Re: [PATCH 08/10] clk: mediatek: clk-mt8195-topckgen: Drop univplls from mfg mux parents

[Chen-Yu Tsai]

Hi,

On Mon, Sep 5, 2022 at 6:04 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:
>
> These PLLs are conflicting with GPU rates that can be generated by
> the GPU-dedicated MFGPLL and would require a special clock handler
> to be used, for very little and ignorable power consumption benefits.
> Also, we're in any case unable to set the rate of these PLLs to
> something else that is sensible for this task, so simply drop them:
> this will make the GPU to be clocked exclusively from MFGPLL for
> "fast" rates, while still achieving the right "safe" rate during
> PLL frequency locking.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---
>  drivers/clk/mediatek/clk-mt8195-topckgen.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mt8195-topckgen.c b/drivers/clk/mediatek/clk-mt8195-topckgen.c
> index 4dde23bece66..6ff610c101ae 100644
> --- a/drivers/clk/mediatek/clk-mt8195-topckgen.c
> +++ b/drivers/clk/mediatek/clk-mt8195-topckgen.c
> @@ -301,8 +301,6 @@ static const char * const ipu_if_parents[] = {
>  static const char * const mfg_parents[] = {
>         "clk26m",
>         "mainpll_d5_d2",
> -       "univpll_d6",
> -       "univpll_d7"

I'd just comment them out and leave a note about it. Or remove them but
leave a note. Removed code will not be obvious to others. And given this
is probably the only public documentation of the hardware, it'd be a shame
to lose evidence of it.

ChenYu