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authorAndreas Färber <afaerber@suse.de>2018-10-05 09:58:11 +0200
committerMark Brown <broonie@kernel.org>2018-10-08 20:46:15 +0200
commit62a7fc32a6289dce88787da03f893deab08158c3 (patch)
tree437843b91a7d6d9cb41a63a94f4607cbb8258e50 /sound
parentASoC: dt-bindings: max98088: add external clock binding (diff)
downloadlinux-62a7fc32a6289dce88787da03f893deab08158c3.tar.xz
linux-62a7fc32a6289dce88787da03f893deab08158c3.zip
ASoC: max98088: Add master clock handling
If master clock is provided through device tree, then update the master clock frequency during set_sysclk. Cc: Tushar Behera <tushar.behera@linaro.org> Signed-off-by: Andreas Färber <afaerber@suse.de> Acked-by: Tushar Behera <trblinux@gmail.com> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> [m.felsch@pengutronix.de: move mclk request to i2c_probe] [m.felsch@pengutronix.de: make use of snd_soc_component_get_bias_level()] Signed-off-by: Marco Felsch <m.felsch@pengutronix.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/max98088.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
index 9450d5d9c492..ca172a4b6849 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -16,6 +16,7 @@
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
+#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@@ -42,6 +43,7 @@ struct max98088_priv {
struct regmap *regmap;
enum max98088_type devtype;
struct max98088_pdata *pdata;
+ struct clk *mclk;
unsigned int sysclk;
struct max98088_cdata dai[2];
int eq_textcnt;
@@ -1103,6 +1105,11 @@ static int max98088_dai_set_sysclk(struct snd_soc_dai *dai,
if (freq == max98088->sysclk)
return 0;
+ if (!IS_ERR(max98088->mclk)) {
+ freq = clk_round_rate(max98088->mclk, freq);
+ clk_set_rate(max98088->mclk, freq);
+ }
+
/* Setup clocks for slave mode, and using the PLL
* PSCLK = 0x01 (when master clk is 10MHz to 20MHz)
* 0x02 (when master clk is 20MHz to 30MHz)..
@@ -1310,6 +1317,20 @@ static int max98088_set_bias_level(struct snd_soc_component *component,
break;
case SND_SOC_BIAS_PREPARE:
+ /*
+ * SND_SOC_BIAS_PREPARE is called while preparing for a
+ * transition to ON or away from ON. If current bias_level
+ * is SND_SOC_BIAS_ON, then it is preparing for a transition
+ * away from ON. Disable the clock in that case, otherwise
+ * enable it.
+ */
+ if (!IS_ERR(max98088->mclk)) {
+ if (snd_soc_component_get_bias_level(component) ==
+ SND_SOC_BIAS_ON)
+ clk_disable_unprepare(max98088->mclk);
+ else
+ clk_prepare_enable(max98088->mclk);
+ }
break;
case SND_SOC_BIAS_STANDBY:
@@ -1725,6 +1746,11 @@ static int max98088_i2c_probe(struct i2c_client *i2c,
if (IS_ERR(max98088->regmap))
return PTR_ERR(max98088->regmap);
+ max98088->mclk = devm_clk_get(&i2c->dev, "mclk");
+ if (IS_ERR(max98088->mclk))
+ if (PTR_ERR(max98088->mclk) == -EPROBE_DEFER)
+ return PTR_ERR(max98088->mclk);
+
max98088->devtype = id->driver_data;
i2c_set_clientdata(i2c, max98088);