linux-kernel - [PATCH v2] pinctrl: stm32: Add check for clk

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Message-Id: <20241206210800.3346579-1-zmw12306@gmail.com>
Date: Fri,  6 Dec 2024 16:08:00 -0500
From: Mingwei Zheng <zmw12306@...il.com>
To: marex@...x.de
Cc: linus.walleij@...aro.org,
	mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com,
	make24@...as.ac.cn,
	peng.fan@....com,
	fabien.dessenne@...s.st.com,
	linux-gpio@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Mingwei Zheng <zmw12306@...il.com>,
	Jiasheng Jiang <jiashengjiangcool@...il.com>
Subject: [PATCH v2] pinctrl: stm32: Add check for clk_enable()

Convert the driver to clk_bulk*() API.
Add check for the return value of clk_bulk_enable() to catch
the potential error.

Fixes: 05d8af449d93 ("pinctrl: stm32: Keep pinctrl block clock enabled when LEVEL IRQ requested")
Signed-off-by: Mingwei Zheng <zmw12306@...il.com>
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@...il.com>
---
Changelog:

v1 -> v2:

1. Convert the driver to clk_bulk*() API.
---
 drivers/pinctrl/stm32/pinctrl-stm32.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index 5b7fa77c1184..188de29ac281 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -86,7 +86,6 @@ struct stm32_pinctrl_group {
 
 struct stm32_gpio_bank {
 	void __iomem *base;
-	struct clk *clk;
 	struct reset_control *rstc;
 	spinlock_t lock;
 	struct gpio_chip gpio_chip;
@@ -108,6 +107,7 @@ struct stm32_pinctrl {
 	unsigned ngroups;
 	const char **grp_names;
 	struct stm32_gpio_bank *banks;
+	struct clk_bulk_data *clks;
 	unsigned nbanks;
 	const struct stm32_pinctrl_match_data *match_data;
 	struct irq_domain	*domain;
@@ -1308,7 +1308,7 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
 	if (IS_ERR(bank->base))
 		return PTR_ERR(bank->base);
 
-	err = clk_prepare_enable(bank->clk);
+	err = clk_prepare_enable(pctl->clks[pctl->nbanks].clk);
 	if (err) {
 		dev_err(dev, "failed to prepare_enable clk (%d)\n", err);
 		return err;
@@ -1397,7 +1397,7 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
 	return 0;
 
 err_clk:
-	clk_disable_unprepare(bank->clk);
+	clk_disable_unprepare(pctl->clks[pctl->nbanks].clk);
 	return err;
 }
 
@@ -1631,11 +1631,10 @@ int stm32_pctl_probe(struct platform_device *pdev)
 			fwnode_handle_put(child);
 			return -EPROBE_DEFER;
 		}
-
-		bank->clk = of_clk_get_by_name(np, NULL);
-		if (IS_ERR(bank->clk)) {
+		pctl->clks[i].clk = of_clk_get_by_name(np, NULL);
+		if (IS_ERR(pctl->clks[i].clk)) {
 			fwnode_handle_put(child);
-			return dev_err_probe(dev, PTR_ERR(bank->clk),
+			return dev_err_probe(dev, PTR_ERR(pctl->clks[i].clk),
 					     "failed to get clk\n");
 		}
 		i++;
@@ -1647,7 +1646,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
 			fwnode_handle_put(child);
 
 			for (i = 0; i < pctl->nbanks; i++)
-				clk_disable_unprepare(pctl->banks[i].clk);
+				clk_disable_unprepare(pctl->clks[i].clk);
 
 			return ret;
 		}
@@ -1726,10 +1725,8 @@ static int __maybe_unused stm32_pinctrl_restore_gpio_regs(
 int __maybe_unused stm32_pinctrl_suspend(struct device *dev)
 {
 	struct stm32_pinctrl *pctl = dev_get_drvdata(dev);
-	int i;
 
-	for (i = 0; i < pctl->nbanks; i++)
-		clk_disable(pctl->banks[i].clk);
+	clk_bulk_disable(pctl->nbanks, pctl->clks);
 
 	return 0;
 }
@@ -1738,10 +1735,11 @@ int __maybe_unused stm32_pinctrl_resume(struct device *dev)
 {
 	struct stm32_pinctrl *pctl = dev_get_drvdata(dev);
 	struct stm32_pinctrl_group *g = pctl->groups;
-	int i;
+	int i, ret;
 
-	for (i = 0; i < pctl->nbanks; i++)
-		clk_enable(pctl->banks[i].clk);
+	ret = clk_bulk_enable(pctl->nbanks, pctl->clks);
+	if (ret)
+		return ret;
 
 	for (i = 0; i < pctl->ngroups; i++, g++)
 		stm32_pinctrl_restore_gpio_regs(pctl, g->pin);
-- 
2.34.1