linux-kernel - Re: [PATCH] [PATCH v4] mtd:spi-nor: Add Altera Quad SPI Driver

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Date:	Thu, 20 Aug 2015 09:55:19 +0200
From:	Marek Vasut <marex@...x.de>
To:	Viet Nga Dao <vndao@...era.com>
Cc:	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nga_chi86" <ngachi86@...il.com>
Subject: Re: [PATCH] [PATCH v4] mtd:spi-nor: Add Altera Quad SPI Driver

On Thursday, August 20, 2015 at 09:37:33 AM, Viet Nga Dao wrote:
> Hi,

Hi,

> >> On Tuesday, August 18, 2015 at 03:24:44 AM, Brian Norris wrote:
> >>> I'm not very helpful here, so hopefully Viet can be of more use:
> >> Yup :)
> >> 
> >>> On Mon, Aug 17, 2015 at 07:53:23PM +0200, Marek Vasut wrote:
> >>> > On Monday, August 17, 2015 at 06:03:38 PM, Brian Norris wrote:
> >>> > Also, I cannot find any documentation for this IP block even if I
> >>> > search through Quartus/QSys, is there any proper documentation
> >>> > available anywhere?
> >>> 
> >>> I never found proper documentation, but I didn't look too hard. I've
> >>> mostly been going off of Viet's comments and code.
> >> 
> >> Me neither, and I looked through the altera stuff in fact. I'm trying to
> >> learn whether this is just an Soft IP, in which case it certainly can
> >> be fixed ; or if there is actually some chip shipping with this crap
> >> synthesised into actual silicon.
> >> 
> >>> But FWIW, I did find some relevant info for the peculiar Altera EPCQ
> >>> flash here:
> >>> 
> >>> https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/litera
> >>> ture/
> >>> hb/cfg/cfg_cf52012.pdf
> >> 
> >> Altera EPCS/EPCQ flashes are just rebranded micron flashes, they just
> >> have different JEDEC >ID and are a bit more expensive.
> > 
> > You can find the document at here
> > (https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literatu
> > re/ug/ug_embedded_ip.pdf)
> > 
> >  Chapter 42.Page 407.
> > 
> > For the soft IP issue, i've requested hardware engineer to come out
> > the solution.

That's good :)

> > So in the mean way, our driver will NOT support Micron
> > flashes until hardware fix is completed.

This doesn't answer my question, so let me reiterate. Is this controller
only Soft IP (as in, FPGA core) or is this controller shipping in some
chip as Hard IP (as in, piece of silicon) ?

> > Hence, i just submitted version 5 for this driver with eliminating
> > micron device support. Hope this version will get ACKed by you.

We'll see.

Best regards,
Marek Vasut
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