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SubjectRe: [PATCH v9 3/9] soc: mediatek: Add basic_clk_id to scp_power_data
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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@mediatek.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@mediatek.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

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