linux-kernel - Re: [PATCH v1 2/8] dt-bindings: usb: dwc3: add description for rk3568

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Date:   Fri, 25 Feb 2022 17:07:21 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     Peter Geis <pgwipeout@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Michael Riesch <michael.riesch@...fvision.net>
Subject: Re: [PATCH v1 2/8] dt-bindings: usb: dwc3: add description for rk3568

Hi Peter,

Lots of USB series all of a sudden.
Combine possible?

On 2/25/22 15:54, Peter Geis wrote:
> The rk3568 dwc3 controllers are backwards compatible with the rk3399.
> Add the device tree description for it.
> 
> Signed-off-by: Peter Geis <pgwipeout@...il.com>
> ---
>  Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> index 04077f2d7faf..e3044e81cc72 100644
> --- a/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> @@ -30,6 +30,7 @@ select:
>          enum:
>            - rockchip,rk3328-dwc3
>            - rockchip,rk3399-dwc3
> +          - rockchip,rk3568-dwc3
>    required:
>      - compatible
>  
> @@ -39,6 +40,7 @@ properties:
>        - enum:
>            - rockchip,rk3328-dwc3
>            - rockchip,rk3399-dwc3
> +          - rockchip,rk3568-dwc3
>        - const: snps,dwc3
>  
>    reg:
> @@ -75,7 +77,10 @@ properties:
>      maxItems: 1
>  
he
>    reset-names:
> -    const: usb3-otg
> +    items:
> +      - enum:
> +          - usb3-otg
> +          - usb3-host

The use of reset-names is "sort of" only related to the rk3399 legacy
node. Still using this sub node DT to not to break older existing boot
loaders.

https://github.com/torvalds/linux/search?q=usb3-otg

It's only mentioned as comment in dwc3-of-simple.c but not used:

 	simple->resets = of_reset_control_array_get(np, false, true,
						    true);
core.c uses something similar.

	dwc->reset = devm_reset_control_array_get_optional_shared(dev);
	if (IS_ERR(dwc->reset))
		return PTR_ERR(dwc->reset);


Up to the maintainers, but I wouldn't add another variant/name for the
same thing as it also optional(= not required) and no longer needed.

Johan

===

Maybe drop PCLK_PIPE as well to reduce notifications.

See example:
https://lore.kernel.org/linux-rockchip/20220225131602.2283499-4-michael.riesch@wolfvision.net/T/#u

>  
>  unevaluatedProperties: false
>