linux-kernel - Re: [PATCH] [linux][master][v1] misc: Add Xilinx ZYNQMP VCU logicoreIP init driver

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Date:   Tue, 5 Dec 2017 14:32:22 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Dhaval Rajeshbhai Shah <DSHAH@...inx.com>
Cc:     gregkh <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Hyun Kwon <hyunk@...inx.com>
Subject: Re: [PATCH] [linux][master][v1] misc: Add Xilinx ZYNQMP VCU
 logicoreIP init driver

On Tue, Dec 5, 2017 at 1:38 PM, Dhaval Rajeshbhai Shah <DSHAH@...inx.com> wrote:
> From: arndbergmann@...il.com [mailto:arndbergmann@...il.com] On Behalf Of Arnd Bergmann
> Sent: Tuesday, December 05, 2017 4:19 AM
> To: Dhaval Rajeshbhai Shah <DSHAH@...inx.com>
> Cc: gregkh <gregkh@...uxfoundation.org>; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; Michal Simek <michal.simek@...inx.com>; Hyun Kwon <hyunk@...inx.com>; Dhaval Rajeshbhai Shah <DSHAH@...inx.com>
> Subject: Re: [PATCH] [linux][master][v1] misc: Add Xilinx ZYNQMP VCU logicoreIP init driver
>
> On Tue, Dec 5, 2017 at 12:43 PM, Dhaval Shah <dhaval.shah@...inx.com> wrote:
>> Xilinx ZYNQMP VCU Init driver is based on the new LogiCoreIP design
>> created. This driver will provide the api which can be used by the
>> encoder and decoder driver to get the configured value.
>>
>> Signed-off-by: Dhaval Shah <dshah@...inx.com>
>
> Can you explain what a "VCU" is and why there is no existing subsystem for it?
>
> [Dhaval] : This VCU means Video codec unit. Here, this driver is for the logicoreIP and not the VCU which is created to support the PS and PL isolation and to provide the clock related information. So this is not a VCU driver and but just a intermediate driver which supports logicoreIP. That's why no subsystem for this.

What are PS and PL then?

> If this is the "video codec unit", I'd suggest moving it to drivers/media/platform and sending the patch to the linux-media@...r.kernel.org list instead.
> [Dhaval] : This is not the Video codec unit but the driver to provide the support the IP created for the PS and PL isolation and clock related information. That why I have placed this under the "drivers/misc/".

Is the driver useful without a codec driver then? (I assume this will
be answered when
you explain PS and PL). If not, just put it in the same directory as the codec.

       Arnd