[alsa-devel] [PATCH] ASoC: cs42xx8: Add reset gpio handling

[S.j. Wang]

Handle the reset GPIO and reset the device in
pm_runtime_resume

Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
---
 sound/soc/codecs/cs42xx8.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sound/soc/codecs/cs42xx8.c b/sound/soc/codecs/cs42xx8.c
index ebb9e0cf8364..fc28e6d26c6d 100644
--- a/sound/soc/codecs/cs42xx8.c
+++ b/sound/soc/codecs/cs42xx8.c
@@ -14,6 +14,7 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <sound/pcm_params.h>
@@ -45,6 +46,7 @@ struct cs42xx8_priv {
 	bool slave_mode;
 	unsigned long sysclk;
 	u32 tx_channels;
+	int gpio_reset;
 };
 
 /* -127.5dB to 0dB with step of 0.5dB */
@@ -467,6 +469,17 @@ int cs42xx8_probe(struct device *dev, struct regmap *regmap)
 		return -EINVAL;
 	}
 
+	cs42xx8->gpio_reset = of_get_named_gpio(dev->of_node, "gpio-reset", 0);
+	if (gpio_is_valid(cs42xx8->gpio_reset)) {
+		ret = devm_gpio_request_one(dev, cs42xx8->gpio_reset,
+				GPIOF_OUT_INIT_LOW, "cs42xx8 reset");
+		if (ret) {
+			dev_err(dev, "unable to get reset gpio\n");
+			return ret;
+		}
+		gpio_set_value_cansleep(cs42xx8->gpio_reset, 1);
+	}
+
 	cs42xx8->clk = devm_clk_get(dev, "mclk");
 	if (IS_ERR(cs42xx8->clk)) {
 		dev_err(dev, "failed to get the clock: %ld\n",
@@ -547,6 +560,11 @@ static int cs42xx8_runtime_resume(struct device *dev)
 		return ret;
 	}
 
+	if (gpio_is_valid(cs42xx8->gpio_reset)) {
+		gpio_set_value_cansleep(cs42xx8->gpio_reset, 0);
+		gpio_set_value_cansleep(cs42xx8->gpio_reset, 1);
+	}
+
 	ret = regulator_bulk_enable(ARRAY_SIZE(cs42xx8->supplies),
 				    cs42xx8->supplies);
 	if (ret) {
@@ -559,6 +577,7 @@ static int cs42xx8_runtime_resume(struct device *dev)
 
 	regcache_cache_only(cs42xx8->regmap, false);
 
+	regcache_mark_dirty(cs42xx8->regmap);
 	ret = regcache_sync(cs42xx8->regmap);
 	if (ret) {
 		dev_err(dev, "failed to sync regmap: %d\n", ret);
-- 
1.9.1