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Wysocki" , Mark Brown , Matthias Brugger , AngeloGioacchino Del Regno , kernel@collabora.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, "kernelci.org bot" , =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4g?= =?utf-8?b?UHJhZG8=?= X-Mailer: b4 0.12.4 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789005394038291519 X-GMAIL-MSGID: 1789005394038291519 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 Closes: https://linux.kernelci.org/test/case/id/65b0b169710edea22852a3fa/ Signed-off-by: Nícolas F. R. A. Prado Reviewed-by: AngeloGioacchino Del Regno --- drivers/cpufreq/mediatek-cpufreq-hw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 9ac3ebaef3cc43ecd136911c44f1427286ee5a05 change-id: 20240124-mtk-cpufreq-hw-regulator-enodev-fix-f614019689d0 Best regards, diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c index a1aa9385980a..8d097dcddda4 100644 --- a/drivers/cpufreq/mediatek-cpufreq-hw.c +++ b/drivers/cpufreq/mediatek-cpufreq-hw.c @@ -312,7 +312,7 @@ 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);