linux-kernel - Re: [PATCH v5 1/6] mtd: spi-nor: introduce more SPI protocols and the Dual Transfer Mode

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Message-ID: <321615f2-4779-40ef-a647-ad78daa79ac3@wedev4u.fr>
Date:   Sun, 2 Apr 2017 19:05:25 +0200
From:   Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
To:     Cyrille Pitchen <cyrille.pitchen@...el.com>, marek.vasut@...il.com,
        linux-mtd@...ts.infradead.org, jartur@...ence.com,
        kdasu.kdev@...il.com, mar.krzeminski@...il.com
Cc:     boris.brezillon@...e-electrons.com, richard@....at,
        nicolas.ferre@...rochip.com, linux-kernel@...r.kernel.org,
        computersforpeace@...il.com, dwmw2@...radead.org
Subject: Re: [PATCH v5 1/6] mtd: spi-nor: introduce more SPI protocols and the
 Dual Transfer Mode

Le 23/03/2017 à 00:33, Cyrille Pitchen a écrit :
> This patch changes the prototype of spi_nor_scan(): its 3rd parameter
> is replaced by a 'struct spi_nor_hwcaps' pointer, which tells the spi-nor
> framework about the actual hardware capabilities supported by the SPI
> controller and its driver.
> 
> Besides, this patch also introduces a new 'struct spi_nor_flash_parameter'
> telling the spi-nor framework about the hardware capabilities supported by
> the SPI flash memory and the associated settings required to use those
> hardware caps.
> 
> Currently the 'struct spi_nor_flash_parameter' is filled with legacy
> values but a later patch will allow to fill it dynamically by reading the
> JESD216 Serial Flash Discoverable Parameter (SFDP) tables from the SPI
> memory.
> 
> With both structures, the spi-nor framework can now compute the best
> match between hardware caps supported by both the (Q)SPI memory and
> controller hence selecting the relevant SPI protocols and op codes for
> (Fast) Read, Page Program and Sector Erase operations.
> 
> The 'struct spi_nor_flash_parameter' also provides the spi-nor framework
> with the number of dummy cycles to be used with each Fast Read commands
> and the erase block size associated to the erase block op codes.
> 
> Finally the 'struct spi_nor_flash_parameter', through the optional
> .enable_quad_io() hook, tells the spi-nor framework how to set the Quad
> Enable (QE) bit of the QSPI memory to enable its Quad SPI features.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>

Applied to github/spi-nor.