linux-kernel - [PATCH v3 2/6] pwm: pxa: add optional reset control

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Message-ID: <20250429085048.1310409-3-guodong@riscstar.com>
Date: Tue, 29 Apr 2025 16:50:44 +0800
From: Guodong Xu <guodong@...cstar.com>
To: ukleinek@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
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Cc: elder@...cstar.com,
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Subject: [PATCH v3 2/6] pwm: pxa: add optional reset control

Support optional reset control for the PWM PXA driver.

During the probe, it acquires the reset controller using
devm_reset_control_get_optional_exclusive_deasserted() to get and deassert
the reset controller to enable the PWM channel.

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
v3: Dropped the addition of a reset_control field to the struct pxa_pwm_chip
    Using a local variable for reset in pwm_probe() instead
v2: No change

 drivers/pwm/pwm-pxa.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 430bd6a709e9..f6a862531601 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -25,6 +25,7 @@
 #include <linux/io.h>
 #include <linux/pwm.h>
 #include <linux/of.h>
+#include <linux/reset.h>
 
 #include <asm/div64.h>
 
@@ -160,6 +161,7 @@ static int pwm_probe(struct platform_device *pdev)
 	const struct platform_device_id *id = platform_get_device_id(pdev);
 	struct pwm_chip *chip;
 	struct pxa_pwm_chip *pc;
+	struct reset_control *rst;
 	int ret = 0;
 
 	if (IS_ENABLED(CONFIG_OF) && id == NULL)
@@ -179,6 +181,11 @@ static int pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(pc->clk))
 		return PTR_ERR(pc->clk);
 
+	rst = devm_reset_control_get_optional_exclusive_deasserted(&pdev->dev,
+								   NULL);
+	if (IS_ERR(rst))
+		return PTR_ERR(rst);
+
 	chip->ops = &pxa_pwm_ops;
 
 	if (IS_ENABLED(CONFIG_OF))
-- 
2.43.0