINVAL;
st->f_div_rclk = st->f_pfd;
if (st->f_pfd <= ADF4377_FREQ_PFD_80MHZ) {
st->dclk_div1 = ADF4377_002F_DCLK_DIV1_1;
st->dclk_div2 = ADF4377_0011_DCLK_DIV2_1;
st->dclk_mode = 0;
} else if (st->f_pfd <= ADF4377_FREQ_PFD_125MHZ) {
st->dclk_div1 = ADF4377_002F_DCLK_DIV1_1;
st->dclk_div2 = ADF4377_0011_DCLK_DIV2_1;
st->dclk_mode = 1;
} else if (st->f_pfd <= ADF4377_FREQ_PFD_160MHZ) {
st->dclk_div1 = ADF4377_002F_DCLK_DIV1_2;
st->dclk_div2 = ADF4377_0011_DCLK_DIV2_1;
st->dclk_mode = 0;
st->f_div_rclk /= 2;
} else if (st->f_pfd <= ADF4377_FREQ_PFD_250MHZ) {
st->dclk_div1 = ADF4377_002F_DCLK_DIV1_2;
st->dclk_div2 = ADF4377_0011_DCLK_DIV2_1;
st->dclk_mode = 1;
st->f_div_rclk /= 2;
} else if (st->f_pfd <= ADF4377_FREQ_PFD_320MHZ) {
st->dclk_div1 = ADF4377_002F_DCLK_DIV1_2;
st->dclk_div2 = ADF4377_0011_DCLK_DIV2_2;
st->dclk_mode = 0;
st->f_div_rclk /= 4;
} else {
st->dclk_div1 = ADF4377_002F_DCLK_DIV1_2;
st->dclk_div2 = ADF4377_0011_DCLK_DIV2_2;
st->dclk_mode = 1;
st->f_div_rclk /= 4;
}
st->synth_lock_timeout = DIV_ROUND_UP(st->f_div_rclk, 50000);
st->vco_alc_timeout = DIV_ROUND_UP(st->f_div_rclk, 20000);
st->vco_band_div = DIV_ROUND_UP(st->f_div_rclk, 150000 * 16 * (1 << st->dclk_mode));
st->adc_clk_div = DIV_ROUND_UP((st->f_div_rclk / 400000 - 2), 4);
return 0;
}
static ssize_t adf4377_read(struct iio_dev *indio_dev, uintptr_t private,
const struct iio_chan_spec *chan, char *buf)
{
struct adf4377_state *st = iio_priv(indio_dev);
u64 val = 0;
int ret;
switch ((u32)private) {
case ADF4377_FREQ:
ret = adf4377_get_freq(st, &val);
if (ret)
return ret;
return sysfs_emit(buf, "%llu\n", val);
default:
return -EINVAL;
}
}
static ssize_t adf4377_write(struct iio_dev *indio_dev, uintptr_t private,
const struct iio_chan_spec *chan, const char *buf,
size_t len)
{
struct adf4377_state *st = iio_priv(indio_dev);
unsigned long long freq;
int ret;
switch ((u32)private) {
case ADF4377_FREQ:
ret = kstrtoull(buf, 10, &freq);
if (ret)
return ret;
ret = adf4377_set_freq(st, freq);
if (ret)
return ret;
return len;
default:
return -EINVAL;
}
}
#define _ADF4377_EXT_INFO(_name, _shared, _ident) { \
.name = _name, \
.read = adf4377_read, \
.write = adf4377_write, \
.private = _ident, \
.shared = _shared, \
}
static const struct iio_chan_spec_ext_info adf4377_ext_info[] = {
/*
* Usually we use IIO_CHAN_INFO_FREQUENCY, but there are
* values > 2^32 in order to support the entire frequency range
* in Hz.
