linux-kernel - Re: [PATCH v2 4/7] thermal: exynos: simplify regulator (de)initialization

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Date:   Fri, 29 Sep 2023 12:46:27 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     m.majewski2@...sung.com,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v2 4/7] thermal: exynos: simplify regulator
 (de)initialization

On 26/09/2023 13:02, Mateusz Majewski wrote:
> Hi,
> 
>> This is not equivalent. If regulator is provided and enable fails, the
>> old code is nicely returning error. Now, it will print misleading
>> message - failed to get regulator - and continue.
>>
>> While this simplifies the code, it ignores important running condition -
>> having regulator enabled.
> 
> Would doing this be correct?
> 
> ret = devm_regulator_get_enable_optional(&pdev->dev, "vtmu");
> switch (ret) {
> case 0:
> case -ENODEV:

Not sure to understand why -NODEV is not an error

> 	break;
> case -EPROBE_DEFER:
> 	return -EPROBE_DEFER;
> default:
> 	dev_err(&pdev->dev, "Failed to get enabled regulator: %d\n",
> 		ret);
> 	return ret;
> }

ret = devm_regulator_get_enable_optional(&pdev->dev, "vtmu");
if (ret < 0) {
	if (ret != EPROBE_DEFER)
		dev_err(&pdev->dev, "Failed to get enabled regulator: %d\n", ret);
	return ret;
}

??

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