linux-kernel - Re: [EXT] Re: [PATCH] dt-bindings: usb: Add Marvell ac5

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Date: Mon, 8 Jan 2024 18:01:26 +0000
From: Conor Dooley <conor@...nel.org>
To: Elad Nachman <enachman@...vell.com>
Cc: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH] dt-bindings: usb: Add Marvell ac5

On Mon, Jan 08, 2024 at 05:47:24PM +0000, Elad Nachman wrote:
> 
> 
> > -----Original Message-----
> > From: Conor Dooley <conor@...nel.org>
> > Sent: Monday, January 8, 2024 7:15 PM
> > To: Elad Nachman <enachman@...vell.com>
> > Cc: gregkh@...uxfoundation.org; robh+dt@...nel.org;
> > krzysztof.kozlowski+dt@...aro.org; conor+dt@...nel.org;
> > devicetree@...r.kernel.org; linux-usb@...r.kernel.org; linux-
> > kernel@...r.kernel.org
> > Subject: [EXT] Re: [PATCH] dt-bindings: usb: Add Marvell ac5
> > 
> > External Email
> > 
> > ----------------------------------------------------------------------
> > On Sun, Jan 07, 2024 at 05:25:57PM +0200, Elad Nachman wrote:
> > > From: Elad Nachman <enachman@...vell.com>
> > >
> > > Add Marvell ac5 device tree bindings to generic EHCI.
> > > This compatible enables the Marvell Orion platform code to properly
> > > configure the DMA mask for the Marvell AC5 SOC.
> > >
> > > Signed-off-by: Elad Nachman <enachman@...vell.com>
> > 
> > Maybe I am dumb, but I don't understand how this does what the commit
> > message says. There's no fallback to generic-ehci or any other compatible
> > that is already understood by the driver.
> > 
> > What am I missing?
> 
> Following guidance by Andrew Lunn on my mmc patchset, I have split the patchset
> Into a single patch for dt-bindings review and another for USB driver review.

I don't understand that advice. dt-bindings should (almost) always be
with the driver. Otherwise you just confuse people like me.

Perhaps Andrew meant sending dt*s* patches separately from the driver &
bindings?

Cheers,
Conor.

> 
> The USB driver patch utilizing this new dt bindings compatible string is here:
> 
> https://patchwork.kernel.org/project/linux-usb/patch/20240107163307.3677347-1-enachman@marvell.com/
> 
> > 
> > > ---
> > >  Documentation/devicetree/bindings/usb/generic-ehci.yaml | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/usb/generic-ehci.yaml
> > > b/Documentation/devicetree/bindings/usb/generic-ehci.yaml
> > > index 87986c45be88..2ed178f16a78 100644
> > > --- a/Documentation/devicetree/bindings/usb/generic-ehci.yaml
> > > +++ b/Documentation/devicetree/bindings/usb/generic-ehci.yaml
> > > @@ -77,6 +77,7 @@ properties:
> > >            - const: usb-ehci
> > >        - enum:
> > >            - generic-ehci
> > > +          - marvell,ac5-ehci
> > >            - marvell,armada-3700-ehci
> > >            - marvell,orion-ehci
> > >            - nuvoton,npcm750-ehci
> > > --
> > > 2.25.1
> > >
> 
> Elad.

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