linux-kernel - Re: [PATCH] soc: mediatek: Introduce mediatek-regulator-coupler driver

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Date:   Thu, 16 Jun 2022 15:49:03 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, matthias.bgg@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org,
        alyssa.rosenzweig@...labora.com, nfraprado@...labora.com
Subject: Re: [PATCH] soc: mediatek: Introduce mediatek-regulator-coupler
 driver

16.06.2022 12:45, AngeloGioacchino Del Regno пишет:
> +static int mediatek_regulator_attach(struct regulator_coupler *coupler,
> +				     struct regulator_dev *rdev)
> +{
> +	struct mediatek_regulator_coupler *mrc = to_mediatek_coupler(coupler);
> +	const char *rdev_name = rdev_get_name(rdev);
> +
> +	if (strstr(rdev_name, "sram")) {
> +		if (mrc->vsram_rdev)
> +			return -EINVAL;
> +		mrc->vsram_rdev = rdev;
> +	}

You should filter out regulators unrelated to SRAM and GPU, see
regulator_find_coupler().

> +	return 0;
> +}
> +
> +static int mediatek_regulator_detach(struct regulator_coupler *coupler,
> +				     struct regulator_dev *rdev)
> +{
> +	struct mediatek_regulator_coupler *mrc = to_mediatek_coupler(coupler);
> +
> +	if (rdev == mrc->vsram_rdev) {
> +		mrc->vsram_rdev = NULL;
> +		return 0;
> +	}

The regulator core should emit error message about GPU regulator failed
to detach because you're returning -EINVAL for it.

> +	return -EINVAL;
> +}