[PATCH 0/2] ASoC: Add support for MikroElektronika PROTO codec

[PATCH 0/2] ASoC: Add support for MikroElektronika PROTO codec

[Codrin Ciubotariu]

This patchset is based on Florian's initial PROTO driver:
https://lkml.org/lkml/2013/5/22/342

My changes made the driver more generic, so that we could connect other
I2S CPU DAIs, by using device-tree.

Tested with sama5d2 I2S driver.

Codrin Ciubotariu (2):
  ASoC: Add driver for PROTO Audio CODEC (with a WM8731)
  ASoC: mikroe-proto: dt-bindings: add DT bindings for PROTO board

 .../bindings/sound/mikroe,mikroe-proto.txt    |  23 +++
 .../devicetree/bindings/vendor-prefixes.txt   |   1 +
 sound/soc/atmel/Kconfig                       |   7 +
 sound/soc/atmel/Makefile                      |   2 +
 sound/soc/atmel/mikroe-proto.c                | 189 ++++++++++++++++++
 5 files changed, 222 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/mikroe,mikroe-proto.txt
 create mode 100644 sound/soc/atmel/mikroe-proto.c

-- 
2.17.1

[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[Codrin Ciubotariu]

Add support for the MikroElektronika PROTO audio codec board.

URL to the audio chip:
http://www.mikroe.com/add-on-boards/audio-voice/audio-codec-proto/

Signed-off-by: Florian Meier <florian.meier@koalo.de>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
---
 sound/soc/atmel/Kconfig        |   7 ++
 sound/soc/atmel/Makefile       |   2 +
 sound/soc/atmel/mikroe-proto.c | 189 +++++++++++++++++++++++++++++++++
 3 files changed, 198 insertions(+)
 create mode 100644 sound/soc/atmel/mikroe-proto.c

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 539ef33e670a..fbf4d3e42c18 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -97,4 +97,11 @@ config SND_ATMEL_SOC_I2S
 	help
 	  Say Y or M if you want to add support for Atmel ASoc driver for boards
 	  using I2S.
+
+config SND_SOC_MIKROE_PROTO
+	tristate "Support for Mikroe-PROTO board"
+	depends on OF
+	select SND_SOC_WM8731
+	help
+	  Say Y or M if you want to add support for Audio Codec Board PROTO (WM8731).
 endif
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index cd87cb4bcff5..9f41bfa0fea3 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -17,6 +17,7 @@ snd-soc-sam9x5-wm8731-objs := sam9x5_wm8731.o
 snd-atmel-soc-classd-objs := atmel-classd.o
 snd-atmel-soc-pdmic-objs := atmel-pdmic.o
 snd-atmel-soc-tse850-pcm5142-objs := tse850-pcm5142.o
+snd-soc-mikroe-proto-objs := mikroe-proto.o
 
 obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o
 obj-$(CONFIG_SND_ATMEL_SOC_WM8904) += snd-atmel-soc-wm8904.o
@@ -24,3 +25,4 @@ obj-$(CONFIG_SND_AT91_SOC_SAM9X5_WM8731) += snd-soc-sam9x5-wm8731.o
 obj-$(CONFIG_SND_ATMEL_SOC_CLASSD) += snd-atmel-soc-classd.o
 obj-$(CONFIG_SND_ATMEL_SOC_PDMIC) += snd-atmel-soc-pdmic.o
 obj-$(CONFIG_SND_ATMEL_SOC_TSE850_PCM5142) += snd-atmel-soc-tse850-pcm5142.o
+obj-$(CONFIG_SND_SOC_MIKROE_PROTO) += snd-soc-mikroe-proto.o
diff --git a/sound/soc/atmel/mikroe-proto.c b/sound/soc/atmel/mikroe-proto.c
new file mode 100644
index 000000000000..9d9dc1c8ac6b
--- /dev/null
+++ b/sound/soc/atmel/mikroe-proto.c
@@ -0,0 +1,189 @@
+/*
+ * ASoC driver for PROTO AudioCODEC (with a WM8731)
+ *
+ * Author:      Florian Meier, <koalo@koalo.de>
+ *	      Copyright 2013
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+#include "../codecs/wm8731.h"
+
+#define XTAL_RATE 12288000	/* This is fixed on this board */
+
+static const unsigned int wm8731_rates_12288000[] = {
+	8000, 32000, 48000, 96000,
+};
+
+static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
+	.list = wm8731_rates_12288000,
+	.count = ARRAY_SIZE(wm8731_rates_12288000),
+};
+
+static int snd_proto_startup(struct snd_pcm_substream *substream)
+{
+	/* Setup constraints, because there is a 12.288 MHz XTAL on the board */
+	snd_pcm_hw_constraint_list(substream->runtime, 0,
+				   SNDRV_PCM_HW_PARAM_RATE,
+				   &wm8731_constraints_12288000);
+	return 0;
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_proto_ops = {
+	.startup = snd_proto_startup,
+};
+
+static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+	/* Set proto sysclk */
+	int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
+					 XTAL_RATE, SND_SOC_CLOCK_IN);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dapm_widget snd_proto_widget[] = {
+	SND_SOC_DAPM_MIC("Microphone Jack", NULL),
+	SND_SOC_DAPM_HP("Headphone Jack", NULL),
+};
+
+static const struct snd_soc_dapm_route snd_proto_route[] = {
+	/* speaker connected to LHPOUT/RHPOUT */
+	{"Headphone Jack", NULL, "LHPOUT"},
+	{"Headphone Jack", NULL, "RHPOUT"},
+
+	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
+	{"MICIN", NULL, "Mic Bias"},
+	{"Mic Bias", NULL, "Microphone Jack"},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_proto = {
+	.name		= "snd_mikroe_proto",
+	.owner		= THIS_MODULE,
+	.dapm_widgets	= snd_proto_widget,
+	.num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
+	.dapm_routes	= snd_proto_route,
+	.num_dapm_routes = ARRAY_SIZE(snd_proto_route),
+};
+
+static int snd_proto_probe(struct platform_device *pdev)
+{
+	struct snd_soc_dai_link *dai;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *codec_np, *cpu_np;
+	struct device_node *bitclkmaster = NULL;
+	struct device_node *framemaster = NULL;
+	unsigned int dai_fmt;
+	int ret = 0;
+
+	if (!np) {
+		dev_err(&pdev->dev, "No device node supplied\n");
+		return -EINVAL;
+	}
+
+	snd_proto.dev = &pdev->dev;
+	ret = snd_soc_of_parse_card_name(&snd_proto, "model");
+	if (ret)
+		return ret;
+
+	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
+	if (!dai)
+		return -ENOMEM;
+
+	snd_proto.dai_link = dai;
+	snd_proto.num_links = 1;
+
+	dai->name = "WM8731";
+	dai->stream_name = "WM8731 HiFi";
+	dai->codec_dai_name = "wm8731-hifi";
+	dai->init = &snd_proto_init;
+	dai->ops = &snd_proto_ops;
+
+	codec_np = of_parse_phandle(np, "audio-codec", 0);
+	if (!codec_np) {
+		dev_err(&pdev->dev, "audio-codec node missing\n");
+		return -EINVAL;
+	}
+	dai->codec_of_node = codec_np;
+
+	cpu_np = of_parse_phandle(np, "i2s-controller", 0);
+	if (!cpu_np) {
+		dev_err(&pdev->dev, "i2s-controller missing\n");
+		return -EINVAL;
+	}
+	dai->cpu_of_node = cpu_np;
+	dai->platform_of_node = cpu_np;
+
+	dai_fmt = snd_soc_of_parse_daifmt(np, NULL,
+					  &bitclkmaster, &framemaster);
+	if (bitclkmaster != framemaster) {
+		dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
+		return -EINVAL;
+	}
+	if (bitclkmaster) {
+		dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
+		if (codec_np == bitclkmaster)
+			dai_fmt |= SND_SOC_DAIFMT_CBM_CFM;
+		else
+			dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
+	}
+	of_node_put(bitclkmaster);
+	of_node_put(framemaster);
+	dai->dai_fmt = dai_fmt;
+
+	of_node_put(codec_np);
+	of_node_put(cpu_np);
+
+	ret = snd_soc_register_card(&snd_proto);
+	if (ret && ret != -EPROBE_DEFER)
+		dev_err(&pdev->dev,
+			"snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static int snd_proto_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_proto);
+}
+
+static const struct of_device_id snd_proto_of_match[] = {
+	{ .compatible = "mikroe,mikroe-proto", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, snd_proto_of_match);
+
+static struct platform_driver snd_proto_driver = {
+	.driver = {
+		.name   = "snd-mikroe-proto",
+		.owner  = THIS_MODULE,
+		.of_match_table = snd_proto_of_match,
+	},
+	.probe	  = snd_proto_probe,
+	.remove	 = snd_proto_remove,
+};
+
+module_platform_driver(snd_proto_driver);
+
+MODULE_AUTHOR("Florian Meier");
+MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
+MODULE_LICENSE("GPL");
-- 
2.17.1

