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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.

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Martin Blumenstingl 2019-06-12 21:58:59 +02:00 committed by Thierry Reding
parent 084f137600
commit ba4004c715
1 changed files with 3 additions and 8 deletions
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11
drivers/pwm/pwm-meson.c
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@ -483,14 +483,9 @@ 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;