Patch "cpufreq: mediatek-hw: Don't error out if supply is not found" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    cpufreq: mediatek-hw: Don't error out if supply is not found

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cpufreq-mediatek-hw-don-t-error-out-if-supply-is-not.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 1ded2a00690ccd0648458ba67e06b7bcce7e609d
Author: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
Date:   Wed Jan 24 17:31:43 2024 -0300

    cpufreq: mediatek-hw: Don't error out if supply is not found
    
    [ 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@xxxxxxxxxxxx>
    Closes: https://linux.kernelci.org/test/case/id/65b0b169710edea22852a3fa/
    Signed-off-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
    Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
    Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

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);