[v2] gpio: rockchip: support 'clock-names' from dt nodes

Commit Message

Ye Zhang Aug. 23, 2024, 3:43 a.m. UTC

Added support for retrieving clocks using 'clock-names' from dt nodes

Signed-off-by: Ye Zhang <[e-mail]>
---
 drivers/gpio/gpio-rockchip.c | 42 ++++++++++++++++++++++++------------
 1 file changed, 28 insertions(+), 14 deletions(-)

Comments

Andy Shevchenko Aug. 23, 2024, 2:56 p.m. UTC | #1

On Fri, Aug 23, 2024 at 11:43:10AM +0800, Ye Zhang wrote:
> Added support for retrieving clocks using 'clock-names' from dt nodes

...

> +	bank->clk = devm_clk_get(dev, "bus");
> +	if (IS_ERR(bank->clk)) {
> +		bank->clk = of_clk_get(dev->of_node, 0);
> +		if (IS_ERR(bank->clk)) {

> +			dev_err(dev, "fail to get apb clock\n");
> +			return PTR_ERR(bank->clk);

			return dev_err_probe(...);

> +		}
> +	}

...

> +	clk_prepare_enable(bank->clk);
> +	clk_prepare_enable(bank->db_clk);

Any of this may fail. You perhaps want

	bank->...clk = devm_clk_get_enabled(dev, "...");

Not sure for the fallback case (of_clk_get() should be killed as we almost done
in GPIO library for GPIO APIs).

...

> +err_unlock:
> +	mutex_unlock(&bank->deferred_lock);

Don't you want to use guard()/scoped_guard() at some point?

Patch

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index aff8bec79062..25ddf6a82c09 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -646,23 +646,12 @@  static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
 	if (!bank->irq)
 		return -EINVAL;
 
-	bank->clk = of_clk_get(bank->of_node, 0);
-	if (IS_ERR(bank->clk))
-		return PTR_ERR(bank->clk);
-
-	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) {
 		bank->gpio_regs = &gpio_regs_v2;
 		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;
-		}
 	} else {
 		bank->gpio_regs = &gpio_regs_v1;
 		bank->gpio_type = GPIO_TYPE_V1;
@@ -722,10 +711,29 @@  static int rockchip_gpio_probe(struct platform_device *pdev)
 
 	raw_spin_lock_init(&bank->slock);
 
+	bank->clk = devm_clk_get(dev, "bus");
+	if (IS_ERR(bank->clk)) {
+		bank->clk = of_clk_get(dev->of_node, 0);
+		if (IS_ERR(bank->clk)) {
+			dev_err(dev, "fail to get apb clock\n");
+			return PTR_ERR(bank->clk);
+		}
+	}
+
 	ret = rockchip_get_bank_data(bank);
 	if (ret)
 		return ret;
 
+	bank->db_clk = devm_clk_get(dev, "db");
+	if (IS_ERR(bank->db_clk)) {
+		bank->db_clk = of_clk_get(dev->of_node, 1);
+		if (IS_ERR(bank->db_clk))
+			bank->db_clk = NULL;
+	}
+
+	clk_prepare_enable(bank->clk);
+	clk_prepare_enable(bank->db_clk);
+
 	/*
 	 * Prevent clashes with a deferred output setting
 	 * being added right at this moment.
@@ -734,9 +742,8 @@  static int rockchip_gpio_probe(struct platform_device *pdev)
 
 	ret = rockchip_gpiolib_register(bank);
 	if (ret) {
-		clk_disable_unprepare(bank->clk);
-		mutex_unlock(&bank->deferred_lock);
-		return ret;
+		dev_err(bank->dev, "Failed to register gpio %d\n", ret);
+		goto err_unlock;
 	}
 
 	while (!list_empty(&bank->deferred_pins)) {
@@ -769,6 +776,12 @@  static int rockchip_gpio_probe(struct platform_device *pdev)
 	dev_info(dev, "probed %pOF\n", np);
 
 	return 0;
+err_unlock:
+	mutex_unlock(&bank->deferred_lock);
+	clk_disable_unprepare(bank->clk);
+	clk_disable_unprepare(bank->db_clk);
+
+	return ret;
 }
 
 static void rockchip_gpio_remove(struct platform_device *pdev)
@@ -776,6 +789,7 @@  static void rockchip_gpio_remove(struct platform_device *pdev)
 	struct rockchip_pin_bank *bank = platform_get_drvdata(pdev);
 
 	clk_disable_unprepare(bank->clk);
+	clk_disable_unprepare(bank->db_clk);
 	gpiochip_remove(&bank->gpio_chip);
 }