Re: [PATCH 9/9] arm64: dts: imx95: Describe Mali G310 GPU

[Frank Li <Frank.li@nxp.com>]

On Thu, Feb 27, 2025 at 05:58:09PM +0100, Marek Vasut wrote:
> The instance of the GPU populated in i.MX95 is the G310,
> describe this GPU in the DT. Include description of the
> GPUMIX block controller, which can be operated as a simple
> reset. Include dummy GPU voltage regulator and OPP tables.
>
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Boris Brezillon <boris.brezillon@collabora.com>
> Cc: Conor Dooley <conor+dt@kernel.org>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
> Cc: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Sebastian Reichel <sre@kernel.org>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Simona Vetter <simona@ffwll.ch>
> Cc: Steven Price <steven.price@arm.com>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: devicetree@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: imx@lists.linux.dev
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  arch/arm64/boot/dts/freescale/imx95.dtsi | 62 ++++++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi b/arch/arm64/boot/dts/freescale/imx95.dtsi
> index 3af13173de4bd..36bad211e5558 100644
> --- a/arch/arm64/boot/dts/freescale/imx95.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx95.dtsi
> @@ -249,6 +249,37 @@ dummy: clock-dummy {
>  		clock-output-names = "dummy";
>  	};
>
> +	gpu_fixed_reg: fixed-gpu-reg {
> +		compatible = "regulator-fixed";
> +		regulator-min-microvolt = <920000>;
> +		regulator-max-microvolt = <920000>;
> +		regulator-name = "vdd_gpu";
> +		regulator-always-on;
> +		regulator-boot-on;

Does really need regulator-boot-on and regulator-always-on ?

> +	};
> +
> +	gpu_opp_table: opp_table {
> +		compatible = "operating-points-v2";
> +
> +		opp-500000000 {
> +			opp-hz = /bits/ 64 <500000000>;
> +			opp-hz-real = /bits/ 64 <500000000>;
> +			opp-microvolt = <920000>;
> +		};
> +
> +		opp-800000000 {
> +			opp-hz = /bits/ 64 <800000000>;
> +			opp-hz-real = /bits/ 64 <800000000>;
> +			opp-microvolt = <920000>;
> +		};
> +
> +		opp-1000000000 {
> +			opp-hz = /bits/ 64 <1000000000>;
> +			opp-hz-real = /bits/ 64 <1000000000>;
> +			opp-microvolt = <920000>;
> +		};
> +	};
> +
>  	clk_ext1: clock-ext1 {
>  		compatible = "fixed-clock";
>  		#clock-cells = <0>;
> @@ -1846,6 +1877,37 @@ netc_emdio: mdio@0,0 {
>  			};
>  		};
>
> +		gpu_blk_ctrl: reset-controller@4d810000 {
> +			compatible = "fsl,imx95-gpu-blk-ctrl";
> +			reg = <0x0 0x4d810000 0x0 0xc>;
> +			#reset-cells = <1>;
> +			clocks = <&scmi_clk IMX95_CLK_GPUAPB>;
> +			assigned-clocks = <&scmi_clk IMX95_CLK_GPUAPB>;
> +			assigned-clock-parents = <&scmi_clk IMX95_CLK_SYSPLL1_PFD1_DIV2>;
> +			assigned-clock-rates = <133333333>;
> +			power-domains = <&scmi_devpd IMX95_PD_GPU>;
> +			status = "disabled";
> +		};
> +
> +		gpu: gpu@4d900000 {
> +			compatible = "fsl,imx95-mali", "arm,mali-valhall-csf";
> +			reg = <0 0x4d900000 0 0x480000>;
> +			clocks = <&scmi_clk IMX95_CLK_GPU>;
> +			clock-names = "core";
> +			interrupts = <GIC_SPI 288 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 289 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 290 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "gpu", "job", "mmu";
> +			mali-supply = <&gpu_fixed_reg>;
> +			operating-points-v2 = <&gpu_opp_table>;
> +			power-domains = <&scmi_devpd IMX95_PD_GPU>, <&scmi_perf IMX95_PERF_GPU>;
> +			power-domain-names = "mix", "perf";
> +			resets = <&gpu_blk_ctrl 0>;
> +			#cooling-cells = <2>;
> +			dynamic-power-coefficient = <1013>;
> +			status = "disabled";

GPU is internal module, which have not much dependence with other module
such as pinmux. why not default status is "disabled". Supposed gpu driver
will turn off clock and power if not used.

Frank

> +		};
> +
>  		ddr-pmu@4e090dc0 {
>  			compatible = "fsl,imx95-ddr-pmu", "fsl,imx93-ddr-pmu";
>  			reg = <0x0 0x4e090dc0 0x0 0x200>;
> --
> 2.47.2
>