linux-kernel - Re: [PATCH v4] dt-bindings: gpu: add bindings for the ARM Mali Bifrost GPU

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Message-ID: <5CA9CE1A.6060109@baylibre.com>
Date:   Sun, 07 Apr 2019 12:16:58 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     robh@...nel.org
CC:     Steven Price <steven.price@....com>, daniel@...ll.ch,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] dt-bindings: gpu: add bindings for the ARM Mali Bifrost
 GPU

Hi Rob,

Le 01/04/2019 13:24, Neil Armstrong a écrit :
> On 01/04/2019 12:00, Steven Price wrote:
>> 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@...libre.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/

Should I still send a v5 to fixing this typo ? I can fix it while applying it.

Neil

> 
> Thanks for pointing this.
> 
>>
>>> +    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.
> 
> Exact.
> 
> Neil
> 
>>
>> 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@...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>;
>>> +	};
>>> +};
>>>
>>
>