Re: [PATCH 5/6] arm64: dts: mediatek: mt8173: Fix MFG_ASYNC power domain clock

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 30/05/24 10:35, Chen-Yu Tsai ha scritto:
> The MFG_ASYNC domain, which is likely associated to the whole MFG block,
> currently specifies clk26m as its domain clock. This is bogus, since the
> clock is an external crystal with no controls. Also, the MFG block has
> a independent CLK_TOP_AXI_MFG_IN_SEL clock, which according to the block
> diagram, gates access to the hardware registers. Having this one as the
> domain clock makes much more sense. This also fixes access to the MFGTOP
> registers.
> 
> Change the MFG_ASYNC domain clock to CLK_TOP_AXI_MFG_IN_SEL.
> 
> Fixes: 8b6562644df9 ("arm64: dts: mediatek: Add mt8173 power domain controller")
> Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>

Just one question... what happens if there's no GPU support at all and this
power domain gets powered off?

I expect the answer to be "nothing", so I'm preventively giving you my

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

....but if I'm wrong and the answer isn't exactly "nothing", then I still agree
with this commit, but only after removing the Fixes tag.

Cheers,
Angelo

> ---
>   arch/arm64/boot/dts/mediatek/mt8173.dtsi | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index 3458be7f7f61..136b28f80cc2 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -497,7 +497,7 @@ power-domain@MT8173_POWER_DOMAIN_USB {
>   				};
>   				mfg_async: power-domain@MT8173_POWER_DOMAIN_MFG_ASYNC {
>   					reg = <MT8173_POWER_DOMAIN_MFG_ASYNC>;
> -					clocks = <&clk26m>;
> +					clocks = <&topckgen CLK_TOP_AXI_MFG_IN_SEL>;
>   					clock-names = "mfg";
>   					#address-cells = <1>;
>   					#size-cells = <0>;