From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: linux-amlogic@lists.infradead.org, linux-pwm@vger.kernel.org,
thierry.reding@gmail.com
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
u.kleine-koenig@pengutronix.de, narmstrong@baylibre.com,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH v3 02/14] pwm: meson: use devm_clk_get_optional() to get the input clock
Date: Wed, 12 Jun 2019 21:58:59 +0200 [thread overview]
Message-ID: <20190612195911.4442-3-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20190612195911.4442-1-martin.blumenstingl@googlemail.com>
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>
---
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;
--
2.22.0
next prev parent reply other threads:[~2019-06-12 20:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 19:58 [PATCH v3 00/14] pwm-meson: cleanups and improvements Martin Blumenstingl
2019-06-12 19:58 ` [PATCH v3 01/14] pwm: meson: unify the parameter list of meson_pwm_{enable,disable} Martin Blumenstingl
2019-06-12 19:58 ` Martin Blumenstingl [this message]
2019-06-12 19:59 ` [PATCH v3 03/14] pwm: meson: use GENMASK and FIELD_PREP for the lo and hi values Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 04/14] pwm: meson: change MISC_CLK_SEL_WIDTH to MISC_CLK_SEL_MASK Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 05/14] pwm: meson: don't duplicate the polarity internally Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 06/14] pwm: meson: pass struct pwm_device to meson_pwm_calc() Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 07/14] pwm: meson: add the meson_pwm_channel data to struct meson_pwm Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 08/14] pwm: meson: add the per-channel register offsets and bits in a struct Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 09/14] pwm: meson: move pwm_set_chip_data() to meson_pwm_request() Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 10/14] pwm: meson: simplify the calculation of the pre-divider and count Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 11/14] pwm: meson: read the full hardware state in meson_pwm_get_state() Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 12/14] pwm: meson: don't cache struct pwm_state internally Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 13/14] pwm: meson: add support PWM_POLARITY_INVERSED when disabling Martin Blumenstingl
2019-06-12 19:59 ` [PATCH v3 14/14] pwm: meson: add documentation to the driver Martin Blumenstingl
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