[PATCH 4/5] dt-bindings: mmc: Add Broadcom optional sdio_freq clock
Krzysztof Kozlowski
krzysztof.kozlowski at linaro.org
Fri Apr 22 10:07:10 PDT 2022
On 21/04/2022 20:28, Kamal Dasu wrote:
> The 72116B0 has improved SDIO controllers that allow the max clock
> rate to be increased from a max of 100MHz to a max of 150MHz.
> Optional "sdio_freq" clock is used to drive the bus clock if present
> optional property "clock-frequency" specifies a base clock frequency
> in Hz that overrides the base clock frequency in the CAPS registers.
>
> Signed-off-by: Kamal Dasu <kdasu.kdev at gmail.com>
> ---
> .../bindings/mmc/brcm,sdhci-brcmstb.yaml | 29 +++++++++++++++----
> 1 file changed, 24 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml b/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
> index dccd5ad96981..1b45a918400a 100644
> --- a/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
> +++ b/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
> @@ -10,8 +10,6 @@ maintainers:
> - Al Cooper <alcooperx at gmail.com>
> - Florian Fainelli <f.fainelli at gmail.com>
>
> -allOf:
> - - $ref: mmc-controller.yaml#
>
> properties:
> compatible:
> @@ -42,23 +40,44 @@ properties:
> maxItems: 1
>
> clocks:
> - maxItems: 1
> - description:
> - handle to core clock for the sdhci controller.
> + minItems: 1
> + items:
> + - description: handle to core clock for the sdhci controller
> + - description: improved 150Mhz clock for sdhci controller (Optional clock)
>
> clock-names:
> + minItems: 1
> items:
> - const: sw_sdio
> + - const: sdio_freq # Optional clock
> +
> + clock-frequency:
> + description: Should be the frequency (in Hz) of the base controller clock
> + minimum: 400000
> + maximum: 150000000
Why do you need this property? The mmc-controller.yaml already has
max-frequency, so maybe that suits your needs?
Best regards,
Krzysztof
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