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mfd: arizona: Factor out SYSCLK enable from wm5102 hardware patch 

wm5102 applies a custom hardware boot sequence, for this the SYSCLK
needs to be enabled. This patch factors out the code that enables
SYSCLK for this sequence such that it can be used for other boot time
operations that require SYSCLK.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Charles Keepax 2015-05-11 13:58:05 +01:00 committed by Lee Jones
parent 0be068a077
commit 3850e3ee86
1 changed files with 57 additions and 20 deletions
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77
drivers/mfd/arizona-core.c
View File

@ -264,19 +264,25 @@ static void arizona_disable_reset(struct arizona *arizona)
}
}
static int wm5102_apply_hardware_patch(struct arizona *arizona)
struct arizona_sysclk_state {
unsigned int fll;
unsigned int sysclk;
};
static int arizona_enable_freerun_sysclk(struct arizona *arizona,
struct arizona_sysclk_state *state)
{
unsigned int fll, sysclk;
int ret, err;
/* Cache existing FLL and SYSCLK settings */
ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &fll);
ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &state->fll);
if (ret) {
dev_err(arizona->dev, "Failed to cache FLL settings: %d\n",
ret);
return ret;
}
ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, &sysclk);
ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1,
&state->sysclk);
if (ret) {
dev_err(arizona->dev, "Failed to cache SYSCLK settings: %d\n",
ret);
@ -306,14 +312,58 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
goto err_fll;
}
return 0;
err_fll:
err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll);
if (err)
dev_err(arizona->dev,
"Failed to re-apply old FLL settings: %d\n", err);
return ret;
}
static int arizona_disable_freerun_sysclk(struct arizona *arizona,
struct arizona_sysclk_state *state)
{
int ret;
ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1,
state->sysclk);
if (ret) {
dev_err(arizona->dev,
"Failed to re-apply old SYSCLK settings: %d\n", ret);
return ret;
}
ret = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, state->fll);
if (ret) {
dev_err(arizona->dev,
"Failed to re-apply old FLL settings: %d\n", ret);
return ret;
}
return 0;
}
static int wm5102_apply_hardware_patch(struct arizona *arizona)
{
struct arizona_sysclk_state state;
int err, ret;
ret = arizona_enable_freerun_sysclk(arizona, &state);
if (ret)
return ret;
/* Start the write sequencer and wait for it to finish */
ret = regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
ARIZONA_WSEQ_ENA | ARIZONA_WSEQ_START | 160);
if (ret) {
dev_err(arizona->dev, "Failed to start write sequencer: %d\n",
ret);
goto err_sysclk;
goto err;
}
ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
ARIZONA_WSEQ_BUSY, 0);
if (ret) {
@ -322,21 +372,8 @@ static int wm5102_apply_hardware_patch(struct arizona *arizona)
ret = -ETIMEDOUT;
}
err_sysclk:
err = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, sysclk);
if (err) {
dev_err(arizona->dev,
"Failed to re-apply old SYSCLK settings: %d\n",
err);
}
err_fll:
err = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, fll);
if (err) {
dev_err(arizona->dev,
"Failed to re-apply old FLL settings: %d\n",
err);
}
err:
err = arizona_disable_freerun_sysclk(arizona, &state);
return ret ?: err;
}