linux-kernel - Re: [PATCH v1 05/45] clk: mediatek: mt2712: Migrate topckgen/mcucfg to mtk_clk_simple

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Date:   Tue, 7 Feb 2023 16:58:03 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     mturquette@...libre.com, sboyd@...nel.org, matthias.bgg@...il.com,
        johnson.wang@...iatek.com, miles.chen@...iatek.com,
        chun-jie.chen@...iatek.com, daniel@...rotopia.org,
        fparent@...libre.com, msp@...libre.com, nfraprado@...labora.com,
        rex-bc.chen@...iatek.com, zhaojh329@...il.com,
        sam.shih@...iatek.com, edward-jw.yang@...iatek.com,
        yangyingliang@...wei.com, granquet@...libre.com,
        pablo.sun@...iatek.com, sean.wang@...iatek.com,
        chen.zhong@...iatek.com, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v1 05/45] clk: mediatek: mt2712: Migrate topckgen/mcucfg
 to mtk_clk_simple_probe()

On Tue, Feb 7, 2023 at 4:45 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 07/02/23 07:15, Chen-Yu Tsai ha scritto:
> > On Mon, Feb 6, 2023 at 11:29 PM AngeloGioacchino Del Regno
> > <angelogioacchino.delregno@...labora.com> wrote:
> >>
> >> Now that the common mtk_clk_simple_{probe,remove}() functions can deal
> >> with divider clocks it is possible to migrate more clock drivers to it:
> >> in this case, it's about topckgen.
> >> While at it, also perform a fast migration for mcucfg.
> >>
> >> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> >
> > Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
> >
> >> ---
> >>   drivers/clk/mediatek/clk-mt2712.c | 127 +++++-------------------------
> >>   1 file changed, 21 insertions(+), 106 deletions(-)
> >>
>
> ..snip..
>                       __func__, r);
> >> +static const struct mtk_clk_desc topck_desc = {
> >> +       .clks = top_clks,
> >> +       .num_clks = ARRAY_SIZE(top_clks),
> >> +       .fixed_clks = top_fixed_clks,
> >> +       .num_fixed_clks = ARRAY_SIZE(top_fixed_clks),
> >> +       .factor_clks = top_divs,
> >> +       .num_factor_clks = ARRAY_SIZE(top_divs),
> >> +       .composite_clks = top_muxes,
> >> +       .num_composite_clks = ARRAY_SIZE(top_muxes),
> >> +       .divider_clks = top_adj_divs,
> >> +       .num_divider_clks = ARRAY_SIZE(top_adj_divs),
> >> +       .clk_lock = &mt2712_clk_lock,
> >
> > At some point maybe we should look into splitting up the locks to one
> > per block, or converting everything to regmap.
> >
>
> I was thinking the same about the locks... but about regmap, that would
> actually add up some overhead at every R/W operation and I would really
> like to measure that precisely before doing any kind of regmap conversion
> for the MediaTek clocks.
>
> Perhaps I'll even find a way to avoid any kind of (even if small) overhead
> while doing that sometime in the future, which wouldn't be benefitting only
> MediaTek, but also other users like Qualcomm (as they have practically all
> clocks on regmap!).

Stephen would likely appreciate a unified regmap clock library :D