On Fri, Sep 05, 2025 at 12:22:57PM +0200, Nicolas Frattaroli wrote: > The Mali-based GPU on the MediaTek MT8196 SoC is shackled to its concept > of "MFlexGraphics", which in this iteration includes an embedded MCU > that needs to be poked to power on the GPU, and is in charge of > controlling all the clocks and regulators. > > In return, it lets us omit the OPP tables from the device tree, as those > can now be enumerated at runtime from the MCU. > > Add the mediatek,mt8196-mali compatible, and a performance-controller > property which points to a node representing such setups. It's required > on mt8196 devices. > > Signed-off-by: Nicolas Frattaroli <nicolas.frattar...@collabora.com> > --- > .../bindings/gpu/arm,mali-valhall-csf.yaml | 36 > +++++++++++++++++++++- > 1 file changed, 35 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-valhall-csf.yaml > b/Documentation/devicetree/bindings/gpu/arm,mali-valhall-csf.yaml > index > a5b4e00217587c5d1f889094e2fff7b76e6148eb..6df802e900b744d226395c29f8d87fb6d3282d26 > 100644 > --- a/Documentation/devicetree/bindings/gpu/arm,mali-valhall-csf.yaml > +++ b/Documentation/devicetree/bindings/gpu/arm,mali-valhall-csf.yaml > @@ -19,6 +19,7 @@ properties: > - items: > - enum: > - rockchip,rk3588-mali > + - mediatek,mt8196-mali > - const: arm,mali-valhall-csf # Mali Valhall GPU model/revision > is fully discoverable > > reg: > @@ -53,6 +54,13 @@ properties: > opp-table: > type: object > > + performance-controller: > + $ref: /schemas/types.yaml#/definitions/phandle > + description: > + A phandle of a device that controls this GPU's power and frequency, > + if any. If present, this is usually in the form of some specialised > + embedded MCU.
We already abuse power-domains binding with both power and performance. There's a performance-domain binding too, but only used on one platform for CPUs (Mediatek too IIRC). Or perhaps you could just point to an empty OPP table. I don't think you have anything new here, so don't invent something new. Rob
