[PATCH v4 2/2] arm64: dts: exynos: Add GPU/Mali Bifrost node to Exynos850

[Sam Protsenko]

On Wed, Sep 9, 2026 at 2:45 PM Thomas Turner <tturner at lineageos.org> wrote:
>
> Add nodes for GPU (Mali Bifrost) to Exynos850. Does not provide support
> for temperature throttling, DVFS, power domains, governor support,
> boosting and voltage control. Once PMIC is properly implemented, support
> will hopefully increase. However, the panfrost driver probes, the
> Mali-G52 GPU initializes and the core clock is set-up.
>
> Testing for this patch was done on a device not currently supported by
> linux, the Galaxy A21s. After enabling this node for that device
> locally, I was able to test and confirm basic GPU functionality. As of
> now, this patch has no users which have tested GPU capabilities and so
> the node has been set to "disabled".
>
> Here are some logs I pulled:
>
> panfrost 11500000.gpu: clock rate = 377000000
> panfrost 11500000.gpu: mali-g52 id 0x7212 major 0x0 minor 0x0 status 0x0
> panfrost 11500000.gpu: features: 00000000,00000df7, issues: 00000000,00000400
> panfrost 11500000.gpu: Features: L2:0x07100206 Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
> panfrost 11500000.gpu: shader_present=0x1 l2_present=0x1
> panfrost 11500000.gpu: [drm] Using Transparent Hugepage
> [drm] Initialized panfrost 1.6.0 for 11500000.gpu on minor 0
>
> OpenGL core profile vendor: Mesa
> OpenGL core profile renderer: Mali-G52 MC1 (Panfrost)
> OpenGL core profile version: 3.1 (Core Profile) Mesa 26.1.6
> OpenGL core profile shading language version: 1.40
> OpenGL compatibility profile vendor: Mesa
> OpenGL compatibility profile renderer: Mali-G52 MC1 (Panfrost)
> OpenGL compatibility profile version: 3.1 (Core Profile) Mesa 26.1.6
> OpenGL compatibility profile shading language version: 1.40
> OpenGL ES profile vendor: Mesa
> OpenGL ES profile renderer: Mali-G52 MC1 (Panfrost)
> OpenGL ES profile version: OpenGL ES 3.1 Mesa 26.1.6
> OpenGL ES profile shading language version: OpenGL ES GLSL ES 3.10
>
> Signed-off-by: Thomas Turner <tturner at lineageos.org>
> Reviewed-and-tested-by: Alexey Klimov <alexey.klimov at linaro.org>
> ---
> Changes in v4:
>   - Add Reviewed-and-tested-by tag
>

If adding the tags is the only change in v4 patch series, there was no
need to submit v4. When maintainers apply your patches they collect
all tags from the latest patch version themselves. So you only need to
collect the tags from the previous version review if you want to
submit the next version for some actual reasons (not just for merely
collecting the tags). Sorry if I forgot to explain it clearly.

> Changes in v3:
>   - Re-word commit message to be less ambiguous
>   - Provide some logs in the commit message
>   - Add a blank line before status property
>
> Changes in v2:
>   - Add a patch addressing the samsung,exynos850-mali compatible string
>
>  arch/arm64/boot/dts/exynos/exynos850.dtsi | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> index 911643008b9f..721b2b2c4ffb 100644
> --- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> @@ -310,6 +310,19 @@ cmu_g3d: clock-controller at 11400000 {
>                         clock-names = "oscclk", "dout_g3d_switch";
>                 };
>
> +               gpu: gpu at 11500000 {
> +                       compatible = "samsung,exynos850-mali", "arm,mali-bifrost";
> +                       reg = <0x11500000 0x5000>;
> +                       interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>,
> +                                    <GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>,
> +                                    <GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>;
> +                       interrupt-names = "job", "mmu", "gpu";
> +                       clocks = <&cmu_g3d CLK_GOUT_G3D_GPU_CLK>;
> +                       clock-names = "core";
> +
> +                       status = "disabled";
> +               };
> +
>                 cmu_apm: clock-controller at 11800000 {
>                         compatible = "samsung,exynos850-cmu-apm";
>                         reg = <0x11800000 0x8000>;
> --
> 2.47.3
>