Re: [PATCH v10 2/4] arm64: dts: mt8183: Add node for the Mali GPU

From: Rob Herring <robh@kernel.org>
To: Nicolas Boichat <drinkcat@chromium.org>
Cc: Steven Price <steven.price@arm.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	fshao@chromium.org, boris.brezillon@collabora.com,
	hsinyi@chromium.org, hoegsberg@chromium.org,
	Matthias Brugger <matthias.bgg@gmail.com>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org
Subject: Re: [PATCH v10 2/4] arm64: dts: mt8183: Add node for the Mali GPU
Date: Mon, 25 Jan 2021 13:26:58 -0600	[thread overview]
Message-ID: <20210125192658.GA806742@robh.at.kernel.org> (raw)
In-Reply-To: <20210113140546.v10.2.I9f45f5c1f975422d58b5904d11546349e9ccdc94@changeid>

On Wed, Jan 13, 2021 at 02:07:01PM +0800, Nicolas Boichat wrote:
> Add a basic GPU node for mt8183.
> 
> Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
> ---
> The binding we use with out-of-tree Mali drivers includes more
> clocks, this is used for devfreq: the out-of-tree driver switches
> clk_mux to clk_sub_parent (26Mhz), adjusts clk_main_parent, then
> switches clk_mux back to clk_main_parent:
> (see https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-4.19/drivers/gpu/arm/midgard/platform/mediatek/mali_kbase_runtime_pm.c#423)
> clocks =
>         <&topckgen CLK_TOP_MFGPLL_CK>,
>         <&topckgen CLK_TOP_MUX_MFG>,
>         <&clk26m>,
>         <&mfgcfg CLK_MFG_BG3D>;
> clock-names =
>         "clk_main_parent",
>         "clk_mux",
>         "clk_sub_parent",
>         "subsys_mfg_cg";
> (based on discussions, this probably belongs in the clock core)
> 
> This only matters for devfreq, that is disabled anyway as we don't
> have platform-specific code to handle >1 supplies.
> 
> (no changes since v6)
> 
> Changes in v6:
>  - Add gpu regulators to kukui dtsi as well.
>  - Power domains are now attached to spm, not scpsys
>  - Drop R-B.
> 
> Changes in v5:
>  - Rename "2d" power domain to "core2" (keep R-B again).
> 
> Changes in v4:
>  - Add power-domain-names to describe the 3 domains.
>    (kept Alyssa's reviewed-by as the change is minor)
> 
> Changes in v3:
>  - No changes
> 
> Changes in v2:
>  - Use sram instead of mali_sram as SRAM supply name.
>  - Rename mali@ to gpu@.
> 
>  arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |   6 +
>  .../arm64/boot/dts/mediatek/mt8183-kukui.dtsi |   6 +
>  arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 105 ++++++++++++++++++
>  3 files changed, 117 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-evb.dts b/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> index cba2d8933e79..0a8c2fad8e16 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> @@ -42,6 +42,12 @@ &auxadc {
>  	status = "okay";
>  };
>  
> +&gpu {
> +	supply-names = "mali", "sram";

Not a documented property, nor should it be.

Did you run this against dtbs_check with your schema changes?

> +	mali-supply = <&mt6358_vgpu_reg>;
> +	sram-supply = <&mt6358_vsram_gpu_reg>;
> +};
> +
>  &i2c0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&i2c_pins_0>;