linux-kernel - Re: [PATCH v21 3/5] i2c: mediatek: mt65xx: add optional vbus-supply

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Message-ID: <1621238813.24305.5.camel@mhfsdcap03>
Date:   Mon, 17 May 2021 16:06:53 +0800
From:   Qii Wang <qii.wang@...iatek.com>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
CC:     Wolfram Sang <wsa@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Bartosz Golaszewski" <bgolaszewski@...libre.com>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Bibby Hsieh" <bibby.hsieh@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v21 3/5] i2c: mediatek: mt65xx: add optional vbus-supply

On Fri, 2021-05-07 at 21:14 +0800, 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@...omium.org>

Reviewed-by: Qii Wang <qii.wang@...iatek.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)