RE: [PATCH v7 1/6] dt-bindings: mailbox: allow mbox-cells to be equal to 0

[A.s. Dong]

> -----Original Message-----
> From: Jassi Brar [mailto:jassisinghbrar@xxxxxxxxx]
> Sent: Thursday, July 26, 2018 5:42 PM
> To: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>; Fabio Estevam
> <fabio.estevam@xxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Mark
> Rutland <mark.rutland@xxxxxxx>; A.s. Dong <aisheng.dong@xxxxxxx>;
> Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>; Sudeep Holla
> <sudeep.holla@xxxxxxx>; Devicetree List <devicetree@xxxxxxxxxxxxxxx>;
> Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>; , Sascha Hauer
> <kernel@xxxxxxxxxxxxxx>; , linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-
> mediatek@xxxxxxxxxxxxxxxxxxx, srv_heupstream <linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx>; dl-linux-imx <linux-imx@xxxxxxx>
> Subject: Re: [PATCH v7 1/6] dt-bindings: mailbox: allow mbox-cells to be
> equal to 0
> 
> On Thu, Jul 26, 2018 at 12:23 PM, Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> wrote:
> > From: Dong Aisheng <aisheng.dong@xxxxxxx>
> >
> > Mailbox devices may have only one channel which means the mbox-cells
> > at least 1 does not make sense for this type devices. Let's remove
> > that limitation to allow the mbox-cells to be equal to 0.
> >
> OK
> 
> But please realise that you'll have to write more code -- implement your own
> of_xlate() callback.
> Most developers would prefer to call the only channel as channel number 0,
> and use the common of_xlate implementation.
> 

Yes, that's true because the common of_xlate assuming the mbox-cells is 1.
And there's already such users:
arch/arm/boot/dts/bcm283x.dtsi

More comments will be on your reply of patch-3.

Regards
Dong Aisheng

> -jassi