linux-kernel - Re: [PATCH v2 2/2] dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW

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Message-ID: <20200825020423.GA3775564@bogus>
Date:   Mon, 24 Aug 2020 20:04:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Hector Yuan <hector.yuan@...iatek.com>
Cc:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Vinod Koul <vkoul@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Anson Huang <Anson.Huang@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
        wsd_upstream@...iatek.com
Subject: Re: [PATCH v2 2/2] dt-bindings: cpufreq: add bindings for MediaTek
 cpufreq HW

On Thu, Aug 13, 2020 at 03:07:55PM +0800, Hector Yuan wrote:
> From: "Hector.Yuan" <hector.yuan@...iatek.com>
> 
> Add devicetree bindings for MediaTek HW driver.
> 
> Signed-off-by: Hector.Yuan <hector.yuan@...iatek.com>
> ---
>  .../bindings/cpufreq/cpufreq-mediatek-hw.yaml      |   61 ++++++++++++++++++++
>  1 file changed, 61 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
> 
> diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
> new file mode 100644
> index 0000000..59bb24e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/cpufreq/cpufreq-mediatek-hw.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek's CPUFREQ Bindings
> +
> +maintainers:
> +  - Hector Yuan <hector.yuan@...iatek.com>
> +
> +description:
> +  CPUFREQ HW is a hardware engine used by MediaTek
> +  SoCs to manage frequency in hardware. It is capable of controlling frequency
> +  for multiple clusters.
> +
> +properties:
> +  compatible:
> +    const: mediatek,cpufreq-hw
> +
> +  reg:
> +    minItems: 1
> +    maxItems: 2
> +    description: |
> +      Addresses and sizes for the memory of the HW bases in each frequency domain.
> +
> +  reg-names:
> +    items:
> +      - const: "freq-domain0"
> +      - const: "freq-domain1"

Not all that useful of a name given it's based on the index.

> +    description: |
> +      Frequency domain name.
> +
> +  "#freq-domain-cells":
> +    const: 1
> +    description: |
> +      Number of cells in a freqency domain specifier.

What's this for?

> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - "#freq-domain-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        cpufreq_hw: cpufreq@...c00 {
> +            compatible = "mediatek,cpufreq-hw";
> +            reg = <0 0x11bc10 0 0x8c>,
> +               <0 0x11bca0 0 0x8c>;
> +            reg-names = "freq-domain0", "freq-domain1";
> +            #freq-domain-cells = <1>;
> +        };
> +    };
> +
> -- 
> 1.7.9.5