The RST (reset-gpios) is low active so the driver must handle it
accordingly.
Add comments to explain clearly how the line is used.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
sound/soc/codecs/pcm3168a.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/sound/soc/codecs/pcm3168a.c b/sound/soc/codecs/pcm3168a.c
index f3475134b519..9711fab296eb 100644
--- a/sound/soc/codecs/pcm3168a.c
+++ b/sound/soc/codecs/pcm3168a.c
@@ -707,11 +707,15 @@ int pcm3168a_probe(struct device *dev, struct regmap *regmap)
dev_set_drvdata(dev, pcm3168a);
/*
- * Request the RST gpio line as non exclusive as the same reset line
- * might be connected to multiple pcm3168a codec
+ * Request the reset (connected to RST pin) gpio line as non exclusive
+ * as the same reset line might be connected to multiple pcm3168a codec
+ *
+ * The RST is low active, we want the GPIO line to be high initially, so
+ * request the initial level to LOW which in practice means DEASSERTED:
+ * The deasserted level of GPIO_ACTIVE_LOW is HIGH.
*/
- pcm3168a->gpio_rst = devm_gpiod_get_optional(dev, "rst",
- GPIOD_OUT_HIGH |
+ pcm3168a->gpio_rst = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_LOW |
GPIOD_FLAGS_BIT_NONEXCLUSIVE);
if (IS_ERR(pcm3168a->gpio_rst)) {
ret = PTR_ERR(pcm3168a->gpio_rst);
@@ -814,7 +818,13 @@ void pcm3168a_remove(struct device *dev)
{
struct pcm3168a_priv *pcm3168a = dev_get_drvdata(dev);
- gpiod_set_value_cansleep(pcm3168a->gpio_rst, 0);
+ /*
+ * The RST is low active, we want the GPIO line to be low when the
+ * driver is removed, so set level to 1 which in practice means
+ * ASSERTED:
+ * The asserted level of GPIO_ACTIVE_LOW is LOW.
+ */
+ gpiod_set_value_cansleep(pcm3168a->gpio_rst, 1);
pm_runtime_disable(dev);
#ifndef CONFIG_PM
pcm3168a_disable(dev);
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
