[PATCH v5 0/4] ASoC: davinci-mcbsp: add binding for McBSP

[PATCH v5 0/4] ASoC: davinci-mcbsp: add binding for McBSP

[Petr Kulhavy]

This series of patches adds devicetree support for the davinci McBSP audio
interface.

Changes in version 5 of the patch:

* rebased to the current master of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci.git
* independent changes submitted separately (3/7 and 7/7 of the version 4)
* 5/7 of the version 4 removed as already applied
* corrected mcbsp0 and mcbsp1 nodes in the DTS file: using correct address and sound@ prefix

[PATCH v5 1/4] ASoC: davinci-mcbsp: add binding for McBSP

[Petr Kulhavy]

Add devicetree binding for the TI DA850/OMAP-L138/AM18xx
MultiChannel Buffered Serial Port (McBSP)

The optional register range "dat" is not implemented at the moment.
The current driver supports only DMA into RX/TX registers but no FIFO.
Once the FIFO is implemented in the driver the "dat" range will be used.

Signed-off-by: Petr Kulhavy <petr@barix.com>
---
v1: initial
v2: add missing TC channel in dmas properties (for compatibility with the new EDMA3 binding)
    remove "-audio" postfix from the compatible string
    remove "channel-combine" property
v3: remove the index note from the "mpu" property.
    specify exactly the supported platforms in compatible string
v4: minor correction in the example ("interrupt names"), re-added index note to the "mpu" property.
v5: example updated to match da850.dtsi: using "sound@" and removed leading zeros from the reg property

 .../devicetree/bindings/sound/davinci-mcbsp.txt    | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/davinci-mcbsp.txt

diff --git a/Documentation/devicetree/bindings/sound/davinci-mcbsp.txt b/Documentation/devicetree/bindings/sound/davinci-mcbsp.txt
new file mode 100644
index 000000000000..e9184ff3c2fa
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/davinci-mcbsp.txt
@@ -0,0 +1,52 @@
+Texas Instruments DaVinci McBSP module
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This binding describes the "Multi-channel Buffered Serial Port" (McBSP)
+audio interface found in some TI DaVinci processors like the OMAP-L138 or AM180x.
+
+
+Required properties:
+~~~~~~~~~~~~~~~~~~~~
+- compatible :
+        "ti,da850-mcbsp" : for DA850, AM180x and OPAM-L138 platforms
+
+- reg : physical base address and length of the controller memory mapped
+        region(s).
+- reg-names : Should contain:
+        * "mpu" for the main registers (required). For compatibility
+          with the existing software, this is required to be the first entry.
+        * "dat" for the data FIFO (optional).
+
+- dmas: three element list of DMA controller phandles, DMA request line and
+	TC channel ordered triplets.
+- dma-names: identifier string for each DMA request line in the dmas property.
+	These strings correspond 1:1 with the ordered pairs in dmas. The dma
+	identifiers must be "rx" and "tx".
+
+Optional properties:
+~~~~~~~~~~~~~~~~~~~~
+- interrupts : Interrupt numbers for McBSP
+- interrupt-names : Known interrupt names are "rx" and "tx"
+
+- pinctrl-0: Should specify pin control group used for this controller.
+- pinctrl-names: Should contain only one value - "default", for more details
+        please refer to pinctrl-bindings.txt
+
+Example (AM1808):
+~~~~~~~~~~~~~~~~~
+
+mcbsp0: sound at 110000 {
+	compatible = "ti,da850-mcbsp";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcbsp0_pins>;
+
+	reg = 	<0x110000 0x1000>,
+		<0x310000 0x1000>;
+	reg-names = "mpu", "dat";
+	interrupts = <97 98>;
+	interrupt-names = "rx", "tx";
+	dmas = <&edma0 3 1
+		&edma0 2 1>;
+	dma-names = "tx", "rx";
+	status = "okay";
+};
-- 
1.9.1

[PATCH v5 1/4] ASoC: davinci-mcbsp: add binding for McBSP

[Rob Herring]

On Mon, May 09, 2016 at 04:35:19PM +0200, Petr Kulhavy wrote:
> Add devicetree binding for the TI DA850/OMAP-L138/AM18xx
> MultiChannel Buffered Serial Port (McBSP)
> 
> The optional register range "dat" is not implemented at the moment.
> The current driver supports only DMA into RX/TX registers but no FIFO.
> Once the FIFO is implemented in the driver the "dat" range will be used.
> 
> Signed-off-by: Petr Kulhavy <petr@barix.com>
> ---
> v1: initial
> v2: add missing TC channel in dmas properties (for compatibility with the new EDMA3 binding)
>     remove "-audio" postfix from the compatible string
>     remove "channel-combine" property
> v3: remove the index note from the "mpu" property.
>     specify exactly the supported platforms in compatible string
> v4: minor correction in the example ("interrupt names"), re-added index note to the "mpu" property.
> v5: example updated to match da850.dtsi: using "sound@" and removed leading zeros from the reg property
> 
>  .../devicetree/bindings/sound/davinci-mcbsp.txt    | 52 ++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/davinci-mcbsp.txt

Acked-by: Rob Herring <robh@kernel.org>

[PATCH v5 2/4] ASoC: Davinci: McBSP: add device tree support for McBSP

[Petr Kulhavy]

This adds DT support for the TI DA8xx/OMAP-L1x/AM17xx/AM18xx McBSP driver.

