linux-kernel - Re: [PATCH v1 2/3] dt-bindings: clock: Add YAML schemas for the QCOM Camera clock bindings.

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Date:   Mon, 14 Sep 2020 17:15:45 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Taniya Das <tdas@...eaurora.org>
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>, devicetree@...r.kernel.org,
        robh@...nel.org, robh+dt@...nel.org,
        Taniya Das <tdas@...eaurora.org>
Subject: Re: [PATCH v1 2/3] dt-bindings: clock: Add YAML schemas for the QCOM Camera clock bindings.

Quoting Taniya Das (2020-09-08 10:07:27)
> The Camera Subsystem clock provider have a bunch of generic properties
> that are needed in a device tree. Add a YAML schemas for those.
> 
> Add clock ids for Camera clocks which are required to bring the camera

Why capitalize camera?

> subsystem out of reset.
> 
> Signed-off-by: Taniya Das <tdas@...eaurora.org>
> ---
>  .../bindings/clock/qcom,sc7180-camcc.yaml          |  73 +++++++++++++
>  include/dt-bindings/clock/qcom,camcc-sc7180.h      | 121 +++++++++++++++++++++
>  2 files changed, 194 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/qcom,sc7180-camcc.yaml
>  create mode 100644 include/dt-bindings/clock/qcom,camcc-sc7180.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,sc7180-camcc.yaml b/Documentation/devicetree/bindings/clock/qcom,sc7180-camcc.yaml
> new file mode 100644
> index 0000000..07bd38e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/qcom,sc7180-camcc.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/qcom,sc7180-camcc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Camera Clock & Reset Controller Binding for SC7180
> +
> +maintainers:
> +  - Taniya Das <tdas@...eaurora.org>
> +
> +description: |
> +  Qualcomm camera clock control module which supports the clocks, resets and
> +  power domains on SC7180.
> +
> +  See also:
> +  - dt-bindings/clock/qcom,camcc-sc7180.h.
> +
> +properties:
> +  compatible:
> +    const: qcom,sc7180-camcc
> +
> +  clocks:
> +    items:
> +      - description: Board XO source

Why do we need board XO

> +      - description: Camera_ahb clock from GCC
> +      - description: Camera XO clock from GCC
> +

And also the gate on XO in GCC? Presumably only the one in GCC should be
going to the camera clock controller?

> +  clock-names:
> +    items:
> +      - const: bi_tcxo
> +      - const: iface
> +      - const: xo
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  '#reset-cells':
> +    const: 1
> +
> +  '#power-domain-cells':
> +    const: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - '#clock-cells'
> +  - '#reset-cells'
> +  - '#power-domain-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-sc7180.h>
> +    #include <dt-bindings/clock/qcom,rpmh.h>
> +    clock-controller@...0000 {
> +      compatible = "qcom,sc7180-camcc";
> +      reg = <0x0ad00000 0x10000>;
> +      clocks = <&rpmhcc RPMH_CXO_CLK>,
> +               <&gcc GCC_CAMERA_AHB_CLK>,
> +               <&gcc GCC_CAMERA_XO_CLK>;
> +      clock-names = "bi_tcxo", "iface", "xo";
> +      #clock-cells = <1>;
> +      #reset-cells = <1>;
> +      #power-domain-cells = <1>;
> +    };
> +...