linux-kernel - RE: [PATCH v2 1/3] regulator: mt6360: Add OF match table

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Message-ID: <b358179732f940f883c12dd1276f855a@richtek.com>
Date:   Mon, 11 Jan 2021 02:18:37 +0000
From:   gene_chen(陳俊宇) <gene_chen@...htek.com>
To:     "matthias.bgg@...nel.org" <matthias.bgg@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
CC:     Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>,
        Axel Lin <axel.lin@...ics.com>,
        Chen Zhong <chen.zhong@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Matthias Brugger <mbrugger@...e.com>
Subject: RE: [PATCH v2 1/3] regulator: mt6360: Add OF match table

[ Internal Use - External ]

Hi Matthias,

I discussed OF match table with Mark in previous mail in our PATCH v3,
MFD should just instantiate the platform device.

> Mark Brown <broonie@...nel.org> 於 2020年8月20日 週四 下午7:45寫道：

> > This device only exists in the context of a single parent device, there
> > should be no need for a compatible string here - this is just a detail
> > of how Linux does things.  The MFD should just instntiate the platform
> > device.

> Trying to autoload module without of_id_table will cause run-time error:
> ueventd: LoadWithAliases was unable to load
> of:NregulatorT(null)Cmediatek,mt6360-regulator

You shouldn't have this described in the device tree at all, like I say
the MFD should just instantiate the platform device.

> -----Original Message-----
> From: matthias.bgg@...nel.org <matthias.bgg@...nel.org>
> Sent: Saturday, January 9, 2021 7:26 PM
> To: Liam Girdwood <lgirdwood@...il.com>; Mark Brown
> <broonie@...nel.org>
> Cc: Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>; Axel Lin
> <axel.lin@...ics.com>; Chen Zhong <chen.zhong@...iatek.com>;
> gene_chen(陳俊宇) <gene_chen@...htek.com>; linux-kernel@...r.kernel.org;
> linux-mediatek@...ts.infradead.org; linux-arm-kernel@...ts.infradead.org;
> Matthias Brugger <matthias.bgg@...il.com>; Matti Vaittinen
> <matti.vaittinen@...rohmeurope.com>; Matthias Brugger
> <mbrugger@...e.com>
> Subject: [PATCH v2 1/3] regulator: mt6360: Add OF match table
>
> From: Matthias Brugger <mbrugger@...e.com>
>
> Binding documentation mentions that a compatible is required for the
> MT6360 device node, but the driver doesn't provide a OF match table.
>
> Fixes: d321571d5e4c ("regulator: mt6360: Add support for MT6360 regulator")
> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>
> ---
>
> Changes in v2:
> - check for CONFIG_OF
> - add Fixes tag
>
>  drivers/regulator/mt6360-regulator.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/regulator/mt6360-regulator.c
> b/drivers/regulator/mt6360-regulator.c
> index 15308ee29c13..f7b2514feabf 100644
> --- a/drivers/regulator/mt6360-regulator.c
> +++ b/drivers/regulator/mt6360-regulator.c
> @@ -445,9 +445,18 @@ static const struct platform_device_id
> mt6360_regulator_id_table[] = {  };  MODULE_DEVICE_TABLE(platform,
> mt6360_regulator_id_table);
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id mt6360_of_match[] = {
> +{ .compatible = "mediatek,mt6360-regulator", },
> +{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, mt6360_of_match); #endif
> +
>  static struct platform_driver mt6360_regulator_driver = {
>  .driver = {
>  .name = "mt6360-regulator",
> +.of_match_table = of_match_ptr(mt6360_of_match),
>  },
>  .probe = mt6360_regulator_probe,
>  .id_table = mt6360_regulator_id_table,
> --
> 2.29.2
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