linux-kernel - [PATCH 1/4] gpio/rockchip: extended debounce support is only available on v2

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Date:   Tue, 14 Sep 2021 00:49:23 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com
Cc:     heiko@...ech.de, jay.xu@...k-chips.com, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] gpio/rockchip: extended debounce support is only available on v2

The gpio driver runs into issues on v1 gpio blocks, as the db_clk
and the whole extended debounce support is only ever defined on v2.
So checking for the IS_ERR on the db_clk is not enough, as it will
be NULL on v1.

Fix this by adding the needed condition for v2 first before checking
the existence of the db_clk.

This caused my rk3288-veyron-pinky to enter a reboot loop when it
tried to enable the power-key as adc-key device.

Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller")
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 drivers/gpio/gpio-rockchip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 036b2d959503..16d9bf7188e3 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -195,7 +195,7 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 	unsigned int cur_div_reg;
 	u64 div;
 
-	if (!IS_ERR(bank->db_clk)) {
+	if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
 		div_debounce_support = true;
 		freq = clk_get_rate(bank->db_clk);
 		max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
-- 
2.29.2