[PATCH v1] gpio: mvebu: Fix optional clock enable handling

[Yuho Choi <dbgh9129@gmail.com>]

mvebu_gpio_probe() ignores clk_prepare_enable() failures and has no
matching disable path for later probe failures.

Use devm_clk_get_optional_enabled() so clock lookup and enable failures
are reported, and so devres disables the clock on cleanup. Reject PWM
setup when the optional clock is absent.

Fixes: de88747f514a ("gpio: mvebu: Add clk support to prevent lockup")
Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
---
 drivers/gpio/gpio-mvebu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index c030d1f00abc..c63cdaa78ac1 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -1152,10 +1152,10 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
 		return id;
 	}
 
-	mvchip->clk = devm_clk_get(&pdev->dev, NULL);
+	mvchip->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);
 	/* Not all SoCs require a clock.*/
-	if (!IS_ERR(mvchip->clk))
-		clk_prepare_enable(mvchip->clk);
+	if (IS_ERR(mvchip->clk))
+		return PTR_ERR(mvchip->clk);
 
 	mvchip->soc_variant = soc_variant;
 	mvchip->chip.label = dev_name(&pdev->dev);
-- 
2.43.0