linux-kernel - [PATCH v2 2/5] mux: gpio: add optional regulator support

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Message-Id: <20250320115633.4248-3-srinivas.kandagatla@linaro.org>
Date: Thu, 20 Mar 2025 11:56:30 +0000
From: srinivas.kandagatla@...aro.org
To: peda@...ntia.se,
	broonie@...nel.org,
	andersson@...nel.org,
	krzk+dt@...nel.org
Cc: ivprusov@...utedevices.com,
	luca.ceresoli@...tlin.com,
	zhoubinbin@...ngson.cn,
	paulha@...nsource.cirrus.com,
	lgirdwood@...il.com,
	robh@...nel.org,
	conor+dt@...nel.org,
	konradybcio@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	dmitry.baryshkov@....qualcomm.com,
	linux-sound@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	johan+linaro@...nel.org,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v2 2/5] mux: gpio: add optional regulator support

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

Some of the external muxes needs powering up using a regulator.
This is the case with Lenovo T14s laptop which has a external audio mux
to handle US/EURO headsets.

Add support to the driver to handle this optional regulator.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/mux/gpio.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index cc5f2c1861d4..12cd9b5c32fb 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -15,6 +15,7 @@
 #include <linux/mux/driver.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/regulator/consumer.h>
 
 struct mux_gpio {
 	struct gpio_descs *gpios;
@@ -82,6 +83,13 @@ static int mux_gpio_probe(struct platform_device *pdev)
 		mux_chip->mux->idle_state = idle_state;
 	}
 
+	ret = devm_regulator_get_enable_optional(dev, "mux");
+	if (ret && ret != -ENODEV) {
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "Couldn't retrieve/enable gpio mux supply\n");
+		return ret;
+	}
+
 	ret = devm_mux_chip_register(dev, mux_chip);
 	if (ret < 0)
 		return ret;
-- 
2.39.5