[PATCH V4 0/2] Add DT support for i2s

[PATCH V4 0/2] Add DT support for i2s

[Padmavathi Venna]

V4 patches are based on Mark Brown's for-next branch of
"git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git"
 
Changes since V3:
	- Added syntex of gpio specifier as suggested by Mark Brown in
	  DT document file
	- Added the requirement for having I2S alias ids
	- Explained about gpio lines
	- Made a seperate patch to get the I2S rclk src clk from alias ID
	  	 
Changes since V2:
        - Rebased on 3.7-rc3
        - Custom DT bindings are prefixed with samsung
        - As generic device tree DMA helpers not yet mainlined
          I am still using custom dma bindings. So added a
          priliminary statement regarding the same. I will rework
          on my patch once generic DMA helpers are mainlined.

Chnages since V1:
        - Rebased on 3.6-rc6

Padmavathi Venna (2):
  ASoC: Samsung: Get I2S src_clk from clock alias id.
  ASoC: SAMSUNG: Add DT support for i2s

 .../devicetree/bindings/sound/samsung-i2s.txt      |   78 +++++++
 include/linux/platform_data/asoc-s3c.h             |    6 -
 sound/soc/samsung/dma.c                            |    1 +
 sound/soc/samsung/dma.h                            |    1 +
 sound/soc/samsung/i2s.c                            |  238 +++++++++++++++----
 5 files changed, 268 insertions(+), 56 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/samsung-i2s.txt

-- 
1.7.4.4

[PATCH V4 1/2] ASoC: Samsung: Get I2S src_clk from clock alias id.

[Padmavathi Venna]

As the I2S src clks are registered with clkdev using generic
connection id, driver can get the clk name using generic id.
So the variable representing the array of rclk src clks is
deleted.

Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
---
 include/linux/platform_data/asoc-s3c.h |    6 ------
 sound/soc/samsung/i2s.c                |   12 ++++++------
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/include/linux/platform_data/asoc-s3c.h b/include/linux/platform_data/asoc-s3c.h
index aa9875f..8827259 100644
--- a/include/linux/platform_data/asoc-s3c.h
+++ b/include/linux/platform_data/asoc-s3c.h
@@ -38,12 +38,6 @@ struct samsung_i2s {
 #define QUIRK_NEED_RSTCLR	(1 << 3)
 	/* Quirks of the I2S controller */
 	u32 quirks;
-
-	/*
-	 * Array of clock names that can be used to generate I2S signals.
-	 * Also corresponds to clocks of I2SMOD[10]
-	 */
-	const char **src_clk;
 	dma_addr_t idma_addr;
 };
 
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index 547b919..aaf57b7 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -49,8 +49,6 @@ struct i2s_dai {
 	struct clk *clk;
 	/* Clock for generating I2S signals */
 	struct clk *op_clk;
-	/* Array of clock names for op_clk */
-	const char **src_clk;
 	/* Pointer to the Primary_Fifo if this is Sec_Fifo, NULL otherwise */
 	struct i2s_dai *pri_dai;
 	/* Pointer to the Secondary_Fifo if it has one, NULL otherwise */
@@ -432,8 +430,12 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai,
 				}
 			}
 
-			i2s->op_clk = clk_get(&i2s->pdev->dev,
-						i2s->src_clk[clk_id]);
+			if (clk_id)
+				i2s->op_clk = clk_get(&i2s->pdev->dev,
+						"i2s_opclk1");
+			else
+				i2s->op_clk = clk_get(&i2s->pdev->dev,
+						"i2s_opclk0");
 			clk_prepare_enable(i2s->op_clk);
 			i2s->rclk_srcrate = clk_get_rate(i2s->op_clk);
 
