linux-kernel - Re: [PATCH v9 3/9] soc: mediatek: Add basic_clk_id to scp_power

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Date:   Tue, 17 Dec 2019 10:50:44 +0800
From:   Weiyi Lu <weiyi.lu@...iatek.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh@...nel.org>,
        James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>
Subject: Re: [PATCH v9 3/9] soc: mediatek: Add basic_clk_id to scp_power_data

On Mon, 2019-12-16 at 15:01 +0800, Nicolas Boichat wrote:
> On Tue, Dec 10, 2019 at 2:47 PM Weiyi Lu <weiyi.lu@...iatek.com> wrote:
> >
> > Try to stop extending the clk_id or clk_names if there are
> > more and more new BASIC clocks. To get its own clocks by the
> > basic_clk_id of each power domain.
> 
> Looking at this a bit more, I'm not sure why we make this an option...
> 
> The easiest way to make this consistent with non-MT8183 scpsys drivers
> is to add your missing clocks to "enum clk_id" and clk_names, but I
> understand it's not desired (number of clocks would blow up).
> 
> Can we, instead, convert all existing scpsys drivers to use "char *"
> clock names instead?
> I made an attempt here and it seems simple enough:
> https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1969103
> 

That's what we'd like to do in the future. But you're right! I should
complete it at one go.

> >
> > Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-scpsys.c | 29 +++++++++++++++++++++--------
> >  1 file changed, 21 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> > index f669d37..915d635 100644
> > --- a/drivers/soc/mediatek/mtk-scpsys.c
> > +++ b/drivers/soc/mediatek/mtk-scpsys.c
> > @@ -117,6 +117,8 @@ enum clk_id {
> >   * @sram_pdn_ack_bits: The mask for sram power control acked bits.
> >   * @bus_prot_mask: The mask for single step bus protection.
> >   * @clk_id: The basic clocks required by this power domain.
> > + * @basic_clk_id: provide the same purpose with field "clk_id"
> > + *                by declaring basic clock prefix name rather than clk_id.
> 
> Actually, I prefer the name clk_name, not sure why I pushed you in
> that direction...
> 

OK, I'll fix it in next version. But I'd like to use "basic_clk_name"
because we will add "subsys_clk_prefix" in following patch.

> >   * @caps: The flag for active wake-up action.
> >   */
> >  struct scp_domain_data {
> > @@ -127,6 +129,7 @@ struct scp_domain_data {
> >         u32 sram_pdn_ack_bits;
> >         u32 bus_prot_mask;
> >         enum clk_id clk_id[MAX_CLKS];
> > +       const char *basic_clk_id[MAX_CLKS];
> >         u8 caps;
> >  };
> >
> > @@ -493,16 +496,26 @@ static struct scp *init_scp(struct platform_device *pdev,
> >
> >                 scpd->data = data;
> >
> > -               for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) {
> > -                       struct clk *c = clk[data->clk_id[j]];
> > +               if (data->clk_id[0]) {
> > +                       WARN_ON(data->basic_clk_id[0]);
> >
> > -                       if (IS_ERR(c)) {
> > -                               dev_err(&pdev->dev, "%s: clk unavailable\n",
> > -                                       data->name);
> > -                               return ERR_CAST(c);
> > -                       }
> > +                       for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) {
> > +                               struct clk *c = clk[data->clk_id[j]];
> > +
> > +                               if (IS_ERR(c)) {
> > +                                       dev_err(&pdev->dev,
> > +                                               "%s: clk unavailable\n",
> > +                                               data->name);
> > +                                       return ERR_CAST(c);
> > +                               }
> >
> > -                       scpd->clk[j] = c;
> > +                               scpd->clk[j] = c;
> > +                       }
> > +               } else if (data->basic_clk_id[0]) {
> > +                       for (j = 0; j < MAX_CLKS &&
> > +                                       data->basic_clk_id[j]; j++)
> > +                               scpd->clk[j] = devm_clk_get(&pdev->dev,
> > +                                               data->basic_clk_id[j]);
> >                 }
> >
> >                 genpd->name = data->name;
> > --
> > 1.8.1.1.dirty