[PATCH 1/3] gpio: rockchip: make gpio work without cru module

[Jianqun Xu]

In some case the system may has no builtin cru module, the gpio driver
will fail to get periph clock and debounce clock.

On rockchip SoCs, the pclk and dbg clk are default to be enabled and
ungated, the gpio possible to work without cru module.

This patch makes gpio work fine without cru module.

Signed-off-by: Jianqun Xu <jay.xu at rock-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index a4c4e4584f5b..1da0324445cc 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -195,6 +195,9 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
 	unsigned int cur_div_reg;
 	u64 div;
 
+	if (!bank->db_clk)
+		return -ENOENT;
+
 	if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
 		div_debounce_support = true;
 		freq = clk_get_rate(bank->db_clk);
@@ -654,8 +657,10 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 		return -EINVAL;
 
 	bank->clk = of_clk_get(bank->of_node, 0);
-	if (IS_ERR(bank->clk))
-		return PTR_ERR(bank->clk);
+	if (IS_ERR(bank->clk)) {
+		bank->clk = NULL;
+		dev_warn(bank->dev, "works without clk pm\n");
+	}
 
 	clk_prepare_enable(bank->clk);
 	id = readl(bank->reg_base + gpio_regs_v2.version_id);
@@ -666,9 +671,8 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 		bank->gpio_type = GPIO_TYPE_V2;
 		bank->db_clk = of_clk_get(bank->of_node, 1);
 		if (IS_ERR(bank->db_clk)) {
-			dev_err(bank->dev, "cannot find debounce clk\n");
-			clk_disable_unprepare(bank->clk);
-			return -EINVAL;
+			bank->db_clk = NULL;
+			dev_warn(bank->dev, "works without debounce clk pm\n");
 		}
 	} else {
 		bank->gpio_regs = &gpio_regs_v1;
-- 
2.25.1