[PATCH 5.15 070/317] cpufreq: mediatek-hw: Don't error out if supply is not found

Sasha Levin
2024-03-24T23:36:11Z

From: Nícolas F. R. A. Prado <nfraprado@collabora.com>

[ Upstream commit eaffb10b51bf74415c9252fd8fb4dd77122501ee ]

devm_regulator_get_optional() returns -ENODEV if no supply can be found.
By introducing its usage, commit 788715b5f21c ("cpufreq: mediatek-hw:
Wait for CPU supplies before probing") caused the driver to fail probe
if no supply was present in any of the CPU DT nodes.

Use devm_regulator_get() instead since the CPUs do require supplies
even if not described in the DT. It will gracefully return a dummy
regulator if none is found in the DT node, allowing probe to succeed.

Fixes: 788715b5f21c ("cpufreq: mediatek-hw: Wait for CPU supplies before probing")
Reported-by: kernelci.org bot <bot@kernelci.org>
Closes: https://linux.kernelci.org/test/case/id/65b0b169710edea22852a3fa/
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/cpufreq/mediatek-cpufreq-hw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
index 4a7478a91fb61..314c1cb6e8f4d 100644
--- a/drivers/cpufreq/mediatek-cpufreq-hw.c
+++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
@@ -280,7 +280,7 @@ static int mtk_cpufreq_hw_driver_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
"Failed to get cpu%d device\n", cpu);

- cpu_reg = devm_regulator_get_optional(cpu_dev, "cpu");
+ cpu_reg = devm_regulator_get(cpu_dev, "cpu");
if (IS_ERR(cpu_reg))
return dev_err_probe(&pdev->dev, PTR_ERR(cpu_reg),
"CPU%d regulator get failed\n", cpu);
--
2.43.0