Signed-off-by: Petr Kulhavy <petr@barix.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
v1: initial
v2: remove "-audio" postfix from the compatible string
    of_match_table renamed consistently with the rest of the file (davinci_i2s_match)
    "channel-combine" property removed
    devicetree DMA configuration in probe simplified
v3: remove the unused platform data
v4: no change
v5: no change

 sound/soc/davinci/Kconfig       |  6 +++-
 sound/soc/davinci/davinci-i2s.c | 80 +++++++++++++++++++++++++++--------------
 2 files changed, 59 insertions(+), 27 deletions(-)

diff --git a/sound/soc/davinci/Kconfig b/sound/soc/davinci/Kconfig
index 50ca291cc225..6b732d8e5896 100644
--- a/sound/soc/davinci/Kconfig
+++ b/sound/soc/davinci/Kconfig
@@ -16,7 +16,11 @@ config SND_EDMA_SOC
 	  - DRA7xx family
 
 config SND_DAVINCI_SOC_I2S
-	tristate
+	tristate "DaVinci Multichannel Buffered Serial Port (McBSP) support"
+	depends on SND_EDMA_SOC
+	help
+	  Say Y or M here if you want to have support for McBSP IP found in
+	  Texas Instruments DaVinci DA850 SoCs.
 
 config SND_DAVINCI_SOC_MCASP
 	tristate "Multichannel Audio Serial Port (McASP) support"
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index ec98548a5fc9..384961651904 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -4,9 +4,15 @@
  * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
  * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
  *
+ * DT support	(c) 2016 Petr Kulhavy, Barix AG <petr@barix.com>
+ *		based on davinci-mcasp.c DT support
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
+ *
+ * TODO:
+ * on DA850 implement HW FIFOs instead of DMA into DXR and DRR registers
  */
 
 #include <linux/init.h>
@@ -650,13 +656,24 @@ static const struct snd_soc_component_driver davinci_i2s_component = {
 
 static int davinci_i2s_probe(struct platform_device *pdev)
 {
+	struct snd_dmaengine_dai_dma_data *dma_data;
 	struct davinci_mcbsp_dev *dev;
 	struct resource *mem, *res;
 	void __iomem *io_base;
 	int *dma;
 	int ret;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
+	if (!mem) {
+		dev_warn(&pdev->dev,
+			 "\"mpu\" mem resource not found, using index 0\n");
+		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		if (!mem) {
+			dev_err(&pdev->dev, "no mem resource?\n");
+			return -ENODEV;
+		}
+	}
+
 	io_base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(io_base))
 		return PTR_ERR(io_base);
@@ -666,39 +683,43 @@ static int davinci_i2s_probe(struct platform_device *pdev)
 	if (!dev)
 		return -ENOMEM;
 
-	dev->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dev->clk))
-		return -ENODEV;
-	clk_enable(dev->clk);
-
 	dev->base = io_base;
 
-	dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
-	    (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
+	/* setup DMA, first TX, then RX */
+	dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
+	dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
 
-	dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
-	    (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
-
-	/* first TX, then RX */
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no DMA resource\n");
-		ret = -ENXIO;
-		goto err_release_clk;
+	if (res) {
+		dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
+		*dma = res->start;
+		dma_data->filter_data = dma;
+	} else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+		dma_data->filter_data = "tx";
+	} else {
+		dev_err(&pdev->dev, "Missing DMA tx resource\n");
+		return -ENODEV;
 	}
-	dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
-	*dma = res->start;
-	dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data = dma;
+
+	dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
+	dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
 
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!res) {
-		dev_err(&pdev->dev, "no DMA resource\n");
-		ret = -ENXIO;
-		goto err_release_clk;
+	if (res) {
+		dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
+		*dma = res->start;
+		dma_data->filter_data = dma;
+	} else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+		dma_data->filter_data = "rx";
+	} else {
+		dev_err(&pdev->dev, "Missing DMA rx resource\n");
+		return -ENODEV;
 	}
-	dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
-	*dma = res->start;
-	dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data = dma;
+
+	dev->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk))
+		return -ENODEV;
+	clk_enable(dev->clk);
 
 	dev->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, dev);
@@ -737,11 +758,18 @@ static int davinci_i2s_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id davinci_i2s_match[] = {
+	{ .compatible = "ti,da850-mcbsp" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, davinci_i2s_match);
+
 static struct platform_driver davinci_mcbsp_driver = {
 	.probe		= davinci_i2s_probe,
 	.remove		= davinci_i2s_remove,
 	.driver		= {
 		.name	= "davinci-mcbsp",
+		.of_match_table = of_match_ptr(davinci_i2s_match),
 	},
 };
 
-- 
1.9.1

[PATCH v5 2/4] ASoC: Davinci: McBSP: add device tree support for McBSP

[Petr Kulhavy]

On 11.05.2016 16:57, Mark Brown wrote:
> On Mon, May 09, 2016 at 04:35:20PM +0200, Petr Kulhavy wrote:
>> This adds DT support for the TI DA8xx/OMAP-L1x/AM17xx/AM18xx McBSP driver.
>>
>> Signed-off-by: Petr Kulhavy <petr@barix.com>
>> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> How did this manage to get review but not the accompanying binding?
The whole set got reviewed by Peter in version 4 and the binding in v4 
got acked by Rob.
For the patches 2 and 3 which were taken over into version 5 without any 
modification I left the Reviewed-by tag there.
But since I made a (minor) modification in the binding example I removed 
Rob's ack.

