linux-kernel - Re: [PATCH 2/3] soc: mediatek: pm-domains: Add domain regulator supply

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Date:   Sun, 10 Jan 2021 09:49:16 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Mark Brown <broonie@...nel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 2/3] soc: mediatek: pm-domains: Add domain regulator supply

On Thu, Jan 7, 2021 at 6:49 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> Some power domains (eg. mfg) needs to turn on power supply before power
> on.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>

Reviewed-by: Nicolas Boichat <drinkcat@...omium.org>

> ---
>  drivers/soc/mediatek/mt8183-pm-domains.h |  1 +
>  drivers/soc/mediatek/mtk-pm-domains.c    | 36 +++++++++++++++++++++++-
>  drivers/soc/mediatek/mtk-pm-domains.h    |  1 +
>  3 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/mediatek/mt8183-pm-domains.h b/drivers/soc/mediatek/mt8183-pm-domains.h
> index 8d996c5d2682d..aa5230e6c12f8 100644
> --- a/drivers/soc/mediatek/mt8183-pm-domains.h
> +++ b/drivers/soc/mediatek/mt8183-pm-domains.h
> @@ -38,6 +38,7 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8183[] = {
>                 .ctl_offs = 0x0338,
>                 .sram_pdn_bits = GENMASK(8, 8),
>                 .sram_pdn_ack_bits = GENMASK(12, 12),
> +               .caps = MTK_SCPD_DOMAIN_SUPPLY,
>         },
>         [MT8183_POWER_DOMAIN_MFG_CORE0] = {
>                 .sta_mask = BIT(7),
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index fb70cb3b07b36..ae255aa7b1a97 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
[snip]
> @@ -275,6 +295,7 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>  {
>         const struct scpsys_domain_data *domain_data;
>         struct scpsys_domain *pd;
> +       struct device_node *np = scpsys->dev->of_node;
>         struct property *prop;
>         const char *clk_name;
>         int i, ret, num_clks;
> @@ -307,6 +328,19 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>         pd->data = domain_data;
>         pd->scpsys = scpsys;
>
> +       if (MTK_SCPD_CAPS(pd, MTK_SCPD_DOMAIN_SUPPLY)) {
> +               /* Find regulator in current power domain node */
> +               scpsys->dev->of_node = node;
> +               pd->supply = devm_regulator_get(scpsys->dev, "domain");
> +               scpsys->dev->of_node = np;

This pattern is a bit strange to me. But Hsin-Yi pointed out that
there are precedents:
https://elixir.bootlin.com/linux/v5.11-rc2/source/drivers/iio/adc/rcar-gyroadc.c#L397
.

> +               if (IS_ERR(pd->supply)) {
> +                       dev_err_probe(scpsys->dev, PTR_ERR(pd->supply),
> +                                     "%pOF: failed to get power supply.\n",
> +                                     node);
> +                       return ERR_CAST(pd->supply);
> +               }
> +       }
> +
>         pd->infracfg = syscon_regmap_lookup_by_phandle_optional(node, "mediatek,infracfg");
>         if (IS_ERR(pd->infracfg))
>                 return ERR_CAST(pd->infracfg);
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
> index a2f4d8f97e058..b2770b5266dba 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.h
> +++ b/drivers/soc/mediatek/mtk-pm-domains.h
> @@ -7,6 +7,7 @@
>  #define MTK_SCPD_FWAIT_SRAM            BIT(1)
>  #define MTK_SCPD_SRAM_ISO              BIT(2)
>  #define MTK_SCPD_KEEP_DEFAULT_OFF      BIT(3)
> +#define MTK_SCPD_DOMAIN_SUPPLY         BIT(4)
>  #define MTK_SCPD_CAPS(_scpd, _x)       ((_scpd)->data->caps & (_x))
>
>  #define SPM_VDE_PWR_CON                        0x0210
> --
> 2.29.2.729.g45daf8777d-goog
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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