[V2] ASoC: cs42xx8: Add reset gpio handling

Commit Message

Shengjiu Wang May 16, 2019, 6:04 a.m. UTC

Handle the reset GPIO and reset the device every time we
start it.

Signed-off-by: Shengjiu Wang <[e-mail]>
---
Changes in v2
- use devm_gpiod_get_optional instead of of_get_named_gpio

 sound/soc/codecs/cs42xx8.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Comments

Mark Brown May 16, 2019, 10:11 a.m. UTC | #1

On Thu, May 16, 2019 at 06:04:58AM +0000, S.j. Wang wrote:

> +	cs42xx8->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
> +							GPIOD_OUT_HIGH);
> +	if (IS_ERR(cs42xx8->gpiod_reset))
> +		return PTR_ERR(cs42xx8->gpiod_reset);

You also need a binding document update for this.

Patch

diff --git a/sound/soc/codecs/cs42xx8.c b/sound/soc/codecs/cs42xx8.c
index 28a4ac36c4f8..b377cddaf2e6 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;
+	struct gpio_desc *gpiod_reset;
 };
 
 /* -127.5dB to 0dB with step of 0.5dB */
@@ -467,6 +469,13 @@  int cs42xx8_probe(struct device *dev, struct regmap *regmap)
 		return -EINVAL;
 	}
 
+	cs42xx8->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
+							GPIOD_OUT_HIGH);
+	if (IS_ERR(cs42xx8->gpiod_reset))
+		return PTR_ERR(cs42xx8->gpiod_reset);
+
+	gpiod_set_value_cansleep(cs42xx8->gpiod_reset, 0);
+
 	cs42xx8->clk = devm_clk_get(dev, "mclk");
 	if (IS_ERR(cs42xx8->clk)) {
 		dev_err(dev, "failed to get the clock: %ld\n",
@@ -547,6 +556,8 @@  static int cs42xx8_runtime_resume(struct device *dev)
 		return ret;
 	}
 
+	gpiod_set_value_cansleep(cs42xx8->gpiod_reset, 0);
+
 	ret = regulator_bulk_enable(ARRAY_SIZE(cs42xx8->supplies),
 				    cs42xx8->supplies);
 	if (ret) {
@@ -586,6 +597,8 @@  static int cs42xx8_runtime_suspend(struct device *dev)
 	regulator_bulk_disable(ARRAY_SIZE(cs42xx8->supplies),
 			       cs42xx8->supplies);
 
+	gpiod_set_value_cansleep(cs42xx8->gpiod_reset, 1);
+
 	clk_disable_unprepare(cs42xx8->clk);
 
 	return 0;