ASoC: cs42xx8: Add reset gpio handling

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

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/cs42xx8.c b/sound/soc/codecs/cs42xx8.c
index ebb9e0cf83647b80fae1b9949fcd04e556ba9eed..3e8dbf63adbe42484c9db2898197601a5decc7f6 100644 (file)
--- 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) {
@@ -585,6 +596,8 @@ 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;