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SubjectRe: [PATCH v4] dt-bindings: gpu: add bindings for the ARM Mali Bifrost GPU
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On 01/04/2019 09:09, 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@baylibre.com>
> ---
> .../bindings/gpu/arm,mali-bifrost.txt | 92 +++++++++++++++++++
> 1 file changed, 92 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/gpu/arm,mali-bifrost.txt
>
> Changes since v3:
> - Added note about discoverable model/revision
> - Enforced fixed defined irq order
> - Fixed typo in accommodate
>
> 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..711c9ead17a2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.txt
> @@ -0,0 +1,92 @@
> +ARM Mali Bifrost GPU
> +====================
> +
> +Required properties:
> +
> +- compatible :
> + * Since Mali Bifrost GPU model/revision if fully discoverable by reading
^^
s/if/is/

> + some determined registers, must contain the following:
> + + "arm,mali-bifrost"
> + * 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,
> + in the following defined order.
> +
> +- interrupt-names : Contains the names of IRQ resources in this exact defined
> + order: "job", "mmu", "gpu".

Is there any point in having "interrupt-names" if we're fixing the
order? Although I guess it helps match the Midgard bindings.

Steve

> +
> +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 accommodate 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@ffa30000 {
> + 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@533000000 {
> + opp-hz = /bits/ 64 <533000000>;
> + opp-microvolt = <1250000>;
> + };
> + opp@450000000 {
> + opp-hz = /bits/ 64 <450000000>;
> + opp-microvolt = <1150000>;
> + };
> + opp@400000000 {
> + opp-hz = /bits/ 64 <400000000>;
> + opp-microvolt = <1125000>;
> + };
> + opp@350000000 {
> + opp-hz = /bits/ 64 <350000000>;
> + opp-microvolt = <1075000>;
> + };
> + opp@266000000 {
> + opp-hz = /bits/ 64 <266000000>;
> + opp-microvolt = <1025000>;
> + };
> + opp@160000000 {
> + opp-hz = /bits/ 64 <160000000>;
> + opp-microvolt = <925000>;
> + };
> + opp@100000000 {
> + opp-hz = /bits/ 64 <100000000>;
> + opp-microvolt = <912500>;
> + };
> +};
>

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