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From:   Jassi Brar <jassisinghbrar@gmail.com>
Date:   Thu, 26 Jul 2018 17:06:46 +0530
Message-ID: <CABb+yY1DQbGnWL=HZc=xPLdJjKgkpdvCHmm6Pr6_MvERR=D56Q@mail.gmail.com>
Subject: Re: [PATCH v7 1/6] dt-bindings: mailbox: allow mbox-cells to be equal
 to 0
To:     "A.s. Dong" <aisheng.dong@nxp.com>
Cc:     Oleksij Rempel <o.rempel@pengutronix.de>,
        Shawn Guo <shawnguo@kernel.org>,
        Fabio Estevam <fabio.estevam@nxp.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Devicetree List <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        ", Sascha Hauer" <kernel@pengutronix.de>,
        ", linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, srv_heupstream" 
        <linux-arm-kernel@lists.infradead.org>,
        dl-linux-imx <linux-imx@nxp.com>
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On Thu, Jul 26, 2018 at 4:30 PM, A.s. Dong <aisheng.dong@nxp.com> wrote:
>> -----Original Message-----
>> From: Jassi Brar [mailto:jassisinghbrar@gmail.com]
>> Sent: Thursday, July 26, 2018 5:42 PM
>> To: Oleksij Rempel <o.rempel@pengutronix.de>
>> Cc: Shawn Guo <shawnguo@kernel.org>; Fabio Estevam
>> <fabio.estevam@nxp.com>; Rob Herring <robh+dt@kernel.org>; Mark
>> Rutland <mark.rutland@arm.com>; A.s. Dong <aisheng.dong@nxp.com>;
>> Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>; Sudeep Holla
>> <sudeep.holla@arm.com>; Devicetree List <devicetree@vger.kernel.org>;
>> Linux Kernel Mailing List <linux-kernel@vger.kernel.org>; , Sascha Hauer
>> <kernel@pengutronix.de>; , linux-arm-kernel@lists.infradead.org, linux-
>> mediatek@lists.infradead.org, srv_heupstream <linux-arm-
>> kernel@lists.infradead.org>; dl-linux-imx <linux-imx@nxp.com>
>> 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@pengutronix.de>
>> wrote:
>> > From: Dong Aisheng <aisheng.dong@nxp.com>
>> >
>> > 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
>
You mean that is a good thing, right?