linux-kernel - Re: [PATCH v7 04/11] mfd: mt6360: Combine mt6360 pmic/ldo resources into mt6360 regulator resources

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Date:   Fri, 15 Jan 2021 11:55:00 +0800
From:   Gene Chen <gene.chen.richtek@...il.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     sre@...nel.org, Rob Herring <robh+dt@...nel.org>,
        linux-pm@...r.kernel.org, devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gene Chen <gene_chen@...htek.com>, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, ChiYuan Huang <cy_huang@...htek.com>,
        benjamin.chao@...iatek.com
Subject: Re: [PATCH v7 04/11] mfd: mt6360: Combine mt6360 pmic/ldo resources
 into mt6360 regulator resources

Matthias Brugger <matthias.bgg@...il.com> 於 2021年1月12日 週二 下午8:32寫道：
>
>
>
> On 12/11/2020 11:39, Gene Chen wrote:
> > From: Gene Chen <gene_chen@...htek.com>
> >
> > Combine mt6360 pmic/ldo resources into mt6360 regulator resources
> > to simplify the similar resources object.
> >
> > Signed-off-by: Gene Chen <gene_chen@...htek.com>
> > Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/mfd/mt6360-core.c | 11 +++--------
> >  1 file changed, 3 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c
> > index 692e47b..5119e51 100644
> > --- a/drivers/mfd/mt6360-core.c
> > +++ b/drivers/mfd/mt6360-core.c
> > @@ -265,7 +265,7 @@ static const struct resource mt6360_led_resources[] = {
> >       DEFINE_RES_IRQ_NAMED(MT6360_FLED1_STRB_TO_EVT, "fled1_strb_to_evt"),
> >  };
> >
> > -static const struct resource mt6360_pmic_resources[] = {
> > +static const struct resource mt6360_regulator_resources[] = {
> >       DEFINE_RES_IRQ_NAMED(MT6360_BUCK1_PGB_EVT, "buck1_pgb_evt"),
> >       DEFINE_RES_IRQ_NAMED(MT6360_BUCK1_OC_EVT, "buck1_oc_evt"),
> >       DEFINE_RES_IRQ_NAMED(MT6360_BUCK1_OV_EVT, "buck1_ov_evt"),
> > @@ -278,9 +278,6 @@ static const struct resource mt6360_pmic_resources[] = {
> >       DEFINE_RES_IRQ_NAMED(MT6360_LDO7_OC_EVT, "ldo7_oc_evt"),
> >       DEFINE_RES_IRQ_NAMED(MT6360_LDO6_PGB_EVT, "ldo6_pgb_evt"),
> >       DEFINE_RES_IRQ_NAMED(MT6360_LDO7_PGB_EVT, "ldo7_pgb_evt"),
> > -};
> > -
> > -static const struct resource mt6360_ldo_resources[] = {
> >       DEFINE_RES_IRQ_NAMED(MT6360_LDO1_OC_EVT, "ldo1_oc_evt"),
> >       DEFINE_RES_IRQ_NAMED(MT6360_LDO2_OC_EVT, "ldo2_oc_evt"),
> >       DEFINE_RES_IRQ_NAMED(MT6360_LDO3_OC_EVT, "ldo3_oc_evt"),
> > @@ -298,10 +295,8 @@ static const struct mfd_cell mt6360_devs[] = {
> >                   NULL, 0, 0, "mediatek,mt6360-chg"),
> >       OF_MFD_CELL("mt6360-led", mt6360_led_resources,
> >                   NULL, 0, 0, "mediatek,mt6360-led"),
> > -     OF_MFD_CELL("mt6360-pmic", mt6360_pmic_resources,
> > -                 NULL, 0, 0, "mediatek,mt6360-pmic"),
> > -     OF_MFD_CELL("mt6360-ldo", mt6360_ldo_resources,
> > -                 NULL, 0, 0, "mediatek,mt6360-ldo"),
> > +     OF_MFD_CELL("mt6360-regulator", mt6360_regulator_resources,
> > +                 NULL, 0, 0, "mediatek,mt6360-regulator"),
>
> As discussed with the MFD maintainer [1], the regulator (and probably all cells)
> shouldn't have a DT binding.
>
> So please send a new version which fixes that.
>
> Regards,
> Matthias
>
> [1] https://lore.kernel.org/linux-mediatek/20210111164118.GE4728@sirena.org.uk/
>

Should I use parent's device to find sub-devices of_node if without
compatible name?
I trace the function mfd_add_device,

if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
    .....
    ret = mfd_match_of_node_to_dev(pdev, np, cell);
    .....
}

which is binding mfd sub-device with compatible. Does it be removed in
the feature?

> >       OF_MFD_CELL("mt6360-tcpc", NULL,
> >                   NULL, 0, 0, "mediatek,mt6360-tcpc"),
> >  };
> >