@@ -1067,7 +1069,6 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
 		(struct s3c2410_dma_client *)&pri_dai->dma_capture;
 	pri_dai->dma_playback.channel = dma_pl_chan;
 	pri_dai->dma_capture.channel = dma_cp_chan;
-	pri_dai->src_clk = i2s_cfg->src_clk;
 	pri_dai->dma_playback.dma_size = 4;
 	pri_dai->dma_capture.dma_size = 4;
 	pri_dai->base = regs_base;
@@ -1088,7 +1089,6 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
 			(struct s3c2410_dma_client *)&sec_dai->dma_playback;
 		/* Use iDMA always if SysDMA not provided */
 		sec_dai->dma_playback.channel = dma_pl_sec_chan ? : -1;
-		sec_dai->src_clk = i2s_cfg->src_clk;
 		sec_dai->dma_playback.dma_size = 4;
 		sec_dai->base = regs_base;
 		sec_dai->quirks = quirks;
-- 
1.7.4.4

[PATCH V4 1/2] ASoC: Samsung: Get I2S src_clk from clock alias id.

[Mark Brown]

On Wed, Nov 28, 2012 at 04:17:48PM +0530, Padmavathi Venna wrote:
> As the I2S src clks are registered with clkdev using generic
> connection id, driver can get the clk name using generic id.
> So the variable representing the array of rclk src clks is
> deleted.

Applied, thanks.
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[PATCH V4 2/2] ASoC: SAMSUNG: Add DT support for i2s

[Padmavathi Venna]

Add support for device based discovery.

Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
---
 .../devicetree/bindings/sound/samsung-i2s.txt      |   78 +++++++
 sound/soc/samsung/dma.c                            |    1 +
 sound/soc/samsung/dma.h                            |    1 +
 sound/soc/samsung/i2s.c                            |  226 ++++++++++++++++----
 4 files changed, 262 insertions(+), 44 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/samsung-i2s.txt

diff --git a/Documentation/devicetree/bindings/sound/samsung-i2s.txt b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
new file mode 100644
index 0000000..14fa12d
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
@@ -0,0 +1,78 @@
+* Samsung I2S controller
+
+Required SoC Specific Properties:
+
+- compatible : "samsung,samsung-i2s"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+
+[PRELIMINARY: the dma channel allocation will change once there are
+official DMA bindings]
+
+- tx-dma-channel-secondary: The dma channel specifier for secondary tx
+  operations. The format of the dma specifier depends on the dma
+  controller.
+- tx-dma-channel: The dma channel specifier for tx operations. The format of
+  the dma specifier depends on the dma controller.
+- rx-dma-channel: The dma channel specifier for rx operations. The format of
+  the dma specifier depends on the dma controller.
+
+Optional SoC Specific Properties:
+
+- samsung,supports-6ch: If the I2S Primary sound source has 5.1 Channel
+  support, this flag is enabled.
+- samsung,supports-rstclr: This flag should be set if I2S software reset bit
+  control is required. When this flag is set I2S software reset bit will be
+  enabled or disabled based on need.
+- samsung,supports-secdai:If I2S block has a secondary FIFO and internal DMA,
+  then this flag is enabled.
+- samsung,idma-addr: Internal DMA register base address of the audio
+  sub system(used in secondary sound source).
+
+Required Board Specific Properties:
+
+- gpios: The gpio specifier for data out,data in, LRCLK, CDCLK and SCLK
+  interface lines. The format of the gpio specifier depends on the gpio
+  controller.
+  The syntax of samsung gpio specifier is
+	<[phandle of the gpio controller node]
+	 [pin number within the gpio controller]
+	 [mux function]
+	 [flags and pull up/down]
+	 [drive strength]>
+
+Aliases:
+
+- All the I2S controller nodes should be represented in the aliases node using
+  the following format 'i2s{n}' where n is a unique number for the alias. The
+  alias nodes are required to get the CPU dai id(device id) in the driver to
+  do the pri_dai and sec_dai registration. The secondary interface of a CPU
+  dai is indexed at [cpu-dai's ID + SAMSUNG_I2S_SECOFF]
+
+Example:
+
+- SoC Specific Portion:
+
+i2s at 03830000 {
+	compatible = "samsung,samsung-i2s";
+	reg = <0x03830000 0x100>;
+	tx-dma-channel-secondary = <&pdma0 8>;
+	tx-dma-channel = <&pdma0 10>;
+	rx-dma-channel = <&pdma0 9>;
+	samsung,supports-6ch;
+	samsung,supports-rstclr;
+	samsung,supports-secdai;
+	samsung,idma-addr = <0x03000000>;
+};
+
+- Board Specific Portion:
+
+i2s_0: i2s at 03830000 {
+	gpios = <&gpz 0 2 0 0>, /* I2S_0_SCLK */
+		<&gpz 1 2 0 0>, /* I2S_0_CDCLK */
+		<&gpz 2 2 0 0>, /* I2S_0_LRCK */
+		<&gpz 3 2 0 0>, /* I2S_0_SDI */
+		<&gpz 4 2 0 0>, /* I2S_0_SDO[1] */
+		<&gpz 5 2 0 0>, /* I2S_0_SDO[2] */
+		<&gpz 6 2 0 0>; /* I2S_0_SDO[3] */
+};
diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c
index b70964e..359708c 100644
--- a/sound/soc/samsung/dma.c
+++ b/sound/soc/samsung/dma.c
@@ -168,6 +168,7 @@ static int dma_hw_params(struct snd_pcm_substream *substream,
 		req.cap = (samsung_dma_has_circular() ?
 			DMA_CYCLIC : DMA_SLAVE);
 		req.client = prtd->params->client;
+		req.dt_dmach_prop = prtd->params->dma_prop;
 		config.direction =
 			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
 			? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h
index 7d1ead7..2e60415 100644
--- a/sound/soc/samsung/dma.h
+++ b/sound/soc/samsung/dma.h
@@ -19,6 +19,7 @@ struct s3c_dma_params {
 	int dma_size;			/* Size of the DMA transfer */
 	unsigned ch;
 	struct samsung_dma_ops *ops;
+	struct property *dma_prop;
 };
 
