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Subject: Re: [PATCH v21 3/5] i2c: mediatek: mt65xx: add optional vbus-supply
To:     Hsin-Yi Wang <hsinyi@chromium.org>, Wolfram Sang <wsa@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc:     linux-i2c@vger.kernel.org, Qii Wang <qii.wang@mediatek.com>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mark Brown <broonie@kernel.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Bibby Hsieh <bibby.hsieh@mediatek.com>,
        Arnd Bergmann <arnd@arndb.de>
References: <20210507131406.2224177-1-hsinyi@chromium.org>
 <20210507131406.2224177-4-hsinyi@chromium.org>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Message-ID: <6e971f16-a325-34cd-faaa-cfd51db86c66@gmail.com>
Date:   Wed, 12 May 2021 17:46:07 +0200
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On 07/05/2021 15:14, Hsin-Yi Wang wrote:
> Add vbus-supply which provides power to SCL/SDA. Pass this regulator
> into core so it can be turned on/off for low power mode support.
> 
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> ---
>  drivers/i2c/busses/i2c-mt65xx.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> index 5ddfa4e56ee2..22d1d14b5de5 100644
> --- a/drivers/i2c/busses/i2c-mt65xx.c
> +++ b/drivers/i2c/busses/i2c-mt65xx.c
> @@ -1220,6 +1220,13 @@ static int mtk_i2c_probe(struct platform_device *pdev)
>  	i2c->adap.quirks = i2c->dev_comp->quirks;
>  	i2c->adap.timeout = 2 * HZ;
>  	i2c->adap.retries = 1;
> +	i2c->adap.bus_regulator = devm_regulator_get_optional(&pdev->dev, "vbus");
> +	if (IS_ERR(i2c->adap.bus_regulator)) {
> +		if (PTR_ERR(i2c->adap.bus_regulator) == -ENODEV)
> +			i2c->adap.bus_regulator = NULL;
> +		else
> +			return PTR_ERR(i2c->adap.bus_regulator);
> +	}
>  
>  	ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c);
>  	if (ret)
>