[PATCH v7 3/6] dt-bindings: mailbox: imx-mu: add generic MU channel support

-----Original Message-----
From: Jassi Brar [mailto:jassisinghbrar at gmail.com]
Sent: Thursday, July 26, 2018 8:27 PM
To: A.s. Dong <aisheng.dong@nxp.com>
Cc: Oleksij Rempel <o.rempel@pengutronix.de>; Shawn Guo
[off-list ref]; Fabio Estevam [off-list ref]; Rob
Herring [off-list ref]; Mark Rutland [off-list ref];
Vladimir Zapolskiy [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>; Devicetree List [off-list ref];
dl-linux-imx [off-list ref]
Subject: Re: [PATCH v7 3/6] dt-bindings: mailbox: imx-mu: add generic MU
channel support

[...]

quoted

And SCU firmware does use MU in above way specified by reference

manual.

quoted

Even from HW point of view, it's still one channel only mailbox.
That's why we change the mbox-cells to 0 accordingly to avoid
confusing the multi channels users supported in this driver.

As per Sasha's request, we're going to support both protocol (SCU and
generic M4) in one mailbox driver, that means we need deal with this two

case property.

quoted

If we use mbox-cells 1 case for SCU, then the using would be like:
mboxes = <&mailbox 0> which is mixed with the normal multi channel
users. And we also must state clearly in binding doc that for
mbox-cells
 1 case for SCU, the cell value must be 0 which is also confusing with
Multi channel users.

How do you suggest for such case?

Let me read the spec and try to see/shine the light :)

Great, many thanks!

Regards
Dong Aisheng

Cheers!