ASoC: samsung: arndale: Add support for WM1811 CODEC

The Arndale boards come with different types of the audio daughter
board.  In order to support the WM1811 one we add new definition of
an ASoC card which will be registered when the driver matches on
"samsung,arndale-wm1811" compatible.  There is no runtime detection of
the audio daughter board type at the moment, compatible string of the
audio card needs to be adjusted in DT, e.g. by the bootloader,
depending on actual audio board (CODEC) used.
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Link: https://lore.kernel.org/r/20191002105652.24821-2-s.nawrocki@samsung.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/Kconfig

@@ -199,6 +199,8 @@ config SND_SOC_ARNDALE_RT5631_ALC5631
         depends on I2C
         select SND_SAMSUNG_I2S
         select SND_SOC_RT5631
+	select MFD_WM8994
+	select SND_SOC_WM8994
 
 config SND_SOC_SAMSUNG_TM2_WM5110
 	tristate "SoC I2S Audio support for WM5110 on TM2 board"

sound/soc/samsung/arndale_rt5631.c

@@ -14,9 +14,10 @@
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 
+#include "../codecs/wm8994.h"
 #include "i2s.h"
 
-static int arndale_hw_params(struct snd_pcm_substream *substream,
+static int arndale_rt5631_hw_params(struct snd_pcm_substream *substream,
 				    struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
@@ -47,13 +48,45 @@ static int arndale_hw_params(struct snd_pcm_substream *substream,
 	return 0;
 }
 
-static struct snd_soc_ops arndale_ops = {
-	.hw_params = arndale_hw_params,
+static struct snd_soc_ops arndale_rt5631_ops = {
+	.hw_params = arndale_rt5631_hw_params,
+};
+
+static int arndale_wm1811_hw_params(struct snd_pcm_substream *substream,
+				    struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	unsigned int rfs, rclk;
+
+	/* Ensure AIF1CLK is >= 3 MHz for optimal performance */
+	if (params_width(params) == 24)
+		rfs = 384;
+	else if (params_rate(params) == 8000 || params_rate(params) == 11025)
+		rfs = 512;
+	else
+		rfs = 256;
+
+	rclk = params_rate(params) * rfs;
+
+	/*
+	 * We add 1 to the frequency value to ensure proper EPLL setting
+	 * for each audio sampling rate (see epll_24mhz_tbl in drivers/clk/
+	 * samsung/clk-exynos5250.c for list of available EPLL rates).
+	 * The CODEC uses clk API and the value will be rounded hence the MCLK1
+	 * clock's frequency will still be exact multiple of the sample rate.
+	 */
+	return snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_MCLK1,
+					rclk + 1, SND_SOC_CLOCK_IN);
+}
+
+static struct snd_soc_ops arndale_wm1811_ops = {
+	.hw_params = arndale_wm1811_hw_params,
 };
 
 SND_SOC_DAILINK_DEFS(rt5631_hifi,
 	DAILINK_COMP_ARRAY(COMP_EMPTY()),
-	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "rt5631-hifi")),
+	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "rt5631-aif1")),
 	DAILINK_COMP_ARRAY(COMP_EMPTY()));
 
 static struct snd_soc_dai_link arndale_rt5631_dai[] = {
@@ -63,11 +96,28 @@ static struct snd_soc_dai_link arndale_rt5631_dai[] = {
 		.dai_fmt = SND_SOC_DAIFMT_I2S
 			| SND_SOC_DAIFMT_NB_NF
 			| SND_SOC_DAIFMT_CBS_CFS,
-		.ops = &arndale_ops,
+		.ops = &arndale_rt5631_ops,
 		SND_SOC_DAILINK_REG(rt5631_hifi),
 	},
 };
 
+SND_SOC_DAILINK_DEFS(wm1811_hifi,
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8994-aif1")),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link arndale_wm1811_dai[] = {
+	{
+		.name = "WM1811 HiFi",
+		.stream_name = "Primary",
+		.dai_fmt = SND_SOC_DAIFMT_I2S
+			| SND_SOC_DAIFMT_NB_NF
+			| SND_SOC_DAIFMT_CBM_CFM,
+		.ops = &arndale_wm1811_ops,
+		SND_SOC_DAILINK_REG(wm1811_hifi),
+	},
+};
+
 static struct snd_soc_card arndale_rt5631 = {
 	.name = "Arndale RT5631",
 	.owner = THIS_MODULE,
@@ -75,6 +125,13 @@ static struct snd_soc_card arndale_rt5631 = {
 	.num_links = ARRAY_SIZE(arndale_rt5631_dai),
 };
 
+static struct snd_soc_card arndale_wm1811 = {
+	.name = "Arndale WM1811",
+	.owner = THIS_MODULE,
+	.dai_link = arndale_wm1811_dai,
+	.num_links = ARRAY_SIZE(arndale_wm1811_dai),
+};
+
 static void arndale_put_of_nodes(struct snd_soc_card *card)
 {
 	struct snd_soc_dai_link *dai_link;
@@ -89,10 +146,11 @@ static void arndale_put_of_nodes(struct snd_soc_card *card)
 static int arndale_audio_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	struct snd_soc_card *card = &arndale_rt5631;
+	struct snd_soc_card *card;
 	struct snd_soc_dai_link *dai_link;
 	int ret;
 
+	card = (struct snd_soc_card *)of_device_get_match_data(&pdev->dev);
 	card->dev = &pdev->dev;
 	dai_link = card->dai_link;
 
@@ -134,18 +192,19 @@ static int arndale_audio_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id samsung_arndale_rt5631_of_match[] __maybe_unused = {
-	{ .compatible = "samsung,arndale-rt5631", },
-	{ .compatible = "samsung,arndale-alc5631", },
+static const struct of_device_id arndale_audio_of_match[] = {
+	{ .compatible = "samsung,arndale-rt5631",  .data = &arndale_rt5631 },
+	{ .compatible = "samsung,arndale-alc5631", .data = &arndale_rt5631 },
+	{ .compatible = "samsung,arndale-wm1811",  .data = &arndale_wm1811 },
 	{},
 };
-MODULE_DEVICE_TABLE(of, samsung_arndale_rt5631_of_match);
+MODULE_DEVICE_TABLE(of, arndale_audio_of_match);
 
 static struct platform_driver arndale_audio_driver = {
 	.driver = {
 		.name = "arndale-audio",
 		.pm = &snd_soc_pm_ops,
-		.of_match_table = of_match_ptr(samsung_arndale_rt5631_of_match),
+		.of_match_table = arndale_audio_of_match,
 	},
 	.probe = arndale_audio_probe,
 	.remove = arndale_audio_remove,