linux-kernel - [PATCH 2/9] pwm: pxa: add optional reset control

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Message-ID: <20250411131423.3802611-3-guodong@riscstar.com>
Date: Fri, 11 Apr 2025 21:14:16 +0800
From: Guodong Xu <guodong@...cstar.com>
To: ukleinek@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	paul.walmsley@...ive.com,
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	hal.feng@...rfivetech.com,
	unicorn_wang@...look.com,
	duje.mihanovic@...le.hr
Cc: elder@...cstar.com,
	linux-pwm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	spacemit@...ts.linux.dev
Subject: [PATCH 2/9] 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>
---
 drivers/pwm/pwm-pxa.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 430bd6a709e9..dd9c6af0f672 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>
 
@@ -49,10 +50,10 @@ MODULE_DEVICE_TABLE(platform, pwm_id_table);
 #define PWMDCR_FD	(1 << 10)
 
 struct pxa_pwm_chip {
-	struct device	*dev;
-
-	struct clk	*clk;
-	void __iomem	*mmio_base;
+	struct device		*dev;
+	struct clk		*clk;
+	void __iomem		*mmio_base;
+	struct reset_control	*reset;
 };
 
 static inline struct pxa_pwm_chip *to_pxa_pwm_chip(struct pwm_chip *chip)
@@ -179,6 +180,11 @@ static int pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(pc->clk))
 		return PTR_ERR(pc->clk);
 
+	pc->reset = devm_reset_control_get_optional_exclusive_deasserted(
+			&pdev->dev, NULL);
+	if (IS_ERR(pc->reset))
+		return PTR_ERR(pc->reset);
+
 	chip->ops = &pxa_pwm_ops;
 
 	if (IS_ENABLED(CONFIG_OF))
-- 
2.43.0