linux-kernel - Re: [PATCH v4 2/2] misc: xlnx_vcu: Add Xilinx ZYNQMP VCU logicoreIP init driver

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Date:   Mon, 18 Dec 2017 14:13:26 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Arnd Bergmann <arnd@...db.de>, Dhaval Shah <dhaval.shah@...inx.com>
CC:     gregkh <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Hyun Kwon <hyunk@...inx.com>, Dhaval Shah <dshah@...inx.com>
Subject: Re: [PATCH v4 2/2] misc: xlnx_vcu: Add Xilinx ZYNQMP VCU logicoreIP
 init driver

On 15.12.2017 14:26, Arnd Bergmann wrote:
> In Fri, Dec 15, 2017 at 8:24 AM, Dhaval Shah <dhaval.shah@...inx.com> wrote:
>> Xilinx ZYNQMP logicoreIP Init driver is based on the new
>> LogiCoreIP design created. This driver provides the processing system
>> and programmable logic isolation. Set the frequency based on the clock
>> information get from the logicoreIP register set.
>>
>> It is put in drivers/misc as there is no subsystem for this logicoreIP.
>>
>> Signed-off-by: Dhaval Shah <dshah@...inx.com>
> 
> After giving this some more thought, I'd suggest you move the driver to
> drivers/soc/xilinx or drivers/soc/zynq instead of drivers/misc/, and have
> it merged by Michal Simek as a driver patch that will go through arm-soc.

I have not a problem of creating drivers/soc/xilinx/ location for this
driver. It is not zynq (arm32) but zynqmp(arm64) device where this
driver can be used. As far as I understand it is memory mapped soft IP
which could be also accessed by soft core CPU.
It means drivers/soc/xilinx could be shared by all xilinx platforms anyway.
We have been discussing that openrisc cases and for sure if someone
wants to enable this driver there using misc location would be one
option but I also think that using drivers/soc/xilinx location is not a
bad option because it is very unlikely that anybody tries it.

Arnd: misc or drivers/soc/xilinx?

Thanks,
Michal