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

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Date:	Tue, 18 Nov 2014 14:10:35 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Ankit Jindal <ankit.jindal@...aro.org>
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 Tuesday 18 November 2014 14:59:54 Ankit Jindal wrote:
> 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.

Please work with the people that do the in-kernel QMTM driver to come
up with a common binding then.

	Arnd
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