[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[Mark Brown]

On Wed, Aug 29, 2018 at 05:47:26PM +0300, Codrin Ciubotariu wrote:

> +static const unsigned int wm8731_rates_12288000[] = {
> +	8000, 32000, 48000, 96000,
> +};
> +
> +static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
> +	.list = wm8731_rates_12288000,
> +	.count = ARRAY_SIZE(wm8731_rates_12288000),
> +};
> +
> +static int snd_proto_startup(struct snd_pcm_substream *substream)
> +{
> +	/* Setup constraints, because there is a 12.288 MHz XTAL on the board */
> +	snd_pcm_hw_constraint_list(substream->runtime, 0,
> +				   SNDRV_PCM_HW_PARAM_RATE,
> +				   &wm8731_constraints_12288000);
> +	return 0;
> +}

This bit is better added to the CODEC driver since it'll apply to any
system where there's this clock rate (someone else could come in and add
other rates, no need to do that yourself though it'd be nice of course).

That also has the nice bonus that with that I think you'd be able to use
the graph card rather than a custom driver?
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[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[Codrin Ciubotariu]

On 29.08.2018 17:53, Mark Brown wrote:
> On Wed, Aug 29, 2018 at 05:47:26PM +0300, Codrin Ciubotariu wrote:
> 
>> +static const unsigned int wm8731_rates_12288000[] = {
>> +	8000, 32000, 48000, 96000,
>> +};
>> +
>> +static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
>> +	.list = wm8731_rates_12288000,
>> +	.count = ARRAY_SIZE(wm8731_rates_12288000),
>> +};
>> +
>> +static int snd_proto_startup(struct snd_pcm_substream *substream)
>> +{
>> +	/* Setup constraints, because there is a 12.288 MHz XTAL on the board */
>> +	snd_pcm_hw_constraint_list(substream->runtime, 0,
>> +				   SNDRV_PCM_HW_PARAM_RATE,
>> +				   &wm8731_constraints_12288000);
>> +	return 0;
>> +}
> 
> This bit is better added to the CODEC driver since it'll apply to any
> system where there's this clock rate (someone else could come in and add
> other rates, no need to do that yourself though it'd be nice of course).

I could do it.

> 
> That also has the nice bonus that with that I think you'd be able to use
> the graph card rather than a custom driver?

The main reason for adding a custom driver and not using graph/simple 
card is the snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, 
                              XTAL_RATE, SND_SOC_CLOCK_IN) call. This 
enables the oscillator found in the wm8731 codec. Since 
WM8731_SYSCLK_XTAL is not 0, we can't use system-clock-frequency DT 
property to set it.

