linux-kernel - RE: [PATCH V2 1/2] dt-bindings: firmware: arm,scmi: introduce property mbox-rx-timeout-ms

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Message-ID:
 <AM6PR04MB5941F61DFB15AFDA384C153A88DE2@AM6PR04MB5941.eurprd04.prod.outlook.com>
Date: Thu, 4 Jul 2024 12:33:09 +0000
From: Peng Fan <peng.fan@....com>
To: Sudeep Holla <sudeep.holla@....com>
CC: "Peng Fan (OSS)" <peng.fan@....nxp.com>, "cristian.marussi@....com"
	<cristian.marussi@....com>, "robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "arm-scmi@...r.kernel.org"
	<arm-scmi@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: RE: [PATCH V2 1/2] dt-bindings: firmware: arm,scmi: introduce
 property mbox-rx-timeout-ms

> Subject: Re: [PATCH V2 1/2] dt-bindings: firmware: arm,scmi: introduce
> property mbox-rx-timeout-ms
> 
> On Thu, Jul 04, 2024 at 10:39:53AM +0000, Peng Fan wrote:
> > > Subject: Re: [PATCH V2 1/2] dt-bindings: firmware: arm,scmi:
> > > introduce property mbox-rx-timeout-ms
> > >
> > > On Wed, Jul 03, 2024 at 11:17:14AM +0800, Peng Fan (OSS) wrote:
> > > > From: Peng Fan <peng.fan@....com>
> > > >
> > > > System Controller Management Interface(SCMI) firmwares might
> > > have
> > > > different designs by SCMI firmware developers. So the maximum
> > > receive
> > > > channel timeout value might also varies in the various designs.
> > > >
> > > > So introduce property mbox-rx-timeout-ms to let each platform
> > > > could set its own timeout value in device tree.
> > > >
> > > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > > ---
> > > >
> > > > V2:
> > > >  Drop defaults, update description.
> > > >
> > > >  Documentation/devicetree/bindings/firmware/arm,scmi.yaml | 6
> > > ++++++
> > > >  1 file changed, 6 insertions(+)
> > > >
> > > > diff --git
> > > a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > > > b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > > > index ebf384e76df1..dcac0b36c76f 100644
> > > > ---
> a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > > > +++
> b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> > > > @@ -121,6 +121,12 @@ properties:
> > > >        atomic mode of operation, even if requested.
> > > >      default: 0
> > > >
> > > > +  max-rx-timeout-ms:
> > > > +    description:
> > > > +      An optional time value, expressed in milliseconds,
> > > > + representing
> > > the
> > > > +      mailbox maximum timeout value for receive channel. The
> > > > + value
> > > should
> > > > +      be a non-zero value if set.
> > > > +
> > >
> > > IIRC, you had the min and max constraint in the earlier response.
> > > You need to have rushed and posted another version before I could
> > > respond with my preference.
> > >
> > > So there is no rush, these are v6.12 material. Take time for
> > > respining and give some time for the review.
> >
> > Sure. I just not sure what the maximum should be set, so I drop the
> > minimum and maximum from my previous email.
> >
> 
> Worst case we can just have min constraint to indicate it must be non-
> zero value as you have mentioned above and drop that statement as it
> becomes explicit with the constraint.

I'll use below in v3:
  max-rx-timeout-ms:                                                                                
    description:                                                                                    
      An optional time value, expressed in milliseconds, representing the                           
      mailbox maximum timeout value for receive channel. The value should                           
      be a non-zero value if set.                                                                   
    minimum: 1

Put the binding away, when you have time, please check
whether the driver changes are good or not.
BTW, since our Android team is waiting for this patchset
got R-b or A-b, then the patches could be accepted by Google common
kernel, we could support GKI in our release which is soon in near
days. So I am being pushed :) 

Thanks,
Peng

> 
> --
> Regards,
> Sudeep