 #endif
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index aaf57b7..a7d03d9 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -15,11 +15,15 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
 
 #include <sound/soc.h>
 #include <sound/pcm_params.h>
 
+#include <mach/dma.h>
+
 #include <linux/platform_data/asoc-s3c.h>
 
 #include "dma.h"
@@ -66,6 +70,8 @@ struct i2s_dai {
 	u32	suspend_i2smod;
 	u32	suspend_i2scon;
 	u32	suspend_i2spsr;
+	unsigned long gpios[7];	/* i2s gpio line numbers */
+	int	dev_id;		/* i2s dev id */
 };
 
 /* Lock for cross i/f checks */
@@ -982,8 +988,9 @@ struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
 		i2s->i2s_dai_drv.capture.formats = SAMSUNG_I2S_FMTS;
 	} else {	/* Create a new platform_device for Secondary */
 		i2s->pdev = platform_device_register_resndata(NULL,
-				pdev->name, pdev->id + SAMSUNG_I2S_SECOFF,
-				NULL, 0, NULL, 0);
+				"samsung-i2s",
+				i2s->dev_id + SAMSUNG_I2S_SECOFF, NULL, 0,
+				NULL, 0);
 		if (IS_ERR(i2s->pdev))
 			return NULL;
 	}
@@ -994,49 +1001,154 @@ struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
 	return i2s;
 }
 
+#ifdef CONFIG_OF
+static int samsung_i2s_parse_dt_gpio(struct i2s_dai *i2s)
+{
+	struct device *dev = &i2s->pdev->dev;
+	int index, gpio, ret;
+
+	for (index = 0; index < 7; index++) {
+		gpio = of_get_gpio(dev->of_node, index);
+		if (!gpio_is_valid(gpio)) {
+			dev_err(dev, "invalid gpio[%d]: %d\n", index, gpio);
+			goto free_gpio;
+		}
+
+		ret = gpio_request(gpio, dev_name(dev));
+		if (ret) {
+			dev_err(dev, "gpio [%d] request failed\n", gpio);
+			goto free_gpio;
+		}
+		i2s->gpios[index] = gpio;
+	}
+	return 0;
+
+free_gpio:
+	while (--index >= 0)
+		gpio_free(i2s->gpios[index]);
+	return -EINVAL;
+}
+
+static void samsung_i2s_dt_gpio_free(struct i2s_dai *i2s)
+{
+	unsigned int index;
+	for (index = 0; index < 7; index++)
+		gpio_free(i2s->gpios[index]);
+}
+#else
+static int samsung_i2s_parse_dt_gpio(struct i2s_dai *dai)
+{
+	return -EINVAL;
+}
+
+static void samsung_i2s_dt_gpio_free(struct i2s_dai *dai)
+{
+}
+
+#endif
+
 static __devinit int samsung_i2s_probe(struct platform_device *pdev)
 {
-	u32 dma_pl_chan, dma_cp_chan, dma_pl_sec_chan;
+	u32 dma_pl_chan, dma_cp_chan;
+	u32 dma_pl_sec_chan = 0;
 	struct i2s_dai *pri_dai, *sec_dai = NULL;
-	struct s3c_audio_pdata *i2s_pdata;
-	struct samsung_i2s *i2s_cfg;
+	struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
+	struct samsung_i2s *i2s_cfg = NULL;
 	struct resource *res;
-	u32 regs_base, quirks;
-	int ret = 0;
+	u32 regs_base, quirks = 0, idma_addr = 0;
+	struct property *prop;
+	struct device_node *np = pdev->dev.of_node;
+	int ret = 0, id;
 
