linux-kernel - Re: [PATCH v2 1/7] dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible

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Message-Id: <CX5IDB4IPK92.31F1ICOWQSL84@tleb-bootlin-xps13-01>
Date:   Wed, 22 Nov 2023 18:14:57 +0100
From:   Théo Lebrun <theo.lebrun@...tlin.com>
To:     "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        "Conor Dooley" <conor+dt@...nel.org>,
        "Roger Quadros" <rogerq@...nel.org>,
        "Peter Chen" <peter.chen@...nel.org>,
        "Pawel Laszczak" <pawell@...ence.com>,
        "Nishanth Menon" <nm@...com>,
        "Vignesh Raghavendra" <vigneshr@...com>,
        "Tero Kristo" <kristo@...nel.org>
Cc:     <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Grégory Clement <gregory.clement@...tlin.com>,
        "Conor Dooley" <conor.dooley@...rochip.com>
Subject: Re: [PATCH v2 1/7] dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb
 compatible

Hello,

On Wed Nov 22, 2023 at 1:00 PM CET, Krzysztof Kozlowski wrote:
> On 22/11/2023 11:46, Théo Lebrun wrote:
> >  - properties:
> >    compatible:
> >      oneOf:
> >        - const: ti,j7200-usb
> >        - items:
> >            - const: ti,j721e-usb
> >            - const: ti,am64-usb
> > 
> >    J721E & AM64 are compatible, express that & update devicetrees.
> > 
> > Option one is simpler & doesn't change devicetrees so I'd lean in that
> > direction. What's your opinion?
>
> This one should be for am64.
>
> For your j7200, it depends whether the fallback to j721e makes sense,
> IOW, if the Linux can use j721e compatible solely to use j7200 device.

All compatibles might be equivalent if the reset-on-resume behavior is
observed on all three platforms. I don't have access to J721E or AM64
to test that.

@Roger Quadros: do you have any news if USB suspend/resume works on
J721E and/or AM64? My testing on the J7200 EVM is (1) boot, (2) put
the "USB2.0_MUX_SEL" GPIO high to have USB devices connected without
plugging anything, then (3) trigger a s2idle. I get a memory bus
exception on resume without my patches.

Regards,

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com