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clk: sunxi-ng: mux: Allow muxes to have keys

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The muxes in the RTC can only be updated when setting a key field to a
specific value. Add a feature flag to denote muxes with this property.

Since so far the key value is always the same, it does not need to be
provided separately for each mux.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220203021736.13434-5-samuel@sholland.org
This commit is contained in:
Samuel Holland 2022-02-02 20:17:34 -06:00 committed by Alexandre Belloni
parent 43f0269b6b
commit 7fc46339c3
2 changed files with 8 additions and 0 deletions
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1
drivers/clk/sunxi-ng/ccu_common.h
View File

@ -17,6 +17,7 @@
#define CCU_FEATURE_LOCK_REG BIT(5)
#define CCU_FEATURE_MMC_TIMING_SWITCH BIT(6)
#define CCU_FEATURE_SIGMA_DELTA_MOD BIT(7)
#define CCU_FEATURE_KEY_FIELD BIT(8)
/* MMC timing mode switch bit */
#define CCU_MMC_NEW_TIMING_MODE BIT(30)

7
drivers/clk/sunxi-ng/ccu_mux.c
View File

@ -12,6 +12,8 @@
#include "ccu_gate.h"
#include "ccu_mux.h"
#define CCU_MUX_KEY_VALUE 0x16aa0000
static u16 ccu_mux_get_prediv(struct ccu_common *common,
struct ccu_mux_internal *cm,
int parent_index)
@ -191,6 +193,11 @@ int ccu_mux_helper_set_parent(struct ccu_common *common,
spin_lock_irqsave(common->lock, flags);
reg = readl(common->base + common->reg);
/* The key field always reads as zero. */
if (common->features & CCU_FEATURE_KEY_FIELD)
reg |= CCU_MUX_KEY_VALUE;
reg &= ~GENMASK(cm->width + cm->shift - 1, cm->shift);
writel(reg | (index << cm->shift), common->base + common->reg);