-----Original Message-----
From: Jassi Brar [mailto:jassisinghbrar at 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
[off-list ref]; Rob Herring [off-list ref]; Mark
Rutland [off-list ref]; A.s. Dong [off-list ref];
Vladimir Zapolskiy [off-list ref]; Sudeep Holla
[off-list ref]; Devicetree List [off-list ref];
Linux Kernel Mailing List [off-list ref]; , Sascha Hauer
[off-list ref]; , linux-arm-kernel at lists.infradead.org, linux-
mediatek at lists.infradead.org, srv_heupstream <linux-arm-
kernel at lists.infradead.org>; dl-linux-imx [off-list ref]
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 [off-list ref]
wrote:

quoted

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

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

Regards
Dong Aisheng

-jassi