Best regards,
Codrin

[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[Mark Brown]

On Wed, Aug 29, 2018 at 06:20:59PM +0300, Codrin Ciubotariu wrote:
> On 29.08.2018 17:53, Mark Brown wrote:

> > That also has the nice bonus that with that I think you'd be able to use
> > the graph card rather than a custom driver?

> The main reason for adding a custom driver and not using graph/simple card
> is the snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
> XTAL_RATE, SND_SOC_CLOCK_IN) call. This enables the oscillator found in the
> wm8731 codec. Since WM8731_SYSCLK_XTAL is not 0, we can't use
> system-clock-frequency DT property to set it.

Right, that'd be more substantial surgery on the driver to change the DT
binding so that it's got a clock provider in it; it'd be nice to do but
it's a bit much to make it a blocker so the machine driver is OK.
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[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[Codrin Ciubotariu]

On 29.08.2018 18:20, Codrin Ciubotariu wrote:
> On 29.08.2018 17:53, Mark Brown wrote:
>> On Wed, Aug 29, 2018 at 05:47:26PM +0300, Codrin Ciubotariu wrote:
>>
>>> +static const unsigned int wm8731_rates_12288000[] = {
>>> +??? 8000, 32000, 48000, 96000,
>>> +};
>>> +
>>> +static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 
>>> = {
>>> +??? .list = wm8731_rates_12288000,
>>> +??? .count = ARRAY_SIZE(wm8731_rates_12288000),
>>> +};
>>> +
>>> +static int snd_proto_startup(struct snd_pcm_substream *substream)
>>> +{
>>> +??? /* Setup constraints, because there is a 12.288 MHz XTAL on the 
>>> board */
>>> +??? snd_pcm_hw_constraint_list(substream->runtime, 0,
>>> +?????????????????? SNDRV_PCM_HW_PARAM_RATE,
>>> +?????????????????? &wm8731_constraints_12288000);
>>> +??? return 0;
>>> +}
>>
>> This bit is better added to the CODEC driver since it'll apply to any
>> system where there's this clock rate (someone else could come in and add
>> other rates, no need to do that yourself though it'd be nice of course).
> 
> I could do it.

It looks like these constraints are already in the wm8731 driver. I will 
wait for more comments and then I will send a v2 without this part.

Thanks and best regards,
Codrin

[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[kbuild test robot]

Hi Codrin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on at91/at91-next]
[also build test ERROR on v4.19-rc1 next-20180829]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Codrin-Ciubotariu/ASoC-Add-driver-for-PROTO-Audio-CODEC-with-a-WM8731/20180830-060610
base:   https://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91.git at91-next
config: i386-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   sound/soc/atmel/mikroe-proto.c: In function 'snd_proto_init':
>> sound/soc/atmel/mikroe-proto.c:49:35: error: 'struct snd_soc_pcm_runtime' has no member named 'codec'
     struct snd_soc_codec *codec = rtd->codec;
                                      ^~
>> sound/soc/atmel/mikroe-proto.c:56:16: error: dereferencing pointer to incomplete type 'struct snd_soc_codec'
      dev_err(codec->dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
                   ^~

vim +49 sound/soc/atmel/mikroe-proto.c

    46	
    47	static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
    48	{
  > 49		struct snd_soc_codec *codec = rtd->codec;
    50		struct snd_soc_dai *codec_dai = rtd->codec_dai;
    51	
    52		/* Set proto sysclk */
    53		int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
    54						 XTAL_RATE, SND_SOC_CLOCK_IN);
    55		if (ret < 0) {
  > 56			dev_err(codec->dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
    57			return ret;
    58		}
    59	
    60		return 0;
    61	}
    62	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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[PATCH 1/2] ASoC: Add driver for PROTO Audio CODEC (with a WM8731)

[kbuild test robot]

Hi Codrin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on at91/at91-next]
[also build test WARNING on v4.19-rc1 next-20180830]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Codrin-Ciubotariu/ASoC-Add-driver-for-PROTO-Audio-CODEC-with-a-WM8731/20180830-060610
base:   https://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91.git at91-next


coccinelle warnings: (new ones prefixed by >>)

>> sound/soc/atmel/mikroe-proto.c:178:3-8: No need to set .owner here. The core will do it.

