[PATCH v4 2/4] gpio: rockchip: change the GPIO version judgment logic

[Ye Zhang]

Have a list of valid IDs and default to -ENODEV.

Signed-off-by: Ye Zhang <ye.zhang at rock-chips.com>
---
 drivers/gpio/gpio-rockchip.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 71672d654491..f05b92e0e977 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -667,8 +667,13 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 	clk_prepare_enable(bank->clk);
 	id = readl(bank->reg_base + gpio_regs_v2.version_id);
 
-	/* If not gpio v2, that is default to v1. */
-	if (id == GPIO_TYPE_V2 || id == GPIO_TYPE_V2_1) {
+	switch (id) {
+	case GPIO_TYPE_V1:
+		bank->gpio_regs = &gpio_regs_v1;
+		bank->gpio_type = GPIO_TYPE_V1;
+		break;
+	case GPIO_TYPE_V2:
+	case GPIO_TYPE_V2_1:
 		bank->gpio_regs = &gpio_regs_v2;
 		bank->gpio_type = GPIO_TYPE_V2;
 		bank->db_clk = of_clk_get(bank->of_node, 1);
@@ -677,9 +682,10 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 			clk_disable_unprepare(bank->clk);
 			return -EINVAL;
 		}
-	} else {
-		bank->gpio_regs = &gpio_regs_v1;
-		bank->gpio_type = GPIO_TYPE_V1;
+		break;
+	default:
+		dev_err(bank->dev, "cannot get the version ID\n");
+		return -ENODEV;
 	}
 
 	return 0;
-- 
2.34.1