linux-kernel - Re: [PATCH v3 10/21] mtd: support BB SRAM on ICP DAS LP-8x4x

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Date:	Wed, 16 Apr 2014 09:21:13 +0400
From:	Sergei Ianovich <ynvich@...il.com>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Kees Cook <keescook@...omium.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Philip Avinash <avinashphilip@...com>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH v3 10/21] mtd: support BB SRAM on ICP DAS LP-8x4x

On Tue, 2014-04-15 at 22:04 -0700, Brian Norris wrote:
> Hi Sergei,
> 
> On Tue, Dec 17, 2013 at 11:37:40PM +0400, Sergei Ianovich wrote:
> > This provides an MTD device driver for 512kB of battery backed up SRAM
> > on ICPDAS LP-8X4X programmable automation controllers.
> > 
> > SRAM chip is connected via FPGA and is not accessible without a driver,
> > unlike flash memory which is wired to CPU MMU.
> > 
> > This SRAM becomes an excellent persisent storage of volatile process
> > data like counter values and sensor statuses. Storing those data in
> > flash or mmc card is not a viable solution.
> > 
> > Signed-off-by: Sergei Ianovich <ynvich@...il.com>
> > ---
> >    v2..v3
> >    * no changes (except number 08/16 -> 10/21)
> > 
> >    v0..v2
> >    * use device tree
> >    * use devm helpers where possible
> 
> What's the status of this series? Is the rest of this platform support
> going in via other trees yet? I have a few trivial comments, but this
> driver mostly looks good as-is.

(...)

> You'll need a (trivial) DT binding doc in
> Documentation/devicetree/bindings/ to go with this. You might also need
> to split the arch/arm/boot/dts/ stuff out to a separate patch, so the
> MTD driver can go in the MTD tree separate from the ARM tree bits.

(...)

> With that, you have my:
> 
> 	Reviewed-by: Brian Norris <computersforpeace@...il.com>
> 
> and I can merge this to the MTD tree if/when you'd like.

Thanks for response, the rest of the series is stuck on a DMA driver
with no development activity. I'll fix the comments, separate ARM staff
and refile the patch.

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