linux-kernel - [PATCH 1/1] regulator: pwm: suppress EPROBE

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Date:   Mon, 21 Jan 2019 19:37:23 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     lgirdwood@...il.com, broonie@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        boris.brezillon@...e-electrons.com, thierry.reding@...il.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 1/1] regulator: pwm: suppress EPROBE_DEFER error message

Suppress the "Failed to get PWM" error output if the actual error code
is EPROBE_DEFER. This makes the behavior of the pwm-regulator driver
consistent with what most other drivers do (which is: print all errors
except EPROBE_DEFER).

An example where this cleans up the kernel log are the 32-bit Amlogic
Meson boards:
multi_v7_defconfig has CONFIG_REGULATOR_PWM=y and CONFIG_PWM_MESON=m.
When booting such a board (for example the Meson8b Odroid-C1) the
following message is printed five times during boot:
  pwm-regulator regulator-vcck: Failed to get PWM: -517
On the sixth call the pwm-meson driver is finally loaded (as rootfs
becomes ready) and the "VCCK" pwm-regulator comes up fine.

Fixes: aa66cc6630a408 ("regulator: pwm-regulator: get voltage and duty table from dts")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/regulator/pwm-regulator.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index 3f53f9134b32..7789d181ae67 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -357,7 +357,9 @@ static int pwm_regulator_probe(struct platform_device *pdev)
 	drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
 	if (IS_ERR(drvdata->pwm)) {
 		ret = PTR_ERR(drvdata->pwm);
-		dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
+
 		return ret;
 	}

-- 
2.20.1