Subject: Re: [PATCH v2 37/52] dt-bindings: usb: dwc3: Fix usb-phy check

From: Felipe Balbi <[email-masked]>
Date: Wed, 01 Sep 2021 15:36:35 +0300

Maxime Ripard <[email-masked]> writes:

> The original binding was allowing any combination of usb2-phy and
> usb3-phy in the phys and phy-names properties.
>
> However, the current binding enforces that those properties must be a
> list of usb2-phy and usb3-phy, with exactly one element, effectively
> making usb2-phy the only value being valid.
>
> Let's rework the properties description to allow either one or two
> element picked with values either usb2-phy or usb3-phy. The rest of the
> tooling makes sure that we don't get any duplicate value, so this should
> be what we want.
>
> Cc: Felipe Balbi <[email-masked]>
> Cc: Greg Kroah-Hartman <[email-masked]>
> Cc: [email-masked]
> Signed-off-by: Maxime Ripard <[email-masked]>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index 078fb7889593..c1c970073681 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -73,15 +73,15 @@ properties:
>  
>    phys:
>      minItems: 1
> -    items:
> -      - description: USB2/HS PHY
> -      - description: USB3/SS PHY
> +    maxItems: 2

I'm not sure you should enforce a maximum of 2 PHYs. Some systems may
use more than one USB2 PHY to take care of different parts of the USB
link.

IIRC N900 was a USB2-only system which shipped with two USB2 PHYs: one
handling the communication proper and one handling charger detection and
the like.

-- 
balbi

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