linux-kernel - [PATCH 03/13] mfd: pm8008: deassert reset on probe

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Date: Mon,  6 May 2024 17:08:20 +0200
From: Johan Hovold <johan+linaro@...nel.org>
To: Lee Jones <lee@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Das Srinagesh <quic_gurus@...cinc.com>,
	Satya Priya <quic_c_skakit@...cinc.com>,
	Stephen Boyd <swboyd@...omium.org>,
	linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 03/13] mfd: pm8008: deassert reset on probe

Request and deassert any (optional) reset gpio during probe in case it
has been left asserted by the boot firmware.

Note the reset line is not asserted to avoid reverting to the default
I2C address in case the firmware has configured an alternate address.

Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/mfd/qcom-pm8008.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
index d53c987b0d49..d0f190c2ea2b 100644
--- a/drivers/mfd/qcom-pm8008.c
+++ b/drivers/mfd/qcom-pm8008.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
@@ -158,6 +159,7 @@ static struct regmap_config qcom_mfd_regmap_cfg = {
 static int pm8008_probe(struct i2c_client *client)
 {
 	struct regmap_irq_chip_data *irq_data;
+	struct gpio_desc *reset;
 	int rc;
 	struct device *dev;
 	struct regmap *regmap;
@@ -169,6 +171,10 @@ static int pm8008_probe(struct i2c_client *client)
 
 	i2c_set_clientdata(client, regmap);
 
+	reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(reset))
+		return PTR_ERR(reset);
+
 	if (of_property_read_bool(dev->of_node, "interrupt-controller")) {
 		rc = devm_regmap_add_irq_chip(dev, regmap, client->irq,
 				IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
-- 
2.43.2