linux-kernel - RE: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support in Zynq MPSoC GQSPI controller

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Date:	Fri, 17 Jul 2015 12:03:48 +0000
From:	Ranjit Abhimanyu Waghmode <ranjit.waghmode@...inx.com>
To:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>
CC:	Mark Brown <broonie@...nel.org>, Michal Simek <michals@...inx.com>,
	"Soren Brinkmann" <sorenb@...inx.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>,
	"zajec5@...il.com" <zajec5@...il.com>,
	"marex@...x.de" <marex@...x.de>,
	"shijie.huang@...el.com" <shijie.huang@...el.com>,
	"juhosg@...nwrt.org" <juhosg@...nwrt.org>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Harini Katakam <harinik@...inx.com>,
	"Punnaiah Choudary Kalluri" <punnaia@...inx.com>,
	"ran27jit@...il.com" <ran27jit@...il.com>
Subject: RE: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support
 in Zynq MPSoC GQSPI controller

Hi,

> -----Original Message-----
> From: Mark Brown [mailto:broonie@...nel.org]
> Sent: Thursday, July 16, 2015 2:28 PM
> To: Ranjit Abhimanyu Waghmode
> Cc: Michal Simek; Soren Brinkmann; dwmw2@...radead.org;
> computersforpeace@...il.com; zajec5@...il.com; marex@...x.de;
> shijie.huang@...el.com; juhosg@...nwrt.org; ben@...adent.org.uk; linux-
> mtd@...ts.infradead.org; linux-spi@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Harini Katakam;
> Punnaiah Choudary Kalluri; ran27jit@...il.com
> Subject: Re: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support in
> Zynq MPSoC GQSPI controller
>
> On Thu, Jul 16, 2015 at 07:27:34AM +0000, Ranjit Abhimanyu Waghmode wrote:
>
> > For an example take two flashes connected in stacked mode.
> > For user it doesn't matter whether how many flashes are really connected.
> > There will be situation like, single partition is spread across two flashes
> (partition staring at the end of one flash and continued to the second flash). But
> it has to be shown contiguous to user.
> > In this scenario, I am not clear how MTD layer will handle the case.
> > It would be great if you could just put some light on it.
>
> That's something for the MTD layer or possibly even a layer above it to worry
> about - this situation is the same as we have with disks where we have md which
> combines other devices, if something similar is needed for flash we should use a
> similar pattern.

Kindly help in understanding, how can we represent the stacked mode and parallel mode changes in MTD layer?

Thanks & Regards,
Ranjit


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