 	/* Call during Seconday interface registration */
-	if (pdev->id >= SAMSUNG_I2S_SECOFF) {
+	if (np) {
+		id = of_alias_get_id(np, "i2s");
+		if (id < 0) {
+			dev_err(&pdev->dev, "failed to get alias id:%d\n", id);
+			return id;
+		}
+	} else {
+		id = pdev->id;
+	}
+
+	if (id >= SAMSUNG_I2S_SECOFF) {
 		sec_dai = dev_get_drvdata(&pdev->dev);
 		snd_soc_register_dai(&sec_dai->pdev->dev,
 			&sec_dai->i2s_dai_drv);
 		return 0;
 	}
 
-	i2s_pdata = pdev->dev.platform_data;
-	if (i2s_pdata == NULL) {
-		dev_err(&pdev->dev, "Can't work without s3c_audio_pdata\n");
-		return -EINVAL;
+	pri_dai = i2s_alloc_dai(pdev, false);
+	if (!pri_dai) {
+		dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
+		return -ENOMEM;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "Unable to get I2S-TX dma resource\n");
-		return -ENXIO;
-	}
-	dma_pl_chan = res->start;
+	if (!np) {
+		res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+		if (!res) {
+			dev_err(&pdev->dev,
+				"Unable to get I2S-TX dma resource\n");
+			return -ENXIO;
+		}
+		dma_pl_chan = res->start;
 
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!res) {
-		dev_err(&pdev->dev, "Unable to get I2S-RX dma resource\n");
-		return -ENXIO;
-	}
-	dma_cp_chan = res->start;
+		res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+		if (!res) {
+			dev_err(&pdev->dev,
+				"Unable to get I2S-RX dma resource\n");
+			return -ENXIO;
+		}
+		dma_cp_chan = res->start;
 
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
-	if (res)
-		dma_pl_sec_chan = res->start;
-	else
-		dma_pl_sec_chan = 0;
+		res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
+		if (res)
+			dma_pl_sec_chan = res->start;
+
+		if (&i2s_pdata->type)
+			i2s_cfg = &i2s_pdata->type.i2s;
+
+		if (i2s_cfg) {
+			quirks = i2s_cfg->quirks;
+			idma_addr = i2s_cfg->idma_addr;
+		}
+	} else {
+		prop = of_find_property(np, "tx-dma-channel", NULL);
+		if (!prop) {
+			dev_err(&pdev->dev, "tx dma channel property not"\
+					"specified\n");
+			return -ENXIO;
+		}
+		dma_pl_chan = DMACH_DT_PROP;
+		pri_dai->dma_playback.dma_prop = prop;
+
+		prop = of_find_property(np, "rx-dma-channel", NULL);
+		if (!prop) {
+			dev_err(&pdev->dev, "tx dma channel property not"\
+					"specified\n");
+			return -ENXIO;
+		}
+		dma_cp_chan = DMACH_DT_PROP;
+		pri_dai->dma_capture.dma_prop = prop;
+
+		if (of_find_property(np, "samsung,supports-6ch", NULL))
+			quirks |= QUIRK_PRI_6CHAN;
+
+		if (of_find_property(np, "samsung,supports-secdai", NULL))
+			quirks |= QUIRK_SEC_DAI;
+
+		if (of_find_property(np, "samsung,supports-rstclr", NULL))
+			quirks |= QUIRK_NEED_RSTCLR;
+
+		if (of_property_read_u32(np, "samsung,idma-addr",
+					 &idma_addr)) {
+			if (quirks & QUIRK_SEC_DAI) {
+				dev_err(&pdev->dev, "idma address is not"\
+						"specified");
+				return -EINVAL;
+			}
+		}
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -1051,16 +1163,6 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
 	}
 	regs_base = res->start;
 
