linux-kernel - Re: [PATCH v4 3/6] dt-bindings: power: tegra: Add binding for core power domain

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Date:   Wed, 24 Mar 2021 02:01:29 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Paul Fertser <fercerpav@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/6] dt-bindings: power: tegra: Add binding for core
 power domain

24.03.2021 01:48, Rob Herring пишет:
> On Sun, Mar 14, 2021 at 07:48:07PM +0300, Dmitry Osipenko wrote:
>> All NVIDIA Tegra SoCs have a core power domain where majority of hardware
>> blocks reside. Add binding for the core power domain.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  .../power/nvidia,tegra20-core-domain.yaml     | 51 +++++++++++++++++++
>>  1 file changed, 51 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/power/nvidia,tegra20-core-domain.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/power/nvidia,tegra20-core-domain.yaml b/Documentation/devicetree/bindings/power/nvidia,tegra20-core-domain.yaml
>> new file mode 100644
>> index 000000000000..4692489d780a
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/nvidia,tegra20-core-domain.yaml
>> @@ -0,0 +1,51 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/power/nvidia,tegra20-core-domain.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NVIDIA Tegra Core Power Domain
>> +
>> +maintainers:
>> +  - Dmitry Osipenko <digetx@...il.com>
>> +  - Jon Hunter <jonathanh@...dia.com>
>> +  - Thierry Reding <thierry.reding@...il.com>
>> +
>> +allOf:
>> +  - $ref: power-domain.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - nvidia,tegra20-core-domain
>> +      - nvidia,tegra30-core-domain
>> +
>> +  operating-points-v2:
>> +    description:
>> +      Should contain level, voltages and opp-supported-hw property.
>> +      The supported-hw is a bitfield indicating SoC speedo or process
>> +      ID mask.
>> +
>> +  "#power-domain-cells":
>> +    const: 0
>> +
>> +  power-supply:
>> +    description:
>> +      Phandle to voltage regulator connected to the SoC Core power rail.
>> +
>> +required:
>> +  - compatible
>> +  - operating-points-v2
>> +  - "#power-domain-cells"
>> +  - power-supply
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    power-domain {
>> +        compatible = "nvidia,tegra20-core-domain";
>> +        operating-points-v2 = <&opp_table>;
>> +        power-supply = <&regulator>;
>> +        #power-domain-cells = <0>;
> 
> AFAICT, there's no way to access this 'hardware'?
correct