linux-kernel - [PATCH v2 1/3] ASoC: codec: wcd939x: Convert to GPIO descriptors

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Message-Id: <20250324-wcd-gpiod-v2-1-773f67ce3b56@nxp.com>
Date: Mon, 24 Mar 2025 19:51:27 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Steev Klimaszewski <steev@...i.org>, Johan Hovold <johan@...nel.org>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 Peng Fan <peng.fan@....com>
Subject: [PATCH v2 1/3] ASoC: codec: wcd939x: Convert to GPIO descriptors

From: Peng Fan <peng.fan@....com>

of_gpio.h is deprecated, update the driver to use GPIO descriptors.
 - Use dev_gpiod_get to get GPIO descriptor.
 - Use gpiod_set_value to configure output value.

With legacy of_gpio API, the driver set gpio value 0 to assert reset,
and 1 to deassert reset. And the reset-gpios use GPIO_ACTIVE_LOW flag in
DTS, so set GPIOD_OUT_LOW when get GPIO descriptors, and set value 1 means
output low, set value 0 means output high with gpiod API.

The in-tree DTS files have the right polarity set up already so we
can expect this to "just work".

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 sound/soc/codecs/wcd939x.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/wcd939x.c b/sound/soc/codecs/wcd939x.c
index 0a87a79772da6c0ed3c7dd7d098e949b9cead2a4..837c86ceb1097254f4029087ce401c5a8645bf21 100644
--- a/sound/soc/codecs/wcd939x.c
+++ b/sound/soc/codecs/wcd939x.c
@@ -15,7 +15,6 @@
 #include <linux/pm_runtime.h>
 #include <linux/component.h>
 #include <sound/tlv.h>
-#include <linux/of_gpio.h>
 #include <linux/of_graph.h>
 #include <linux/of.h>
 #include <sound/jack.h>
@@ -201,7 +200,7 @@ struct wcd939x_priv {
 	u32 hph_mode;
 	u32 tx_mode[TX_ADC_MAX];
 	int variant;
-	int reset_gpio;
+	struct gpio_desc *reset_gpio;
 	u32 micb1_mv;
 	u32 micb2_mv;
 	u32 micb3_mv;
@@ -3239,10 +3238,11 @@ static int wcd939x_populate_dt_data(struct wcd939x_priv *wcd939x, struct device
 #endif /* CONFIG_TYPEC */
 	int ret;
 
-	wcd939x->reset_gpio = of_get_named_gpio(dev->of_node, "reset-gpios", 0);
-	if (wcd939x->reset_gpio < 0)
-		return dev_err_probe(dev, wcd939x->reset_gpio,
-				     "Failed to get reset gpio\n");
+	wcd939x->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(wcd939x->reset_gpio)) {
+		ret = PTR_ERR(wcd939x->reset_gpio);
+		return dev_err_probe(dev, ret, "Failed to get reset gpio\n");
+	}
 
 	wcd939x->supplies[0].supply = "vdd-rxtx";
 	wcd939x->supplies[1].supply = "vdd-io";
@@ -3290,10 +3290,10 @@ static int wcd939x_populate_dt_data(struct wcd939x_priv *wcd939x, struct device
 
 static int wcd939x_reset(struct wcd939x_priv *wcd939x)
 {
-	gpio_direction_output(wcd939x->reset_gpio, 0);
+	gpiod_set_value(wcd939x->reset_gpio, 1);
 	/* 20us sleep required after pulling the reset gpio to LOW */
 	usleep_range(20, 30);
-	gpio_set_value(wcd939x->reset_gpio, 1);
+	gpiod_set_value(wcd939x->reset_gpio, 0);
 	/* 20us sleep required after pulling the reset gpio to HIGH */
 	usleep_range(20, 30);
 

-- 
2.37.1