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

From: [email-masked] (Jean-Francois Moine)
Date: Tue, 2 Apr 2013 20:13:48 +0200

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 <[email-masked]>
---
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

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 at 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),
 	},
 };
 
-- 
1.7.10.4

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