linux-kernel - Re: [PATCH v5 5/6] Documentation: dt-bindings: Add binding info for X-Gene QMTM UIO driver

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Message-ID: <CAPTm99WYNyxtY-NCVN8pB0HwNPn+EFx-7w7yEevaEK1z7-Zqxg@mail.gmail.com>
Date:	Tue, 18 Nov 2014 14:59:54 +0530
From:	Ankit Jindal <ankit.jindal@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Varka Bhadram <varkabhadram@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Anup Patel <anup@...infault.org>,
	Guenter Roeck <linux@...ck-us.net>,
	"patches@....com" <patches@....com>,
	Rob Herring <robh+dt@...nel.org>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Tushar Jagad <tushar.jagad@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	Andreas Färber <afaerber@...e.de>
Subject: Re: [PATCH v5 5/6] Documentation: dt-bindings: Add binding info for
 X-Gene QMTM UIO driver

On 17 November 2014 16:47, Arnd Bergmann <arnd@...db.de> wrote:
> On Monday 17 November 2014 16:06:11 Ankit Jindal wrote:
>> +
>> +       qmtm1_uio: qmtm_uio@...00000 {
>> +               compatible = "apm,xgene-qmtm";
>> +               status = "disabled";
>> +               reg = <0x0 0x1f200000 0x0 0x10000>,
>> +                     <0x0 0x1b000000 0x0 0x400000>;
>> +               reg-names = "csr", "fabric";
>> +               qpool-memory = <&qmtm1_uio_qpool>;
>> +               clocks = <&qmtm1clk 0>;
>> +               num-queues = <0x400>;
>> +               devid = <1>;
>> +       };
>> +
>
> To make my previous review comments clearer:
>
> NAK
>
> Do not create device nodes that are meant for a specific use case in
> software and that are not usable for the common case. I don't think
> it makes any sense to keep on submitting a UIO driver for this until
> we have a proper network driver that uses this so we can make sure we
> have a working binding.

The dataplane frameworks like OpenDataPlane etc, need to have access
to complete subsystem from the user space. Hence, we would like to
have this driver and some other UIO drivers to be the part of kernel
to have data plane frameworks working on our platform.

>
>         Arnd

Thanks,
Ankit
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