Re: [PATCH v5 2/5] dt-bindings: net: wireless: brcm4329-fmac: add clock description for AP6275P

Arend Van Spriel
2024-07-30T06:37:15Z

+ Linus W

On July 30, 2024 5:31:15 AM Jacobe Zang <jacobe.zang@wesion.com> wrote:

> Not only AP6275P Wi-Fi device but also all Broadcom wireless devices allow
> external low power clock input. In DTS the clock as an optional choice in
> the absence of an internal clock.
>
> Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
> Signed-off-by: Jacobe Zang <jacobe.zang@wesion.com>
> ---
> .../bindings/net/wireless/brcm,bcm4329-fmac.yaml | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git
> a/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> b/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> index 2c2093c77ec9a..a3607d55ef367 100644
> --- a/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> +++ b/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> @@ -122,6 +122,14 @@ properties:
> NVRAM. This would normally be filled in by the bootloader from platform
> configuration data.
>
> + clocks:
> + items:
> + - description: External Low Power Clock input (32.768KHz)
> +
> + clock-names:
> + items:
> + - const: lpo
> +

We still have an issue that this clock input is also present in the
bindings specification broadcom-bluetooth.yaml (not in bluetooth
subfolder). This clock is actually a chip resource. What happens if both
are defined and both wifi and bt drivers try to enable this clock? Can this
be expressed in yaml or can we only put a textual warning in the property
descriptions?

Regards,
Arend