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Subject[PATCH v6 8/8] ASoC: sam9x5: get codec MCLK via device tree
Date
Instead of having the clock rate hard coded, and thus, only compatible
with one board, we can make it compatible with other implementations.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
---
.../bindings/sound/atmel-sam9x5-wm8731-audio.txt | 4 ++++
arch/arm/boot/dts/at91sam9x5ek.dtsi | 8 ++++++++
sound/soc/atmel/sam9x5_wm8731.c | 18 ++++++++++++++----
3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/atmel-sam9x5-wm8731-audio.txt b/Documentation/devicetree/bindings/sound/atmel-sam9x5-wm8731-audio.txt
index 0720857..114a4c5 100644
--- a/Documentation/devicetree/bindings/sound/atmel-sam9x5-wm8731-audio.txt
+++ b/Documentation/devicetree/bindings/sound/atmel-sam9x5-wm8731-audio.txt
@@ -8,6 +8,8 @@ Required properties:
- atmel,audio-routing: A list of the connections between audio components.
Each entry is a pair of strings, the first being the connection's sink,
the second being the connection's source.
+ - clocks: Must contain an entry for the codec master clock.
+ - clock-names : Must be "mclk" (clock that feeds the codec master clock)

Available audio endpoints for the audio-routing table:

@@ -32,4 +34,6 @@ sound {

atmel,ssc-controller = <&ssc0>;
atmel,audio-codec = <&wm8731>;
+ clocks = <&sound_crystal 0>;
+ clock-names = "mclk";
};
diff --git a/arch/arm/boot/dts/at91sam9x5ek.dtsi b/arch/arm/boot/dts/at91sam9x5ek.dtsi
index 9afe15b..b5ff17c 100644
--- a/arch/arm/boot/dts/at91sam9x5ek.dtsi
+++ b/arch/arm/boot/dts/at91sam9x5ek.dtsi
@@ -114,6 +114,12 @@
};
};

+ sound_crystal: osc@0 {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <12288000>;
+ };
+
sound {
compatible = "atmel,sam9x5-wm8731-audio";

@@ -127,5 +133,7 @@

atmel,ssc-controller = <&ssc0>;
atmel,audio-codec = <&wm8731>;
+ clocks = <&sound_crystal 0>;
+ clock-names = "mclk";
};
};
diff --git a/sound/soc/atmel/sam9x5_wm8731.c b/sound/soc/atmel/sam9x5_wm8731.c
index 992ae38..f33c181 100644
--- a/sound/soc/atmel/sam9x5_wm8731.c
+++ b/sound/soc/atmel/sam9x5_wm8731.c
@@ -23,6 +23,8 @@
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/clk.h>

#include <sound/soc.h>
#include <sound/soc-dai.h>
@@ -31,12 +33,10 @@
#include "../codecs/wm8731.h"
#include "atmel_ssc_dai.h"

-
-#define MCLK_RATE 12288000
-
#define DRV_NAME "sam9x5-snd-wm8731"

struct sam9x5_drvdata {
+ struct clk *mclk;
int ssc_id;
};

@@ -46,6 +46,7 @@ struct sam9x5_drvdata {
static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)
{
struct snd_soc_dai *codec_dai = rtd->codec_dai;
+ struct sam9x5_drvdata *priv = snd_soc_card_get_drvdata(rtd->card);
struct device *dev = rtd->dev;
int ret;

@@ -53,7 +54,8 @@ static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd)

/* set the codec system clock for DAC and ADC */
ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
- MCLK_RATE, SND_SOC_CLOCK_IN);
+ clk_get_rate(priv->mclk),
+ SND_SOC_CLOCK_IN);
if (ret < 0) {
dev_err(dev, "ASoC: Failed to set WM8731 SYSCLK: %d\n", ret);
return ret;
@@ -142,6 +144,13 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)

priv->ssc_id = of_alias_get_id(cpu_np, "ssc");

+ priv->mclk = devm_clk_get(&pdev->dev, "mclk");
+ if (IS_ERR(priv->mclk)) {
+ ret = PTR_ERR(priv->mclk);
+ dev_err(&pdev->dev, "Failed to get MCLK: %d\n", ret);
+ goto out;
+ }
+
ret = atmel_ssc_set_audio(priv->ssc_id);
if (ret != 0) {
dev_err(&pdev->dev,
@@ -153,6 +162,7 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
of_node_put(codec_np);
of_node_put(cpu_np);

+ snd_soc_card_set_drvdata(card, priv);
platform_set_drvdata(pdev, card);

ret = snd_soc_register_card(card);
--
1.7.10.4


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