Re: [PATCH] arm64: dts: mt8183: Add node for the Mali GPU

From: Rob Herring
Date: Thu Sep 05 2019 - 05:09:34 EST

On Thu, Sep 5, 2019 at 9:16 AM Nicolas Boichat <drinkcat@xxxxxxxxxxxx> wrote:
>
> Add a basic GPU node and opp table for mt8183.
>
> The binding we use with out-of-tree Mali drivers includes more
> clocks, I assume this would be required eventually if we have an
> in-tree driver:

We have an in-tree driver...

> 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";
>
> Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
>
> ---
> Upstreaming what matches existing bindings from our Chromium OS tree:
> https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-4.19/arch/arm64/boot/dts/mediatek/mt8183.dtsi#1348
>
> The evb part of this change depends on this patch to add PMIC dtsi:
> https://patchwork.kernel.org/patch/10928161/
>
> arch/arm64/boot/dts/mediatek/mt8183-evb.dts | 7 ++
> arch/arm64/boot/dts/mediatek/mt8183.dtsi | 103 ++++++++++++++++++++
> 2 files changed, 110 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-evb.dts b/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> index 1fb195c683c3d01..200d8e65a6368a1 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> @@ -7,6 +7,7 @@
>
> /dts-v1/;
> #include "mt8183.dtsi"
> +#include "mt6358.dtsi"
>
> / {
> model = "MediaTek MT8183 evaluation board";
> @@ -30,6 +31,12 @@
> status = "okay";
> };
>
> +&gpu {
> + supply-names = "mali", "mali_sram";
> + mali-supply = <&mt6358_vgpu_reg>;
> + mali_sram-supply = <&mt6358_vsram_gpu_reg>;

Not documented. Just 'sram-supply' is enough.

Note that the binding doc queued up for 5.4 has been converted to DT schema.

> +};
> +
> &i2c0 {
> pinctrl-names = "default";
> pinctrl-0 = <&i2c_pins_0>;
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183.dtsi b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> index 97f84aa9fc6e1c1..8ea548a762ea252 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> @@ -579,6 +579,109 @@
> #clock-cells = <1>;
> };
>
> + gpu: mali@13040000 {

gpu@...

> + compatible = "mediatek,mt8183-mali", "arm,mali-bifrost";

You need to add this compatible string too.

> + reg = <0 0x13040000 0 0x4000>;
> + interrupts =
> + <GIC_SPI 280 IRQ_TYPE_LEVEL_LOW>,
> + <GIC_SPI 279 IRQ_TYPE_LEVEL_LOW>,
> + <GIC_SPI 278 IRQ_TYPE_LEVEL_LOW>;
> + interrupt-names = "job", "mmu", "gpu";
> +
> + clocks = <&topckgen CLK_TOP_MFGPLL_CK>;
> + power-domains =
> + <&scpsys MT8183_POWER_DOMAIN_MFG_CORE0>,
> + <&scpsys MT8183_POWER_DOMAIN_MFG_CORE1>,
> + <&scpsys MT8183_POWER_DOMAIN_MFG_2D>;

This needs to be documented too.

> +
> + operating-points-v2 = <&gpu_opp_table>;
> + };
> +
> + gpu_opp_table: opp_table0 {
> + compatible = "operating-points-v2";
> + opp-shared;
> +
> + opp-300000000 {
> + opp-hz = /bits/ 64 <300000000>;
> + opp-microvolt = <625000>, <850000>;
> + };
> +
> + opp-320000000 {
> + opp-hz = /bits/ 64 <320000000>;
> + opp-microvolt = <631250>, <850000>;
> + };
> +
> + opp-340000000 {
> + opp-hz = /bits/ 64 <340000000>;
> + opp-microvolt = <637500>, <850000>;
> + };
> +
> + opp-360000000 {
> + opp-hz = /bits/ 64 <360000000>;
> + opp-microvolt = <643750>, <850000>;
> + };
> +
> + opp-380000000 {
> + opp-hz = /bits/ 64 <380000000>;
> + opp-microvolt = <650000>, <850000>;
> + };
> +
> + opp-400000000 {
> + opp-hz = /bits/ 64 <400000000>;
> + opp-microvolt = <656250>, <850000>;
> + };
> +
> + opp-420000000 {
> + opp-hz = /bits/ 64 <420000000>;
> + opp-microvolt = <662500>, <850000>;
> + };
> +
> + opp-460000000 {
> + opp-hz = /bits/ 64 <460000000>;
> + opp-microvolt = <675000>, <850000>;
> + };
> +
> + opp-500000000 {
> + opp-hz = /bits/ 64 <500000000>;
> + opp-microvolt = <687500>, <850000>;
> + };
> +
> + opp-540000000 {
> + opp-hz = /bits/ 64 <540000000>;
> + opp-microvolt = <700000>, <850000>;
> + };
> +
> + opp-580000000 {
> + opp-hz = /bits/ 64 <580000000>;
> + opp-microvolt = <712500>, <850000>;
> + };
> +
> + opp-620000000 {
> + opp-hz = /bits/ 64 <620000000>;
> + opp-microvolt = <725000>, <850000>;
> + };
> +
> + opp-653000000 {
> + opp-hz = /bits/ 64 <653000000>;
> + opp-microvolt = <743750>, <850000>;
> + };
> +
> + opp-698000000 {
> + opp-hz = /bits/ 64 <698000000>;
> + opp-microvolt = <768750>, <868750>;
> + };
> +
> + opp-743000000 {
> + opp-hz = /bits/ 64 <743000000>;
> + opp-microvolt = <793750>, <893750>;
> + };
> +
> + opp-800000000 {
> + opp-hz = /bits/ 64 <800000000>;
> + opp-microvolt = <825000>, <925000>;
> + };

Okay, but I seriously doubt the OPP selection logic is sophisticated
enough or will ever be to use all these levels...

> + };
> +
> mmsys: syscon@14000000 {
> compatible = "mediatek,mt8183-mmsys", "syscon";
> reg = <0 0x14000000 0 0x1000>;
> --
> 2.23.0.187.g17f5b7556c-goog
>