linux-kernel - Re: [PATCH 1/2] dt-bindings: power: Add Allwinner D1 PPU

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Message-ID: <b63e8e05-6ca0-ea77-bfb8-f9ecca2ebdcc@sholland.org>
Date:   Sat, 31 Dec 2022 13:12:30 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/2] dt-bindings: power: Add Allwinner D1 PPU

On 12/31/22 12:58, Krzysztof Kozlowski wrote:
> On 31/12/2022 17:04, Samuel Holland wrote:
>> The Allwinner D1 family of SoCs contain a "PPU" power domain controller
>> separate from the PRCM. It can power down the video engine and DSP, and
>> it contains special logic for hardware-assisted CPU idle. Other recent
>> Allwinner SoCs (e.g. TV303) have a PPU with a different set of domains.
>>
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
>> ---
>>
>>  .../power/allwinner,sun20i-d1-ppu.yaml        | 54 +++++++++++++++++++
>>  .../power/allwinner,sun20i-d1-ppu.h           | 10 ++++
>>  2 files changed, 64 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml
>>  create mode 100644 include/dt-bindings/power/allwinner,sun20i-d1-ppu.h
>>
>> diff --git a/Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml b/Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml
>> new file mode 100644
>> index 000000000000..64c9a9f398a2
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml
>> @@ -0,0 +1,54 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/power/allwinner,sun20i-d1-ppu.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Allwinner SoCs "PPU" power domain controller
> 
> Drop quotes over "PPU" - it's not some nickname, alias, but acronym.
> Explain the acronym in description.

I don't know what the acronym stands for; it is never spelled out in the
vendor code. I will drop the quotes in v2, but I can't give an explanation.

Regards,
Samuel