-	i2s_cfg = &i2s_pdata->type.i2s;
-	quirks = i2s_cfg->quirks;
-
-	pri_dai = i2s_alloc_dai(pdev, false);
-	if (!pri_dai) {
-		dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
-		ret = -ENOMEM;
-		goto err;
-	}
-
 	pri_dai->dma_playback.dma_addr = regs_base + I2STXD;
 	pri_dai->dma_capture.dma_addr = regs_base + I2SRXD;
 	pri_dai->dma_playback.client =
@@ -1073,6 +1175,7 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
 	pri_dai->dma_capture.dma_size = 4;
 	pri_dai->base = regs_base;
 	pri_dai->quirks = quirks;
+	pri_dai->dev_id = id;
 
 	if (quirks & QUIRK_PRI_6CHAN)
 		pri_dai->i2s_dai_drv.playback.channels_max = 6;
@@ -1087,20 +1190,42 @@ static __devinit int samsung_i2s_probe(struct platform_device *pdev)
 		sec_dai->dma_playback.dma_addr = regs_base + I2STXDS;
 		sec_dai->dma_playback.client =
 			(struct s3c2410_dma_client *)&sec_dai->dma_playback;
+
+		if (np) {
+			prop = of_find_property(np, "tx-dma-channel-secondary",
+						NULL);
+			if (!prop) {
+				dev_err(&pdev->dev, "tx dma channel property"\
+						"not specified\n");
+				ret = -ENXIO;
+				goto err;
+			}
+			sec_dai->dma_playback.dma_prop = prop;
+		}
+
 		/* Use iDMA always if SysDMA not provided */
 		sec_dai->dma_playback.channel = dma_pl_sec_chan ? : -1;
 		sec_dai->dma_playback.dma_size = 4;
 		sec_dai->base = regs_base;
 		sec_dai->quirks = quirks;
-		sec_dai->idma_playback.dma_addr = i2s_cfg->idma_addr;
+		sec_dai->dev_id = id;
+		sec_dai->idma_playback.dma_addr = idma_addr;
 		sec_dai->pri_dai = pri_dai;
 		pri_dai->sec_dai = sec_dai;
 	}
 
-	if (i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
-		dev_err(&pdev->dev, "Unable to configure gpio\n");
-		ret = -EINVAL;
-		goto err;
+	if (np) {
+		if (samsung_i2s_parse_dt_gpio(pri_dai)) {
+			dev_err(&pdev->dev, "Unable to configure gpio\n");
+			ret = -EINVAL;
+			goto err;
+		}
+	} else {
+		if (i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
+			dev_err(&pdev->dev, "Unable to configure gpio\n");
+			ret = -EINVAL;
+			goto err;
+		}
 	}
 
 	snd_soc_register_dai(&pri_dai->pdev->dev, &pri_dai->i2s_dai_drv);
@@ -1118,10 +1243,14 @@ static __devexit int samsung_i2s_remove(struct platform_device *pdev)
 {
 	struct i2s_dai *i2s, *other;
 	struct resource *res;
+	struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
 
 	i2s = dev_get_drvdata(&pdev->dev);
 	other = i2s->pri_dai ? : i2s->sec_dai;
 
