Patchwork [v2] ARM: kirkwood: extend the kirkwood i2s driver for DT usage

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Submitter Jean-Francois Moine
Date April 2, 2013, 6:13 p.m.
Message ID <20130402201348.4ab406fb@armhf>
Download mbox | patch
Permalink /patch/233110/
State New
Headers show

Comments

Jean-Francois Moine - April 2, 2013, 6:13 p.m.
The kirkwood i2s driver is used without DT in the Kirkwood machine.
This patch adds a DT compatible definition for use in other Marvell
machines as the Armada 88AP510 (Dove).

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
---
v2
  - this patch replaces the previous
	[PATCH 2/2] ARM: kirkwood: extend the kirkwood i2s driver for DT usage
  - 2 possible clocks (Sebastian Hesselbarth)
  - shorter io mapping (Andrew Lunn)
  - less #ifdef's
---
 .../devicetree/bindings/sound/kirkwood-i2s.txt     |   26 +++++++++
 sound/soc/kirkwood/kirkwood-i2s.c                  |   58 +++++++++++++++-----
 2 files changed, 70 insertions(+), 14 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/kirkwood-i2s.txt
Sebastian Hesselbarth - April 2, 2013, 9:47 p.m.
On 04/02/2013 08:13 PM, Jean-Francois Moine wrote:
> The kirkwood i2s driver is used without DT in the Kirkwood machine.
> This patch adds a DT compatible definition for use in other Marvell
> machines as the Armada 88AP510 (Dove).
>
> Signed-off-by: Jean-Francois Moine<moinejf@free.fr>
> ---
[...]
> +Optional property:
> +
> +- marvell,burst-size: burst size which can be only 32 or 128.
> +  Default value is 128.

Jean-Francois,

I still think we don't need to expose burst-size at all. Is there
any SoC using a different burst-size of 128?

> +
> +Example:
> +
> +i2s1: audio-controller@b4000 {
> +	compatible = "marvell,kirkwood-i2s";
> +	reg =<0xb4000 0x2210>;
> +	interrupts =<21>,<22>;
> +	clocks =<&gate_clk 13>;
> +};
> diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c
> index c74c890..37370b3 100644
> --- a/sound/soc/kirkwood/kirkwood-i2s.c
> +++ b/sound/soc/kirkwood/kirkwood-i2s.c
> @@ -12,7 +12,6 @@
>
>   #include<linux/init.h>
>   #include<linux/module.h>
> -#include<linux/platform_device.h>
>   #include<linux/io.h>
>   #include<linux/slab.h>
>   #include<linux/mbus.h>
> @@ -22,6 +21,8 @@
>   #include<sound/pcm_params.h>
>   #include<sound/soc.h>
>   #include<linux/platform_data/asoc-kirkwood.h>
> +#include<linux/of.h>
> +
>   #include "kirkwood.h"
>
>   #define DRV_NAME	"kirkwood-i2s"
> @@ -457,6 +458,7 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
>   	struct snd_soc_dai_driver *soc_dai =&kirkwood_i2s_dai;
>   	struct kirkwood_dma_data *priv;
>   	struct resource *mem;
> +	struct device_node *np;

struct device_node *np = pdev->dev.of_node;

and remove the assignment below.

