linux-kernel - Re: [PATCH v3 1/5] spi: introduce mmap read support for spi flash devices

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Date:	Tue, 17 Nov 2015 12:02:29 +0530
From:	Vignesh R <vigneshr@...com>
To:	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	Brian Norris <computersforpeace@...il.com>,
	Marek Vasut <marex@...x.de>
CC:	Michal Suchanek <hramrach@...il.com>,
	Russell King <linux@....linux.org.uk>,
	<devicetree@...r.kernel.org>, Tony Lindgren <tony@...mide.com>,
	<linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	<linux-mtd@...ts.infradead.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/5] spi: introduce mmap read support for spi flash
 devices

Hi Brian,

On 11/13/2015 09:35 PM, Cyrille Pitchen wrote:

[...]

> 
> In September I've sent a series of patches to enhance the support of QSPI flash
> memories. Patch 4 was dedicated to the m25p80 driver and set the
> rx_nbits / tx_nbits fields of spi_transfer struct(s) in order to configure the
> number of I/O lines independently for the opcode, address and data parts.
> The work was done for m25p80_read() but also for _read_reg(), _write_reg() and
> _write().
> The patched m25p80 driver was then tested with an at25 memory to check non-
> regression.
> 
> This series of patches also added 4 enum spi_protocol fields inside struct
> spi_nor so the spi-nor framework can tell the (Q)SPI controller driver what SPI
> protocol should be use for erase, read, write and register read/write
> operations, depending on the memory manufacturer and the command opcode.
> This was done to better support Micron, Spansion and Macronix QSPI memories.
> 
> I have tested the series with Micron QSPI memories and Atmel QSPI controller
> and I guess Marek also tested it on his side with Spansion QSPI memories and
> another QSPI controller.
> 
> So if it can help other developers to develop QSPI controller drivers, the
> series is still available there:
> 
> for the whole series:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2015-September/371170.html
> 
> for patch 4 (depends on patch 2 for enum spi_protocol):
> http://lists.infradead.org/pipermail/linux-arm-kernel/2015-September/371173.html
> 

Should I rebase my next version on top of above patches by Cyrille or
shall I post on top of 4.4-rc1?

-- 
Regards
Vignesh
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