linux-kernel - Re: [PATCH v3] dt-bindings: gpu: add bindings for the ARM Mali Bifrost GPU

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Date:   Wed, 27 Mar 2019 15:39:59 -0500
From:   Rob Herring <robh@...nel.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] dt-bindings: gpu: add bindings for the ARM Mali
 Bifrost GPU

On Mon, Mar 04, 2019 at 11:58:02AM +0100, Neil Armstrong wrote:
> Add the bindings for the Bifrost family of ARM Mali GPUs.
> 
> The Bifrost GPU architecture is similar to the Midgard family,
> but with a different Shader Core & Execution Engine structures.
> 
> Bindings are based on the Midgard family bindings, but the inner
> architectural changes makes it a separate family needing separate
> bindings.
> 
> The Bifrost GPUs are present in a number of recent SoCs, like the
> Amlogic G12A Family, and many other vendors.
> The Amlogic vendor specific compatible is added to handle the
> specific IP integration differences and dependencies.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  .../bindings/gpu/arm,mali-bifrost.txt         | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpu/arm,mali-bifrost.txt
> 
> Changes since v2:
> - moved to a single compatible since HW is fully discoverable
> 
> diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.txt b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.txt
> new file mode 100644
> index 000000000000..e068fccf4ce9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.txt
> @@ -0,0 +1,90 @@
> +ARM Mali Bifrost GPU
> +====================
> +
> +Required properties:
> +
> +- compatible :
> +  * Must contain one the following:
> +    + "arm,mali-bifrost"

Perhaps a note that the specific model/revision is discoverable.

> +  * which must be preceded by one of the following vendor specifics:
> +    + "amlogic,meson-g12a-mali"
> +
> +- reg : Physical base address of the device and length of the register area.
> +
> +- interrupts : Contains the three IRQ lines required by Mali Bifrost devices.
> +
> +- interrupt-names : Contains the names of IRQ resources in the order they were
> +  provided in the interrupts property. Must contain: "job", "mmu", "gpu".

Please make the order defined.

> +
> +Optional properties:
> +
> +- clocks : Phandle to clock for the Mali Bifrost device.
> +
> +- mali-supply : Phandle to regulator for the Mali device. Refer to
> +  Documentation/devicetree/bindings/regulator/regulator.txt for details.
> +
> +- operating-points-v2 : Refer to Documentation/devicetree/bindings/opp/opp.txt
> +  for details.
> +
> +- resets : Phandle of the GPU reset line.
> +
> +Vendor-specific bindings
> +------------------------
> +
> +The Mali GPU is integrated very differently from one SoC to
> +another. In order to accomodate those differences, you have the option
> +to specify one more vendor-specific compatible, among:
> +
> +- "amlogic,meson-g12a-mali"
> +  Required properties:
> +  - resets : Should contain phandles of :
> +    + GPU reset line
> +    + GPU APB glue reset line
> +
> +Example for a Mali-G31:
> +
> +gpu@...30000 {
> +	compatible = "amlogic,meson-g12a-mali", "arm,mali-bifrost";
> +	reg = <0xffe40000 0x10000>;
> +	interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
> +		     <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,
> +		     <GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>;
> +	interrupt-names = "job", "mmu", "gpu";
> +	clocks = <&clk CLKID_MALI>;
> +	mali-supply = <&vdd_gpu>;
> +	operating-points-v2 = <&gpu_opp_table>;
> +	resets = <&reset RESET_DVALIN_CAPB3>, <&reset RESET_DVALIN>;
> +};
> +
> +gpu_opp_table: opp_table0 {
> +	compatible = "operating-points-v2";
> +
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <533000000>;
> +		opp-microvolt = <1250000>;
> +	};
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <450000000>;
> +		opp-microvolt = <1150000>;
> +	};
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <400000000>;
> +		opp-microvolt = <1125000>;
> +	};
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <350000000>;
> +		opp-microvolt = <1075000>;
> +	};
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <266000000>;
> +		opp-microvolt = <1025000>;
> +	};
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <160000000>;
> +		opp-microvolt = <925000>;
> +	};
> +	opp@...000000 {
> +		opp-hz = /bits/ 64 <100000000>;
> +		opp-microvolt = <912500>;
> +	};
> +};
> -- 
> 2.20.1
>