Petr

[PATCH v5 3/4] ARM: davinci: da8xx-dt: add OF_DEV_AUXDATA entries for mcbsp0 and mcbsp1

[Petr Kulhavy]

Add OF_DEV_AUXDATA for mcbsp to be able to use clocks.

Signed-off-by: Petr Kulhavy <petr@barix.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
v1: initial
v2: remove "-audio" postfix from the compatible string
v3: no change
v4: no change
v5: rebased to the current master of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci.git

 arch/arm/mach-davinci/da8xx-dt.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index 754f478110b4..ae2bf237e374 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -35,8 +35,11 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("ns16550a", 0x01d0d000, "serial8250.2", NULL),
 	OF_DEV_AUXDATA("ti,davinci_mdio", 0x01e24000, "davinci_mdio.0", NULL),
 	OF_DEV_AUXDATA("ti,davinci-dm6467-emac", 0x01e20000, "davinci_emac.1",
-		       NULL),
-	OF_DEV_AUXDATA("ti,da830-mcasp-audio", 0x01d00000, "davinci-mcasp.0", NULL),
+			NULL),
+	OF_DEV_AUXDATA("ti,da830-mcasp-audio", 0x01d00000, "davinci-mcasp.0",
+			NULL),
+	OF_DEV_AUXDATA("ti,da850-mcbsp", 0x01d10000, "davinci-mcbsp.0", NULL),
+	OF_DEV_AUXDATA("ti,da850-mcbsp", 0x01d11000, "davinci-mcbsp.1", NULL),
 	{}
 };
 
-- 
1.9.1

[PATCH v5 4/4] ARM: DTS: da850: Add McBSP0 and McBSP1

[Petr Kulhavy]

Add SoC nodes for McBSP0 and McBSP1 as well as the corresponding pinmux
configurations.

Signed-off-by: Petr Kulhavy <petr@barix.com>
---
v1: initial
v2: add missing TC channel in dmas properties (for compatibility with the new EDMA3 binding)
    remove "-audio" postfix from the compatible string
v3: no change
v4: no change
v5: rebased to current master of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci.git
    using "sound@" prefix instead of "mcbsp@" prefix
    address corrected to match the reg value
    removed leading zeros from the reg values

 arch/arm/boot/dts/da850.dtsi | 45 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
index cf1aad8190f1..3a4450b7ae4a 100644
--- a/arch/arm/boot/dts/da850.dtsi
+++ b/arch/arm/boot/dts/da850.dtsi
@@ -166,7 +166,24 @@
 					0xc 0x88888888 0xffffffff
 				>;
 			};
-
+			mcbsp0_pins: pinmux_mcbsp0_pins {
+				pinctrl-single,bits = <
+					/* PINMUX2:
+					* CLKS0, DX0, DR0, FSX0
+					* FSR0, CLKX0, CLKR0
+					*/
+					0x8 0x02222220 0xfffffff0
+				>;
+			};
+			mcbsp1_pins: pinmux_mcbsp1_pins {
+				pinctrl-single,bits = <
+					/* PINMUX1:
+					* CLKS1, DX1, DR1, FSX1,
+					* FSR1, CLKX1, CLKR1
+					*/
+					0x4 0x22222220 0xfffffff0
+				>;
+			};
 		};
 		edma0: edma at 0 {
 			compatible = "ti,edma3-tpcc";
@@ -374,6 +391,32 @@
 				<&edma0 0 1>;
 			dma-names = "tx", "rx";
 		};
+
+		mcbsp0: sound at 110000 {
+			compatible = "ti,da850-mcbsp";
+			reg =	<0x110000 0x1000>,
+				<0x310000 0x1000>;
+			reg-names = "mpu", "dat";
+			interrupts = <97 98>;
+			interrupts-names = "rx", "tx";
+			dmas = <&edma0 3 1
+				&edma0 2 1>;
+			dma-names = "tx", "rx";
+			status = "disabled";
+		};
+		mcbsp1: sound at 111000 {
+			compatible = "ti,da850-mcbsp";
+			reg =	<0x111000 0x1000>,
+				<0x311000 0x1000>;
+			reg-names = "mpu", "dat";
+			interrupts = <99 100>;
+			interrupts-names = "rx", "tx";
+			dmas = <&edma0 5 1
+				&edma0 4 1>;
+			dma-names = "tx", "rx";
+			status = "disabled";
+		};
+
 	};
 	nand_cs3 at 62000000 {
 		compatible = "ti,davinci-nand";
-- 
1.9.1