+	if (!i2s_pdata->cfg_gpio && pdev->dev.of_node)
+		samsung_i2s_dt_gpio_free(i2s->pri_dai);
+
 	if (other) {
 		other->pri_dai = NULL;
 		other->sec_dai = NULL;
@@ -1140,12 +1269,21 @@ static __devexit int samsung_i2s_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_i2s_match[] = {
+	{ .compatible = "samsung,samsung-i2s" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_i2s_match);
+#endif
+
 static struct platform_driver samsung_i2s_driver = {
 	.probe  = samsung_i2s_probe,
 	.remove = __devexit_p(samsung_i2s_remove),
 	.driver = {
 		.name = "samsung-i2s",
 		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(exynos_i2s_match),
 	},
 };
 
-- 
1.7.4.4

[PATCH V4 0/2] Add DT support for i2s

[Padma Venkat]

Hi Mark,

On Wed, Nov 28, 2012 at 4:17 PM, Padmavathi Venna <padma.v@samsung.com> wrote:
> V4 patches are based on Mark Brown's for-next branch of
> "git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git"
>
> Changes since V3:
>         - Added syntex of gpio specifier as suggested by Mark Brown in
>           DT document file
>         - Added the requirement for having I2S alias ids
>         - Explained about gpio lines
>         - Made a seperate patch to get the I2S rclk src clk from alias ID
>
> Changes since V2:
>         - Rebased on 3.7-rc3
>         - Custom DT bindings are prefixed with samsung
>         - As generic device tree DMA helpers not yet mainlined
>           I am still using custom dma bindings. So added a
>           priliminary statement regarding the same. I will rework
>           on my patch once generic DMA helpers are mainlined.
>
> Chnages since V1:
>         - Rebased on 3.6-rc6
>
> Padmavathi Venna (2):
>   ASoC: Samsung: Get I2S src_clk from clock alias id.
>   ASoC: SAMSUNG: Add DT support for i2s

Any comments on DT support for i2s patch?  If not when this patch can be pulled?

>
>  .../devicetree/bindings/sound/samsung-i2s.txt      |   78 +++++++
>  include/linux/platform_data/asoc-s3c.h             |    6 -
>  sound/soc/samsung/dma.c                            |    1 +
>  sound/soc/samsung/dma.h                            |    1 +
>  sound/soc/samsung/i2s.c                            |  238 +++++++++++++++----
>  5 files changed, 268 insertions(+), 56 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/sound/samsung-i2s.txt
>
> --
> 1.7.4.4
>

Thanks
Padma

[PATCH V4 0/2] Add DT support for i2s

[Mark Brown]

On Thu, Dec 06, 2012 at 09:31:40AM +0530, Padma Venkat wrote:
> On Wed, Nov 28, 2012 at 4:17 PM, Padmavathi Venna <padma.v@samsung.com> wrote:

> > Padmavathi Venna (2):
> >   ASoC: Samsung: Get I2S src_clk from clock alias id.
> >   ASoC: SAMSUNG: Add DT support for i2s

> Any comments on DT support for i2s patch?  If not when this patch can be pulled?

Don't send contentless pings.

I still don't really like what's going on with aliases here, I need to
understand why things are structured the way they are to say something
about that.

[PATCH V4 0/2] Add DT support for i2s

[Grant Likely]

On Thu, 6 Dec 2012 13:11:42 +0900, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote:
> On Thu, Dec 06, 2012 at 09:31:40AM +0530, Padma Venkat wrote:
> > On Wed, Nov 28, 2012 at 4:17 PM, Padmavathi Venna <padma.v@samsung.com> wrote:
> 
> > > Padmavathi Venna (2):
> > >   ASoC: Samsung: Get I2S src_clk from clock alias id.
> > >   ASoC: SAMSUNG: Add DT support for i2s
> 
> > Any comments on DT support for i2s patch?  If not when this patch can be pulled?
> 
> Don't send contentless pings.
> 
> I still don't really like what's going on with aliases here, I need to
> understand why things are structured the way they are to say something
> about that.

Right. On a brief look, it appears that the binding is using aliases as
a way to encode implementation specific details of the driver.

g.

