linux-kernel - [PATCH v2] gpio: rockchip: Update debounce config function

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Message-Id: <20240823034314.62305-7-ye.zhang@rock-chips.com>
Date: Fri, 23 Aug 2024 11:43:09 +0800
From: Ye Zhang <ye.zhang@...k-chips.com>
To: linus.walleij@...aro.org,
	brgl@...ev.pl,
	heiko@...ech.de,
	linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	mika.westerberg@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	tao.huang@...k-chips.com,
	finley.xiao@...k-chips.com,
	tim.chen@...k-chips.com,
	elaine.zhang@...k-chips.com,
	Ye Zhang <ye.zhang@...k-chips.com>
Subject: [PATCH v2] gpio: rockchip: Update debounce config function

In the GPIO with version number 0x01000C2B, debounce configuration is
already supported.

Signed-off-by: Ye Zhang <ye.zhang@...k-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index c246f116a3b5..aff8bec79062 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -250,6 +250,8 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 			clk_prepare_enable(bank->db_clk);
 		else
 			clk_disable_unprepare(bank->db_clk);
+	} else {
+		return -ENOTSUPP;
 	}
 
 	return 0;
@@ -278,22 +280,11 @@ static int rockchip_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 				  unsigned long config)
 {
 	enum pin_config_param param = pinconf_to_config_param(config);
+	unsigned int debounce = pinconf_to_config_argument(config);
 
 	switch (param) {
 	case PIN_CONFIG_INPUT_DEBOUNCE:
-		rockchip_gpio_set_debounce(gc, offset, true);
-		/*
-		 * Rockchip's gpio could only support up to one period
-		 * of the debounce clock(pclk), which is far away from
-		 * satisftying the requirement, as pclk is usually near
-		 * 100MHz shared by all peripherals. So the fact is it
-		 * has crippled debounce capability could only be useful
-		 * to prevent any spurious glitches from waking up the system
-		 * if the gpio is conguired as wakeup interrupt source. Let's
-		 * still return -ENOTSUPP as before, to make sure the caller
-		 * of gpiod_set_debounce won't change its behaviour.
-		 */
-		return -ENOTSUPP;
+		return rockchip_gpio_set_debounce(gc, offset, debounce);
 	default:
 		return -ENOTSUPP;
 	}
-- 
2.34.1