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From:   Akshu Agrawal <akshu.agrawal@amd.com>
Cc:     djkurtz@chromium.org, akshu.agrawal@amd.com,
        Alexander.Deucher@amd.com, Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Dylan Reid <dgreid@chromium.org>,
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        Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
        Wei Yongjun <weiyongjun1@huawei.com>,
        alsa-devel@alsa-project.org (moderated list:SOUND - SOC LAYER / DYNAMIC
        AUDIO POWER MANAGEM...), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] ASoC: AMD: Add a fix voltage regulator for DA7219 and ADAU7002
Date:   Fri, 20 Jul 2018 14:38:11 +0800
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DA7219 for our platform need to be configured for 1.8V.
Hence, we add a fixed volatge regulator with supplies
of 1.8V in the machine driver.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
---
 sound/soc/amd/Kconfig                |  2 ++
 sound/soc/amd/acp-da7219-max98357a.c | 45 ++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/sound/soc/amd/Kconfig b/sound/soc/amd/Kconfig
index 6cbf9cf..c447a51 100644
--- a/sound/soc/amd/Kconfig
+++ b/sound/soc/amd/Kconfig
@@ -8,6 +8,8 @@ config SND_SOC_AMD_CZ_DA7219MX98357_MACH
 	select SND_SOC_DA7219
 	select SND_SOC_MAX98357A
 	select SND_SOC_ADAU7002
+	select REGULATOR
+	select REGULATOR_FIXED_VOLTAGE
 	depends on SND_SOC_AMD_ACP && I2C
 	help
 	 This option enables machine driver for DA7219 and MAX9835.
diff --git a/sound/soc/amd/acp-da7219-max98357a.c b/sound/soc/amd/acp-da7219-max98357a.c
index f42606e..fdf8972 100644
--- a/sound/soc/amd/acp-da7219-max98357a.c
+++ b/sound/soc/amd/acp-da7219-max98357a.c
@@ -31,7 +31,10 @@
 #include <sound/jack.h>
 #include <linux/clk.h>
 #include <linux/gpio.h>
+#include <linux/platform_device.h>
 #include <linux/module.h>
+#include <linux/regulator/fixed.h>
+#include <linux/regulator/machine.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
 #include <linux/acpi.h>
@@ -320,11 +323,53 @@ static void cz_dmic_shutdown(struct snd_pcm_substream *substream)
 	.num_controls = ARRAY_SIZE(cz_mc_controls),
 };
 
+static struct regulator_consumer_supply acp_da7219_supplies[] = {
+	REGULATOR_SUPPLY("VDD", "i2c-DLGS7219:00"),
+	REGULATOR_SUPPLY("VDDMIC", "i2c-DLGS7219:00"),
+	REGULATOR_SUPPLY("VDDIO", "i2c-DLGS7219:00"),
+	REGULATOR_SUPPLY("IOVDD", "ADAU7002:00"),
+};
+
+static struct regulator_init_data acp_da7219_data = {
+	.constraints = {
+		.always_on = 1,
+	},
+	.num_consumer_supplies = ARRAY_SIZE(acp_da7219_supplies),
+	.consumer_supplies = acp_da7219_supplies,
+};
+
+static struct fixed_voltage_config acp_da7219 = {
+	.supply_name = "reg-fixed-1.8V",
+	.microvolts = 1800000, /* 1.8V */
+	.gpio = -EINVAL,
+	.enabled_at_boot = 1,
+	.init_data = &acp_da7219_data,
+};
+
+static struct platform_device acp_da7219_regulator = {
+	.name = "reg-fixed-voltage",
+	.id = PLATFORM_DEVID_AUTO,
+	.dev = {
+		.platform_data = &acp_da7219,
+	},
+};
+
 static int cz_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct snd_soc_card *card;
 	struct acp_platform_info *machine;
+	static bool regulators_registered;
+
+	if (!regulators_registered) {
+		ret = platform_device_register(&acp_da7219_regulator);
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to register regulator: %d\n",
+				ret);
+			return ret;
+		}
+		regulators_registered = true;
+	}
 
 	machine = devm_kzalloc(&pdev->dev, sizeof(struct acp_platform_info),
 			       GFP_KERNEL);
-- 
1.9.1