linux-kernel - Re: [PATCH v2 2/8] dt-bindings: clock: samsung: add bindings for Exynos external clock

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Date:   Tue, 10 Aug 2021 20:49:52 +0300
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/8] dt-bindings: clock: samsung: add bindings for
 Exynos external clock

On Tue, 10 Aug 2021 at 12:32, Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> Document the bindings for Samsung Exynos external to SoC
> (oscclk/XXTI/XusbXTI) clock provided on boards.  The bindings are
> already implemented in most of the Exynos clock drivers and DTS files.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> ---

Just want to mention that remaining users of such fixed clocks can be
converted to regular fixed-rate-clock, and then this binding can be
removed along with samsung_clk_of_register_fixed_ext() API? Just a
thought.

>  .../clock/samsung,exynos-ext-clock.yaml       | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/samsung,exynos-ext-clock.yaml
>
> diff --git a/Documentation/devicetree/bindings/clock/samsung,exynos-ext-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynos-ext-clock.yaml
> new file mode 100644
> index 000000000000..64d027dbe3b2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/samsung,exynos-ext-clock.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/samsung,exynos-ext-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung SoC external/osc/XXTI/XusbXTI clock
> +
> +maintainers:
> +  - Chanwoo Choi <cw00.choi@...sung.com>
> +  - Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> +  - Sylwester Nawrocki <s.nawrocki@...sung.com>
> +  - Tomasz Figa <tomasz.figa@...il.com>
> +
> +description: |
> +  Samsung SoCs require an external clock supplied through XXTI or XusbXTI pins.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - samsung,clock-xxti
> +      - samsung,clock-xusbxti
> +      - samsung,exynos5420-oscclk
> +
> +  "#clock-cells":
> +    const: 0
> +
> +  clock-frequency: true
> +
> +  clock-output-names:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - clock-frequency
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    fixed-rate-clocks {
> +        clock {
> +            compatible = "samsung,clock-xxti";
> +            clock-frequency = <24000000>;
> +        };
> +    };
> --
> 2.30.2
>