>   	int err;
>
>   	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> @@ -482,24 +484,41 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
>   		return -ENXIO;
>   	}
>
> -	if (!data) {
> -		dev_err(&pdev->dev, "no platform data ?!\n");
> -		return -EINVAL;
> -	}
> +	/* get the DT or static parameters */
> +	np = pdev->dev.of_node;
> +	if (np) {
> +		u32 val;
> +
> +		if (of_property_read_u32(np, "marvell,burst-size",&val)) {
> +			val = 128;		/* default value */
> +		} else if (val != 32&&  val != 128) {
> +			dev_err(&pdev->dev,
> +				"'marvell,burst-size' can be only 32 or 128\n");
> +			return -EINVAL;
> +		}
> +		priv->burst = val;
> +		priv->clk = of_clk_get(np, 0);		/* internal clock */
> +		priv->extclk = of_clk_get(np, 1); /* optional external clock */
> +	} else {
> +		if (!data) {
> +			dev_err(&pdev->dev, "no platform data ?!\n");
> +			return -EINVAL;
> +		}
> +		priv->burst = data->burst;
>
> -	priv->burst = data->burst;
> +		priv->clk = clk_get(&pdev->dev, NULL);
> +		priv->extclk = clk_get(&pdev->dev, "extclk");
> +	}
>
> -	priv->clk = devm_clk_get(&pdev->dev, NULL);
>   	if (IS_ERR(priv->clk)) {
>   		dev_err(&pdev->dev, "no clock\n");
> -		return PTR_ERR(priv->clk);
> +		err = PTR_ERR(priv->clk);
> +		goto error;
>   	}
> -
>   	err = clk_prepare_enable(priv->clk);
>   	if (err<  0)
> -		return err;
> +		goto error;
>
> -	priv->extclk = clk_get(&pdev->dev, "extclk");
>   	if (!IS_ERR(priv->extclk)) {
>   		if (priv->extclk == priv->clk) {
>   			clk_put(priv->extclk);
> @@ -516,7 +535,7 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
>   	priv->ctl_rec = KIRKWOOD_RECCTL_SIZE_24;
>
>   	/* Select the burst size */
> -	if (data->burst == 32) {
> +	if (priv->burst == 32) {
>   		priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_32;
>   		priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_32;
>   	} else {
> @@ -528,12 +547,13 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
>   	if (!err)
>   		return 0;
>   	dev_err(&pdev->dev, "snd_soc_register_dai failed\n");
> -
> +error:
>   	if (!IS_ERR(priv->extclk)) {
>   		clk_disable_unprepare(priv->extclk);
>   		clk_put(priv->extclk);
>   	}
>   	clk_disable_unprepare(priv->clk);
> +	clk_put(priv->clk);
>
>   	return err;
>   }
> @@ -549,16 +569,26 @@ static int kirkwood_i2s_dev_remove(struct platform_device *pdev)
>   		clk_put(priv->extclk);
>   	}
>   	clk_disable_unprepare(priv->clk);
> +	clk_put(priv->clk);
>
>   	return 0;
>   }
>
> +#ifdef CONFIG_OF
> +static struct of_device_id kirkwood_i2s_of_match[] = {
> +	{ .compatible = "marvell,kirkwood-i2s" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, kirkwood_i2s_of_match);
> +#endif
> +

What about kirkwood-dma? We don't want to have that as another DT node.
IMHO both kirkwood-dma and kirkwood-i2s should be merged into one file,
then dma can be initialized by a common probe function.

Sebastian

>   static struct platform_driver kirkwood_i2s_driver = {
>   	.probe  = kirkwood_i2s_dev_probe,
>   	.remove = kirkwood_i2s_dev_remove,
>   	.driver = {
>   		.name = DRV_NAME,
>   		.owner = THIS_MODULE,
> +		.of_match_table = of_match_ptr(kirkwood_i2s_of_match),
>   	},
>   };
>

Patch

diff --git a/Documentation/devicetree/bindings/sound/kirkwood-i2s.txt b/Documentation/devicetree/bindings/sound/kirkwood-i2s.txt
new file mode 100644
index 0000000..d1caa59
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/kirkwood-i2s.txt
@@ -0,0 +1,26 @@ 
+* Kirkwood I2S controller
+
+Required properties:
+
+- compatible: "marvell,kirkwood-i2s"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- interrupts: list of two irq numbers.
+  The first irq is used for data flow and the second one is used for errors.
+- clocks: one or two phandles.
+  The first one is mandatory and defines the internal clock.
+  The second one is optional and defines an external clock.
+
+Optional property:
+
+- marvell,burst-size: burst size which can be only 32 or 128.
+  Default value is 128.
+
+Example:
+
+i2s1: audio-controller@b4000 {
+	compatible = "marvell,kirkwood-i2s";
+	reg = <0xb4000 0x2210>;
+	interrupts = <21>, <22>;
+	clocks = <&gate_clk 13>;
+};
diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c
index c74c890..37370b3 100644
--- a/sound/soc/kirkwood/kirkwood-i2s.c
+++ b/sound/soc/kirkwood/kirkwood-i2s.c
@@ -12,7 +12,6 @@ 
 