[PATCH V4 0/2] Add DT support for i2s

[Padma Venkat]

Hi,

On Fri, Dec 7, 2012 at 7:21 PM, Grant Likely <grant.likely@secretlab.ca> wrote:
> On Thu, 6 Dec 2012 13:11:42 +0900, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote:
>> On Thu, Dec 06, 2012 at 09:31:40AM +0530, Padma Venkat wrote:
>> > On Wed, Nov 28, 2012 at 4:17 PM, Padmavathi Venna <padma.v@samsung.com> wrote:
>>
>> > > Padmavathi Venna (2):
>> > >   ASoC: Samsung: Get I2S src_clk from clock alias id.
>> > >   ASoC: SAMSUNG: Add DT support for i2s
>>
>> > Any comments on DT support for i2s patch?  If not when this patch can be pulled?
>>
>> Don't send contentless pings.
>>
>> I still don't really like what's going on with aliases here, I need to
>> understand why things are structured the way they are to say something
>> about that.
>
> Right. On a brief look, it appears that the binding is using aliases as
> a way to encode implementation specific details of the driver.

Samsung i2s driver registers the platform device twice one for the
samsung-i2s.0,1 or 2 and two for samsung-i2s.4(which actually doesn't
represent any H/W peripheral). The max number of I2S blocks on any
Samsung SoC are 3, the secondary device registration starts with
device number 4.The second time registration is for the secondary fifo
interface of a CPU dai if any exists.

With DT support the device number in the driver is always -1, I used
alias id for the above purpose.

>
> g.
>
Thanks
Padma

[PATCH V4 0/2] Add DT support for i2s

[Mark Brown]

On Sat, Dec 08, 2012 at 10:07:54AM +0530, Padma Venkat wrote:

> Samsung i2s driver registers the platform device twice one for the
> samsung-i2s.0,1 or 2 and two for samsung-i2s.4(which actually doesn't
> represent any H/W peripheral). The max number of I2S blocks on any
> Samsung SoC are 3, the secondary device registration starts with
> device number 4.The second time registration is for the secondary fifo
> interface of a CPU dai if any exists.

> With DT support the device number in the driver is always -1, I used
> alias id for the above purpose.

So, the thing here is that while the numbers were totally OK for
platform device use they really don't fit into DT at all well.  I think
the thing here is to either have a node for the second CPU side DAI or
to have a single DT link automatically expanded into two DAI links.  I
think the second option is much better - there's only one link on the
board, it just happens to get expanded into two the way things are
currently implemented in ASoC.

This stuff probably also ought to be moved over to soc-pcm as well by
the way.
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[PATCH V4 0/2] Add DT support for i2s

[Padma Venkat]

Hi Mark,

On Sun, Dec 9, 2012 at 12:56 PM, Mark Brown
<broonie@opensource.wolfsonmicro.com> wrote:
> On Sat, Dec 08, 2012 at 10:07:54AM +0530, Padma Venkat wrote:
>
>> Samsung i2s driver registers the platform device twice one for the
>> samsung-i2s.0,1 or 2 and two for samsung-i2s.4(which actually doesn't
>> represent any H/W peripheral). The max number of I2S blocks on any
>> Samsung SoC are 3, the secondary device registration starts with
>> device number 4.The second time registration is for the secondary fifo
>> interface of a CPU dai if any exists.
>
>> With DT support the device number in the driver is always -1, I used
>> alias id for the above purpose.
>
> So, the thing here is that while the numbers were totally OK for
> platform device use they really don't fit into DT at all well.  I think
> the thing here is to either have a node for the second CPU side DAI or
> to have a single DT link automatically expanded into two DAI links.  I
> think the second option is much better - there's only one link on the
> board, it just happens to get expanded into two the way things are
> currently implemented in ASoC.

Could you please explain me in more detail about "single DT link
automatically expanded into two DAI links".
How this can be done?

>
> This stuff probably also ought to be moved over to soc-pcm as well by
> the way.
Thanks
Padma

[PATCH V4 0/2] Add DT support for i2s

[Mark Brown]

On Mon, Dec 10, 2012 at 04:30:50PM +0530, Padma Venkat wrote:

> Could you please explain me in more detail about "single DT link
> automatically expanded into two DAI links".
> How this can be done?

The device tree should only represent the single physical link that
exists and the handling of the DAIs should be done at runtime by some
piece of software.