linux-kernel - [PATCH v5 2/4] gpio: rockchip: change the GPIO version judgment logic

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Message-Id: <20241112015408.3139996-3-ye.zhang@rock-chips.com>
Date: Tue, 12 Nov 2024 09:54:06 +0800
From: Ye Zhang <ye.zhang@...k-chips.com>
To: Ye Zhang <ye.zhang@...k-chips.com>,
	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,
	Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: [PATCH v5 2/4] gpio: rockchip: change the GPIO version judgment logic

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

Signed-off-by: Ye Zhang <ye.zhang@...k-chips.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
 drivers/gpio/gpio-rockchip.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 702e711f9c23..49eaefeed8fa 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -667,8 +667,9 @@ 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_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 +678,14 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 			clk_disable_unprepare(bank->clk);
 			return -EINVAL;
 		}
-	} else {
+		break;
+	case GPIO_TYPE_V1:
 		bank->gpio_regs = &gpio_regs_v1;
 		bank->gpio_type = GPIO_TYPE_V1;
+		break;
+	default:
+		dev_err(bank->dev, "unsupported version ID: 0x%08x\n", id);
+		return -ENODEV;
 	}
 
 	return 0;
-- 
2.34.1