 #include <linux/init.h>
 #include <linux/module.h>
-#include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/mbus.h>
@@ -22,6 +21,8 @@ 
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <linux/platform_data/asoc-kirkwood.h>
+#include <linux/of.h>
+
 #include "kirkwood.h"
 
 #define DRV_NAME	"kirkwood-i2s"
@@ -457,6 +458,7 @@  static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 	struct snd_soc_dai_driver *soc_dai = &kirkwood_i2s_dai;
 	struct kirkwood_dma_data *priv;
 	struct resource *mem;
+	struct device_node *np;
 	int err;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -482,24 +484,41 @@  static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 		return -ENXIO;
 	}
 
-	if (!data) {
-		dev_err(&pdev->dev, "no platform data ?!\n");
-		return -EINVAL;
-	}
+	/* get the DT or static parameters */
+	np = pdev->dev.of_node;
+	if (np) {
+		u32 val;
+
+		if (of_property_read_u32(np, "marvell,burst-size", &val)) {
+			val = 128;		/* default value */
+		} else if (val != 32 && val != 128) {
+			dev_err(&pdev->dev,
+				"'marvell,burst-size' can be only 32 or 128\n");
+			return -EINVAL;
+		}
+		priv->burst = val;
+		priv->clk = of_clk_get(np, 0);		/* internal clock */
+		priv->extclk = of_clk_get(np, 1); /* optional external clock */
+	} else {
+		if (!data) {
+			dev_err(&pdev->dev, "no platform data ?!\n");
+			return -EINVAL;
+		}
+		priv->burst = data->burst;
 
-	priv->burst = data->burst;
+		priv->clk = clk_get(&pdev->dev, NULL);
+		priv->extclk = clk_get(&pdev->dev, "extclk");
+	}
 
-	priv->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(priv->clk)) {
 		dev_err(&pdev->dev, "no clock\n");
-		return PTR_ERR(priv->clk);
+		err = PTR_ERR(priv->clk);
+		goto error;
 	}
-
 	err = clk_prepare_enable(priv->clk);
 	if (err < 0)
-		return err;
+		goto error;
 
-	priv->extclk = clk_get(&pdev->dev, "extclk");
 	if (!IS_ERR(priv->extclk)) {
 		if (priv->extclk == priv->clk) {
 			clk_put(priv->extclk);
@@ -516,7 +535,7 @@  static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 	priv->ctl_rec = KIRKWOOD_RECCTL_SIZE_24;
 
 	/* Select the burst size */
-	if (data->burst == 32) {
+	if (priv->burst == 32) {
 		priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_32;
 		priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_32;
 	} else {
@@ -528,12 +547,13 @@  static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 	if (!err)
 		return 0;
 	dev_err(&pdev->dev, "snd_soc_register_dai failed\n");
-
+error:
 	if (!IS_ERR(priv->extclk)) {
 		clk_disable_unprepare(priv->extclk);
 		clk_put(priv->extclk);
 	}
 	clk_disable_unprepare(priv->clk);
+	clk_put(priv->clk);
 
 	return err;
 }
@@ -549,16 +569,26 @@  static int kirkwood_i2s_dev_remove(struct platform_device *pdev)
 		clk_put(priv->extclk);
 	}
 	clk_disable_unprepare(priv->clk);
+	clk_put(priv->clk);
 
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static struct of_device_id kirkwood_i2s_of_match[] = {
+	{ .compatible = "marvell,kirkwood-i2s" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, kirkwood_i2s_of_match);
+#endif
+
 static struct platform_driver kirkwood_i2s_driver = {
 	.probe  = kirkwood_i2s_dev_probe,
 	.remove = kirkwood_i2s_dev_remove,
 	.driver = {
 		.name = DRV_NAME,
 		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(kirkwood_i2s_of_match),
 	},
 };