MLK-15004-1: ASoC: codec: cs42xx8: Add reset gpio of codec

Need to set the reset pin high when running, otherwise the chip
will remain in reset state.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>

diff --git a/sound/soc/codecs/cs42xx8.c b/sound/soc/codecs/cs42xx8.c
index 7d2c921..04e94fb 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 {
        unsigned long sysclk;
        u32 tx_channels;
        int rate[2];
+       int reset_gpio;
 };
 
 /* -127.5dB to 0dB with step of 0.5dB */
@@ -504,7 +506,8 @@ EXPORT_SYMBOL_GPL(cs42xx8_of_match);
 
 int cs42xx8_probe(struct device *dev, struct regmap *regmap)
 {
-       const struct of_device_id *of_id;
+       const struct of_device_id *of_id = of_match_device(cs42xx8_of_match, dev);
+       struct device_node *np = dev->of_node;
        struct cs42xx8_priv *cs42xx8;
        int ret, val, i;
 
@@ -530,6 +533,16 @@ int cs42xx8_probe(struct device *dev, struct regmap *regmap)
                return -EINVAL;
        }
 
+       cs42xx8->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
+       if (gpio_is_valid(cs42xx8->reset_gpio)) {
+               ret = devm_gpio_request_one(dev, cs42xx8->reset_gpio,
+                               GPIOF_OUT_INIT_HIGH, "cs42xx8 reset");
+               if (ret) {
+                       dev_err(dev, "unable to get reset gpio\n");
+                       return ret;
+               }
+       }
+
        cs42xx8->clk = devm_clk_get(dev, "mclk");
        if (IS_ERR(cs42xx8->clk)) {
                dev_err(dev, "failed to get the clock: %ld\n",
@@ -619,6 +632,9 @@ static int cs42xx8_runtime_resume(struct device *dev)
                return ret;
        }
 
+       if (gpio_is_valid(cs42xx8->reset_gpio))
+               gpio_set_value_cansleep(cs42xx8->reset_gpio, 1);
+
        ret = regulator_bulk_enable(ARRAY_SIZE(cs42xx8->supplies),
                                    cs42xx8->supplies);
        if (ret) {