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

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Hi Marek,

Am Donnerstag, 27. Februar 2025, 17:58:09 CET schrieb Marek Vasut:
> 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;
> +	};

Is this an internal voltage?

> +
> +	gpu_opp_table: opp_table {

Node-Names use dash instead of underscore.

> +		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>;

Mh, GPU_BLK_CTRL is /just a bit) more than the GPU reset. Does it make sense
to make this an gpu-reset-only node, located at 0x4d810008?

> +			#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>;

There is also IMX95_CLK_GPUAPB. Is this only required for the rese control above?

> +			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";

DT bindings say this order: job, mmu, gpu

Best regards
Alexander

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


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