linux-kernel - Re: [PATCH V4 2/8] dt-bindings: clock: Add schema for QCOM IPQ apss pll

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Message-ID: <20200512195608.GH2165@builder.lan>
Date:   Tue, 12 May 2020 12:56:08 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sivaprakash Murugesan <sivaprak@...eaurora.org>
Cc:     agross@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, jassisinghbrar@...il.com,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 2/8] dt-bindings: clock: Add schema for QCOM IPQ apss
 pll

On Sun 03 May 23:20 PDT 2020, Sivaprakash Murugesan wrote:

> Add dt-binding for apss pll found on QCOM IPQ platforms
> 
> Signed-off-by: Sivaprakash Murugesan <sivaprak@...eaurora.org>

This seems quite similar to the existing qcom,a53pll binding, can't you
just describe both in the same binding?

> ---
>  .../bindings/clock/qcom,ipq-apsspll.yaml           | 49 ++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/qcom,ipq-apsspll.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,ipq-apsspll.yaml b/Documentation/devicetree/bindings/clock/qcom,ipq-apsspll.yaml
> new file mode 100644
> index 0000000..dd12ec4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/qcom,ipq-apsspll.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/qcom,ipq-apsspll.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm IPQ APSS PLL Binding
> +
> +maintainers:
> +  - Sivaprakash Murugesan <sivaprak@...eaurora.org>
> +
> +description:
> +  The APSS PLL is the main clock that feds the CPUs on QCOM IPQ platforms.
> +  It can support frequencies above 1GHz.
> +
> +properties:
> +  compatible:
> +    const: qcom,ipq-apss-pll

Allow me to claim that this is not the last IPQ, with an APSS PLL, which
means that this compatible is no good.

I think you want a compatible on the format qcom,ipq<numbers>-a53pll.

Regards,
Bjorn

> +
> +  reg:
> +    maxItems: 1
> +
> +  '#clock-cells':
> +    const: 0
> +
> +  clocks:
> +    items:
> +      - description: board XO clock
> +
> +  clock-names:
> +    items:
> +      - const: xo
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#clock-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    a53pll_ipq: clock@...6000 {
> +        compatible = "qcom,ipq-apss-pll";
> +        reg = <0x0b116000 0x40>;
> +        #clock-cells = <0>;
> +        clocks = <&xo>;
> +        clock-names = "xo";
> +    };
> -- 
> 2.7.4
>