linux-kernel - RE: [EXT] Re: [PATCH v3] mailbox: imx: add support for imx v1 mu

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Date:   Fri, 2 Aug 2019 03:24:16 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Daniel Baluta <daniel.baluta@...il.com>
CC:     "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Aisheng Dong <aisheng.dong@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [EXT] Re: [PATCH v3] mailbox: imx: add support for imx v1 mu

> -----Original Message-----
> From: Daniel Baluta <daniel.baluta@...il.com>
> Sent: 2019年8月1日 22:47
> To: Richard Zhu <hongxing.zhu@....com>
> Cc: jassisinghbrar@...il.com; Oleksij Rempel <o.rempel@...gutronix.de>;
> Aisheng Dong <aisheng.dong@....com>; Linux Kernel Mailing List
> <linux-kernel@...r.kernel.org>; linux-arm-kernel
> <linux-arm-kernel@...ts.infradead.org>; dl-linux-imx <linux-imx@....com>
> Subject: [EXT] Re: [PATCH v3] mailbox: imx: add support for imx v1 mu
> 
> Hi Richard,
> 
> Thanks for the patch. Please always add linux-imx@....com mailing list for imx
> related patches. I missed it.
> 
[Richard Zhu] Okay, roger that.

> Few comments inline.
> 
> Please also update in a separate patch attached to this series the devictree
> bindings doc Documentation/devicetree/bindings/mailbox/fsl,mu.txt
> by adding description for mx7ulp-mu
> 
> <snip>
[Richard Zhu] Okay, the binding doc would be added later.
> 
> > There is a version1.0 MU on i.MX7ULP platform.
> 
> space between version and 1.0
> 
[Richard Zhu] Okay.

> > One new version ID register is added, and it's offset is 0.
> > TRn registers are defined at the offset 0x20 ~ 0x2C.
> > RRn registers are defined at the offset 0x40 ~ 0x4C.
> > SR/CR registers are defined at 0x60/0x64.
> > Extend this driver to support it.
> 
> Do you have a little bit of history about MU versioning? So there was:
> 
> * version 0.5 on i.MX6-es
> * version 1.0 on i.MX7ULP
> 
> Next, is this 1.0 compatbile with i.MX8 right?
> 
[Richard Zhu] Only i.MX7ULP has the version 1.0 MU.
i.MX8 has the same version MU that i.MX6-es have.
IMHO, I don't know why design team do it this way.

> Also, can you please rebase your patch on my 2 bugfixes attached?
[Richard Zhu] Okay, no problem. I would send the v4 version out later after rebase your 2 bugfixes patches.
> 
> thanks,
> Daniel.