linux-kernel - Re: [PATCH v5 2/5] dt-bindings: arm: msm: Convert kpss-acc driver Documentation to yaml

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Date:   Fri, 16 Sep 2022 14:17:15 -0500
From:   Rob Herring <robh@...nel.org>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Takashi Iwai <tiwai@...e.de>,
        Christian Brauner <brauner@...nel.org>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Marc Herbert <marc.herbert@...el.com>,
        James Smart <jsmart2021@...il.com>,
        Justin Tee <justin.tee@...adcom.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v5 2/5] dt-bindings: arm: msm: Convert kpss-acc driver
 Documentation to yaml

On Wed, Sep 14, 2022 at 04:22:53PM +0200, Christian Marangi wrote:
> Convert kpss-acc driver Documentation to yaml.
> The original Documentation was wrong all along. Fix it while we are
> converting it.
> The example was wrong as kpss-acc-v2 should only expose the regs but we
> don't have any driver that expose additional clocks. The kpss-acc driver
> is only specific to v1. For this exact reason, limit all the additional
> bindings (clocks, clock-names, clock-output-names and #clock-cells) to
> v1 and also flag that these bindings should NOT be used for v2.

Odd that a clock controller has no clocks, but okay.

> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  .../bindings/arm/msm/qcom,kpss-acc.txt        | 49 ----------
>  .../bindings/arm/msm/qcom,kpss-acc.yaml       | 93 +++++++++++++++++++

As this is a clock controller, please move to bindings/clock/

>  2 files changed, 93 insertions(+), 49 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
>  create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.yaml

> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.yaml b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.yaml
> new file mode 100644
> index 000000000000..5e16121d9f0d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.yaml
> @@ -0,0 +1,93 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/msm/qcom,kpss-acc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Krait Processor Sub-system (KPSS) Application Clock Controller (ACC)
> +
> +maintainers:
> +  - Christian Marangi <ansuelsmth@...il.com>
> +
> +description: |

Don't need '|' if no formatting to preserve.

> +  The KPSS ACC provides clock, power domain, and reset control to a Krait CPU.
> +  There is one ACC register region per CPU within the KPSS remapped region as
> +  well as an alias register region that remaps accesses to the ACC associated
> +  with the CPU accessing the region.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,kpss-acc-v1
> +      - qcom,kpss-acc-v2
> +
> +  reg:
> +    items:
> +      - description: Base address and size of the register region
> +      - description: Optional base address and size of the alias register region
> +
> +  clocks:
> +    items:
> +      - description: phandle to pll8_vote

Always a phandle (and arg), so that's redundant. Really, if there's not 
more to add that what clock-names says, then just 'maxItems: 2' is fine.

> +      - description: phandle to pxo_board
> +
> +  clock-names:
> +    items:
> +      - const: pll8_vote
> +      - const: pxo
> +
> +  clock-output-names:
> +    description: Name of the aux clock. Krait can have at most 4 cpu.
> +    enum:
> +      - acpu0_aux
> +      - acpu1_aux
> +      - acpu2_aux
> +      - acpu3_aux
> +
> +  '#clock-cells':
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        const: qcom,kpss-acc-v1
> +then:
> +  required:
> +    - clocks
> +    - clock-names
> +    - clock-output-names
> +    - '#clock-cells'
> +else:
> +  properties:
> +    clocks: false
> +    clock-names: false
> +    clock-output-names: false
> +    '#clock-cells': false
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-ipq806x.h>
> +
> +    clock-controller@...8000 {
> +      compatible = "qcom,kpss-acc-v1";
> +      reg = <0x02088000 0x1000>, <0x02008000 0x1000>;
> +      clocks = <&gcc PLL8_VOTE>, <&pxo_board>;
> +      clock-names = "pll8_vote", "pxo";
> +      clock-output-names = "acpu0_aux";
> +      #clock-cells = <0>;
> +    };
> +
> +  - |
> +    clock-controller@...88000 {
> +      compatible = "qcom,kpss-acc-v2";
> +      reg = <0xf9088000 0x1000>,
> +            <0xf9008000 0x1000>;
> +    };
> +...
> -- 
> 2.37.2
> 
>