linux-kernel - Re: [PATCH v8 1/4] mtd: spi-nor: introduce SPI 1-2-2 and SPI 1-4-4 protocols

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Message-ID: <681ffcab-6911-0d50-94a8-1dd94e87063b@gmail.com>
Date:   Tue, 25 Apr 2017 22:25:54 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-mtd@...ts.infradead.org
Cc:     computersforpeace@...il.com, dwmw2@...radead.org,
        boris.brezillon@...e-electrons.com, richard@....at,
        linux-kernel@...r.kernel.org,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: Re: [PATCH v8 1/4] mtd: spi-nor: introduce SPI 1-2-2 and SPI 1-4-4
 protocols

On 04/25/2017 10:08 PM, Cyrille Pitchen wrote:
> From: Cyrille Pitchen <cyrille.pitchen@...el.com>
> 
> 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.
> 
> Then, to improve the readability of spi_nor_scan(), the discovery of the
> memory settings and the memory initialization are now split into two
> dedicated functions.
> 
> 1 - spi_nor_init_params()
> 
> The spi_nor_init_params() function is responsible for initializing the
> 'struct spi_nor_flash_parameter'. Currently this structure is filled with
> legacy values but further patches will allow to override some parameter
> values dynamically, for instance by reading the JESD216 Serial Flash
> Discoverable Parameter (SFDP) tables from the SPI memory.
> The spi_nor_init_params() function only deals with the hardware
> capabilities of the SPI flash memory: especially it doesn't care about
> the hardware capabilities supported by the SPI controller.
> 
> 2 - spi_nor_setup()
> 
> The second function is called once the 'struct spi_nor_flash_parameter'
> has been initialized by spi_nor_init_params().
> With both 'struct spi_nor_flash_parameter' and 'struct spi_nor_hwcaps',
> the new argument of spi_nor_scan(), spi_nor_setup() computes the best
> match between hardware caps supported by both the (Q)SPI memory and
> controller hence selecting the relevant settings for (Fast) Read and Page
> Program operations.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>

Reviewed-by: Marek Vasut <marek.vasut@...il.com>

[...]

-- 
Best regards,
Marek Vasut