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

- From: Sam Protsenko \<semen.protsenko@linaro.org\>
- Date: 2021-08-10 18:17:18 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/08/1473965
- Thread: https://ratatoskr.run/linux-clk/2021/08/1472844/t.md

```text
On Tue, 10 Aug 2021 at 12:32, Krzysztof Kozlowski
[ref] 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 <redacted>
> ---

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 [ref]
> +  - Krzysztof Kozlowski [ref]
> +  - Sylwester Nawrocki [ref]
> +  - Tomasz Figa [ref]
> +
> +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
>

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```