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authorSylwester Nawrocki2016-09-02 16:52:46 +0100
committerLee Jones2016-10-04 15:46:07 +0100
commitcdd8da8cc66b3d205120560649e530978ccbc567 (patch)
treed6a40397419b95800af04c7d768d02f2c1a6fc81 /drivers/mfd
parent29b4817d4018df78086157ea3a55c1d9424a7cfc (diff)
mfd: arizona: Add gating of external MCLKn clocks
This patch adds requesting of the clocks supplied on MCLK1, MCLK2 pins, gating of the 32k clock is added to the arizona_clk32k_enable(), arizona_clk32k_disable() helpers. It's a temporary change until the CODEC's clock controller gets exposed through the clk API and is helpful for board configurations where the MCLK clocks are not provided by always on oscillators. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/arizona-core.c30
1 files changed, 28 insertions, 2 deletions
diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index e4f97b3c824b..4fa0fae51006 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -10,6 +10,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
@@ -49,7 +50,15 @@ int arizona_clk32k_enable(struct arizona *arizona)
case ARIZONA_32KZ_MCLK1:
ret = pm_runtime_get_sync(arizona->dev);
if (ret != 0)
- goto out;
+ goto err_ref;
+ ret = clk_prepare_enable(arizona->mclk[ARIZONA_MCLK1]);
+ if (ret != 0)
+ goto err_pm;
+ break;
+ case ARIZONA_32KZ_MCLK2:
+ ret = clk_prepare_enable(arizona->mclk[ARIZONA_MCLK2]);
+ if (ret != 0)
+ goto err_ref;
break;
}
@@ -58,7 +67,9 @@ int arizona_clk32k_enable(struct arizona *arizona)
ARIZONA_CLK_32K_ENA);
}
-out:
+err_pm:
+ pm_runtime_put_sync(arizona->dev);
+err_ref:
if (ret != 0)
arizona->clk32k_ref--;
@@ -83,6 +94,10 @@ int arizona_clk32k_disable(struct arizona *arizona)
switch (arizona->pdata.clk32k_src) {
case ARIZONA_32KZ_MCLK1:
pm_runtime_put_sync(arizona->dev);
+ clk_disable_unprepare(arizona->mclk[ARIZONA_MCLK1]);
+ break;
+ case ARIZONA_32KZ_MCLK2:
+ clk_disable_unprepare(arizona->mclk[ARIZONA_MCLK2]);
break;
}
}
@@ -1000,6 +1015,7 @@ static const struct mfd_cell wm8998_devs[] = {
int arizona_dev_init(struct arizona *arizona)
{
+ const char * const mclk_name[] = { "mclk1", "mclk2" };
struct device *dev = arizona->dev;
const char *type_name = NULL;
unsigned int reg, val, mask;
@@ -1016,6 +1032,16 @@ int arizona_dev_init(struct arizona *arizona)
else
arizona_of_get_core_pdata(arizona);
+ BUILD_BUG_ON(ARRAY_SIZE(arizona->mclk) != ARRAY_SIZE(mclk_name));
+ for (i = 0; i < ARRAY_SIZE(arizona->mclk); i++) {
+ arizona->mclk[i] = devm_clk_get(arizona->dev, mclk_name[i]);
+ if (IS_ERR(arizona->mclk[i])) {
+ dev_info(arizona->dev, "Failed to get %s: %ld\n",
+ mclk_name[i], PTR_ERR(arizona->mclk[i]));
+ arizona->mclk[i] = NULL;
+ }
+ }
+
regcache_cache_only(arizona->regmap, true);
switch (arizona->type) {