If master clock is provided through device tree, then update
the master clock frequency during set_sysclk.
Documentation has been updated to reflect the change.
Signed-off-by: Tushar Behera <tushar.beh...@linaro.org>
---
.../devicetree/bindings/sound/max98090.txt | 6 +++++
sound/soc/codecs/max98090.c | 23 ++++++++++++++++++++
sound/soc/codecs/max98090.h | 1 +
3 files changed, 30 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/max98090.txt
b/Documentation/devicetree/bindings/sound/max98090.txt
index e4c8b36..a5e63fa 100644
--- a/Documentation/devicetree/bindings/sound/max98090.txt
+++ b/Documentation/devicetree/bindings/sound/max98090.txt
@@ -10,6 +10,12 @@ Required properties:
- interrupts : The CODEC's interrupt output.
+Optional properties:
+
+- clocks: The phandle of the master clock to the CODEC
+
+- clock-names: Should be "mclk"
+
Pins on the device (for linking into audio routes):
* MIC1
diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index 9b76f5a..9275785 100644
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -17,6 +17,7 @@
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/acpi.h>
+#include <linux/clk.h>
#include <sound/jack.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@@ -1800,6 +1801,19 @@ static int max98090_set_bias_level(struct snd_soc_codec
*codec,
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(max98090->mclk)) {
+ if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
+ clk_disable_unprepare(max98090->mclk);
+ else
+ clk_prepare_enable(max98090->mclk);
+ }
break;
case SND_SOC_BIAS_STANDBY:
@@ -1929,6 +1943,11 @@ static int max98090_dai_set_sysclk(struct snd_soc_dai
*dai,
if (freq == max98090->sysclk)
return 0;
+ if (!IS_ERR(max98090->mclk)) {
+ freq = clk_round_rate(max98090->mclk, freq);
+ clk_set_rate(max98090->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 40MHz)..
@@ -2213,6 +2232,10 @@ static int max98090_probe(struct snd_soc_codec *codec)
dev_dbg(codec->dev, "max98090_probe\n");
+ max98090->mclk = devm_clk_get(codec->dev, "mclk");
+ if (PTR_ERR(max98090->mclk) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
max98090->codec = codec;
/* Reset the codec, the DSP core, and disable all interrupts */
diff --git a/sound/soc/codecs/max98090.h b/sound/soc/codecs/max98090.h
index 5a3c8d0..cf1b606 100644
--- a/sound/soc/codecs/max98090.h
+++ b/sound/soc/codecs/max98090.h
@@ -1524,6 +1524,7 @@ struct max98090_priv {
struct snd_soc_codec *codec;
enum max98090_type devtype;
struct max98090_pdata *pdata;
+ struct clk *mclk;
unsigned int sysclk;
unsigned int bclk;
unsigned int lrclk;
--
1.7.9.5
--
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