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[PATCH] ASoC: fix platform_no_drv_owner.cocci warnings

[kbuild test robot]

From: kbuild test robot <fengguang.wu@intel.com>

sound/soc/atmel/mikroe-proto.c:178:3-8: No need to set .owner here. The core will do it.

 Remove .owner field if calls are used which set it automatically

Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci

Fixes: 395c2cec021d ("ASoC: Add driver for PROTO Audio CODEC (with a WM8731)")
CC: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: kbuild test robot <fengguang.wu@intel.com>
---

url:    https://github.com/0day-ci/linux/commits/Codrin-Ciubotariu/ASoC-Add-driver-for-PROTO-Audio-CODEC-with-a-WM8731/20180830-060610
base:   https://git.kernel.org/pub/scm/linux/kernel/git/nferre/linux-at91.git at91-next

 mikroe-proto.c |    1 -
 1 file changed, 1 deletion(-)

--- a/sound/soc/atmel/mikroe-proto.c
+++ b/sound/soc/atmel/mikroe-proto.c
@@ -175,7 +175,6 @@ MODULE_DEVICE_TABLE(of, snd_proto_of_mat
 static struct platform_driver snd_proto_driver = {
 	.driver = {
 		.name   = "snd-mikroe-proto",
-		.owner  = THIS_MODULE,
 		.of_match_table = snd_proto_of_match,
 	},
 	.probe	  = snd_proto_probe,

[PATCH 2/2] ASoC: mikroe-proto: dt-bindings: add DT bindings for PROTO board

[Codrin Ciubotariu]

DT binding documentation for this new ASoC driver.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
---
 .../bindings/sound/mikroe,mikroe-proto.txt    | 23 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.txt   |  1 +
 2 files changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/mikroe,mikroe-proto.txt

diff --git a/Documentation/devicetree/bindings/sound/mikroe,mikroe-proto.txt b/Documentation/devicetree/bindings/sound/mikroe,mikroe-proto.txt
new file mode 100644
index 000000000000..912f8fae11c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mikroe,mikroe-proto.txt
@@ -0,0 +1,23 @@
+Mikroe-PROTO audio board
+
+Required properties:
+  - compatible: "mikroe,mikroe-proto"
+  - dai-format: Must be "i2s".
+  - i2s-controller: The phandle of the I2S controller.
+  - audio-codec: The phandle of the WM8731 audio codec.
+Optional properties:
+  - model: The user-visible name of this sound complex.
+  - bitclock-master: Indicates dai-link bit clock master; for details see simple-card.txt (1).
+  - frame-master: Indicates dai-link frame master; for details see simple-card.txt (1).
+
+(1) : There must be the same master for both bit and frame clocks.
+
+Example:
+	sound {
+		compatible = "mikroe,mikroe-proto";
+		model = "wm8731 @ sama5d2_xplained";
+		i2s-controller = <&i2s0>;
+		audio-codec = <&wm8731>;
+		dai-format = "i2s";
+        };
+};
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index f4a98c85340a..8ac3ec1f36e5 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -210,6 +210,7 @@ micron	Micron Technology Inc.
 minix	MINIX Technology Ltd.
 miramems	MiraMEMS Sensing Technology Co., Ltd.
 mitsubishi	Mitsubishi Electric Corporation
+mikroe		MikroElektronika d.o.o.
 mosaixtech	Mosaix Technologies, Inc.
 motorola	Motorola, Inc.
 moxa	Moxa Inc.
-- 
2.17.1