Add support for a master clock passed through DT. The master clock of
the codec is only active when the codec is in use.
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Pawel Moll <pawel.moll@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
Cc: Kumar Gala <galak@xxxxxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/sound/tlv320aic32x4.txt | 4 ++++
sound/soc/codecs/tlv320aic32x4.c | 23 ++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt b/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt
index cff06ea..e90e6f0 100644
--- a/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt
+++ b/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt
@@ -8,6 +8,8 @@ Required properties:
Optional properties:
- gpio-reset: Reset-GPIO phandle with args as described in gpio/gpio.txt
+ - clocks/clock-names: Clock named 'mclk' for the master clock of the codec.
+ See clock/clock-bindings.txt for information about the detailed format.
Example:
@@ -15,4 +17,6 @@ Example:
codec: tlv320aic32x4@18 {
compatible = "ti,tlv320aic32x4";
reg = <0x18>;
+ clocks = <&clks 201>;
+ clock-names = "mclk";
};
diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c
index 6c38cb7..d7fa8dc 100644
--- a/sound/soc/codecs/tlv320aic32x4.c
+++ b/sound/soc/codecs/tlv320aic32x4.c
@@ -33,6 +33,7 @@
#include <linux/i2c.h>
#include <linux/cdev.h>
#include <linux/slab.h>
+#include <linux/clk.h>
#include <sound/tlv320aic32x4.h>
#include <sound/core.h>
@@ -67,6 +68,7 @@ struct aic32x4_priv {
u32 micpga_routing;
bool swapdacs;
int rstn_gpio;
+ struct clk *mclk;
};
/* 0dB min, 0.5dB steps */
@@ -487,8 +489,21 @@ static int aic32x4_mute(struct snd_soc_dai *dai, int mute)
static int aic32x4_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
+ struct aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec);
+
switch (level) {
case SND_SOC_BIAS_ON:
+ /* Switch on master clock */
+ if (!IS_ERR(aic32x4->mclk)) {
+ int ret;
+
+ ret = clk_prepare_enable(aic32x4->mclk);
+ if (ret) {
+ dev_err(codec->dev, "Failed to enable master clock\n");
+ return ret;
+ }
+ }
+
/* Switch on PLL */
snd_soc_update_bits(codec, AIC32X4_PLLPR,
AIC32X4_PLLEN, AIC32X4_PLLEN);
@@ -516,6 +531,10 @@ static int aic32x4_set_bias_level(struct snd_soc_codec *codec,
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
+ /* Switch off master clock */
+ if (!IS_ERR(aic32x4->mclk))
+ clk_disable_unprepare(aic32x4->mclk);
+
/* Switch off PLL */
snd_soc_update_bits(codec, AIC32X4_PLLPR,
AIC32X4_PLLEN, 0);
@@ -717,6 +736,10 @@ static int aic32x4_i2c_probe(struct i2c_client *i2c,
aic32x4->rstn_gpio = -1;
}
+ aic32x4->mclk = devm_clk_get(&i2c->dev, "mclk");
+ if (IS_ERR(aic32x4->mclk))
+ dev_info(&i2c->dev, "No mclk found, continuing without clock\n");
+
if (gpio_is_valid(aic32x4->rstn_gpio)) {
ret = devm_gpio_request_one(&i2c->dev, aic32x4->rstn_gpio,
GPIOF_OUT_INIT_LOW, "tlv320aic32x4 rstn");
--
1.8.5.2
--
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