*/
_ADF4377_EXT_INFO("frequency", IIO_SEPARATE, ADF4377_FREQ),
{ }
};
static const struct iio_chan_spec adf4377_channels[] = {
{
.type = IIO_ALTVOLTAGE,
.indexed = 1,
.output = 1,
.channel = 0,
.ext_info = adf4377_ext_info,
},
};
static int adf4377_properties_parse(struct adf4377_state *st)
{
struct spi_device *spi = st->spi;
const char *str;
int ret;
st->clkin = devm_clk_get_enabled(&spi->dev, "ref_in");
if (IS_ERR(st->clkin))
return dev_err_probe(&spi->dev, PTR_ERR(st->clkin),
"failed to get the reference input clock\n");
st->gpio_ce = devm_gpiod_get_optional(&st->spi->dev, "chip-enable",
GPIOD_OUT_LOW);
if (IS_ERR(st->gpio_ce))
return dev_err_probe(&spi->dev, PTR_ERR(st->gpio_ce),
"failed to get the CE GPIO\n");
st->gpio_enclk1 = devm_gpiod_get_optional(&st->spi->dev, "clk1-enable",
GPIOD_OUT_LOW);
if (IS_ERR(st->gpio_enclk1))
return dev_err_probe(&spi->dev, PTR_ERR(st->gpio_enclk1),
"failed to get the CE GPIO\n");
st->gpio_enclk2 = devm_gpiod_get_optional(&st->spi->dev, "clk2-enable",
GPIOD_OUT_LOW);
if (IS_ERR(st->gpio_enclk2))
return dev_err_probe(&spi->dev, PTR_ERR(st->gpio_enclk2),
"failed to get the CE GPIO\n");
ret = device_property_read_string(&spi->dev, "adi,muxout-select", &str);
if (ret) {
st->muxout_select = ADF4377_MUXOUT_HIGH_Z;
} else {
ret = match_string(adf4377_muxout_modes, ARRAY_SIZE(adf4377_muxout_modes), str);
if (ret < 0)
return ret;
st->muxout_select = ret;
}
return 0;
}
static int adf4377_freq_change(struct notifier_block *nb, unsigned long action, void *data)
{
struct adf4377_state *st = container_of(nb, struct adf4377_state, nb);
int ret;
if (action == POST_RATE_CHANGE) {
mutex_lock(&st->lock);
ret = notifier_from_errno(adf4377_init(st));
mutex_unlock(&st->lock);
return ret;
}
return NOTIFY_OK;
}
static int adf4377_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct regmap *regmap;
struct adf4377_state *st;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
regmap = devm_regmap_init_spi(spi, &adf4377_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
st = iio_priv(indio_dev);
indio_dev->info = &adf4377_info;
indio_dev->name = "adf4377";
indio_dev->channels = adf4377_channels;
indio_dev->num_channels = ARRAY_SIZE(adf4377_channels);
st->regmap = regmap;
st->spi = spi;
mutex_init(&st->lock);
ret = adf4377_properties_parse(st);
if (ret)
return ret;
st->nb.notifier_call = adf4377_freq_change;
ret = devm_clk_notifier_register(&spi->dev, st->clkin, &st->nb);
if (ret)
return ret;
ret = adf4377_init(st);
if (ret)
return ret;
return devm_iio_device_register(&spi->dev, indio_dev);
}
static const struct spi_device_id adf4377_id[] = {
{ "adf4377", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, adf4377_id);
static const struct of_device_id adf4377_of_match[] = {
{ .compatible = "adi,adf4377" },
{}
};
MODULE_DEVICE_TABLE(of, adf4377_of_match);
static struct spi_driver adf4377_driver = {
.driver = {
.name = "adf4377",
.of_match_table = adf4377_of_match,
},
.probe = adf4377_probe,
.id_table = adf4377_id,
};
module_spi_driver(adf4377_driver);
MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com>");
MODULE_DESCRIPTION("Analog Devices ADF4377");
MODULE_LICENSE("GPL");
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