Handle the reset GPIO and reset the device every time we
start it.
Signed-off-by: Shengjiu Wang <[email protected]>
---
Changes in v3
- update binding document.
Changes in v2
- use devm_gpiod_get_optional instead of of_get_named_gpio
Documentation/devicetree/bindings/sound/cs42xx8.txt | 6 ++++++
sound/soc/codecs/cs42xx8.c | 13 +++++++++++++
2 files changed, 19 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/cs42xx8.txt b/Documentation/devicetree/bindings/sound/cs42xx8.txt
index 8619a156d038..ab8f54095269 100644
--- a/Documentation/devicetree/bindings/sound/cs42xx8.txt
+++ b/Documentation/devicetree/bindings/sound/cs42xx8.txt
@@ -14,6 +14,11 @@ Required properties:
- VA-supply, VD-supply, VLS-supply, VLC-supply: power supplies for the device,
as covered in Documentation/devicetree/bindings/regulator/regulator.txt
+Optional properties:
+
+ - reset-gpio : a GPIO spec to define which pin is connected to the chip's
+ !RESET pin
+
Example:
cs42888: codec@48 {
@@ -25,4 +30,5 @@ cs42888: codec@48 {
VD-supply = <®_audio>;
VLS-supply = <®_audio>;
VLC-supply = <®_audio>;
+ reset-gpio = <&pca9557_b 1 1>;
};
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;
--
2.21.0