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

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Date:	Thu, 20 Aug 2015 16:06:29 +0800
From:	Viet Nga Dao <vndao@...era.com>
To:	Marek Vasut <marex@...x.de>
Cc:	Viet Nga Dao <vndao@...era.com>,
	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>
Subject: Re: [PATCH] [PATCH v4] mtd:spi-nor: Add Altera Quad SPI Driver

On Thu, Aug 20, 2015 at 3:55 PM, Marek Vasut <marex@...x.de> wrote:
> 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) ?
>

This is new soft IP.

>> > 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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