linux-kernel - [PATCH v2 02/14] pwm: meson: use devm_clk_get

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Message-Id: <20190608180626.30589-3-martin.blumenstingl@googlemail.com>
Date:   Sat,  8 Jun 2019 20:06:14 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-amlogic@...ts.infradead.org, linux-pwm@...r.kernel.org,
        thierry.reding@...il.com
Cc:     u.kleine-koenig@...gutronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH v2 02/14] pwm: meson: use devm_clk_get_optional() to get the input clock

Simplify the code which fetches the input clock for a PWM channel by
using devm_clk_get_optional().
This comes with a small functional change: previously all errors except
EPROBE_DEFER were ignored. Now all other errors are also treated as
errors. If no input clock is present devm_clk_get_optional() will return
NULL instead of an error which matches the behavior of the old code.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/pwm/pwm-meson.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 3fbbc4128ce8..35b38c7201c3 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -474,14 +474,9 @@ static int meson_pwm_init_channels(struct meson_pwm *meson,
 
 		snprintf(name, sizeof(name), "clkin%u", i);
 
-		channel->clk_parent = devm_clk_get(dev, name);
-		if (IS_ERR(channel->clk_parent)) {
-			err = PTR_ERR(channel->clk_parent);
-			if (err == -EPROBE_DEFER)
-				return err;
-
-			channel->clk_parent = NULL;
-		}
+		channel->clk_parent = devm_clk_get_optional(dev, name);
+		if (IS_ERR(channel->clk_parent))
+			return PTR_ERR(channel->clk_parent);
 	}
 
 	return 0;
-- 
2.21.0