Re: [PATCH v2 00/12] Port the FSL QSPI driver to the SPI framework

[Boris Brezillon <boris.brezillon@xxxxxxxxxxx>]

Hi Frieder, Yogesh,

On Thu,  5 Jul 2018 13:14:56 +0200
Frieder Schrempf <frieder.schrempf@xxxxxxxxx> wrote:

> Now that the SPI memory interface was introduced by Boris [1], it is
> possible to move drivers from mtd/spi-nor to the SPI framework in order
> to use them for different type of SPI memory chips.
> 
> Patch 1 adds a function spi_mem_get_name() to the SPI memory interface
> and a ->name field to struct spi_mem.
> Patch 2 uses it in m25p80.c to make it possible for SPI controller
> drivers to provide a custom naming scheme for the flash chip.
> This is needed to avoid breaking compatibility of mtdparts when switching
> from the old to the new driver.
> 
> Patch 3 adds a driver for the Freescale QSPI controller to the SPI
> framework. Together with m25p80.c it can be used to interface SPI
> NOR flashes just as the old driver did. For this to work properly a few
> minor changes to the devicetrees are necessary (see patches 5 to 7).
> 
> Patch 8 changes the defconfigs to use the new driver and patch 9 removes
> the old driver.
> 
> Patch 10 and 11 remove 'fsl,qspi-has-second-chip' from the devicetrees.
> Patch 12 adjusts the MAINTAINERS file.
> 
> The new driver was tested with i.MX6UL and a Micron SPI NOR @ 60MHz.
> The read performance of the new driver is almost the same or even better
> than the old driver, depending on the block size.
> The write performance is a bit slower on average (~10-15%).
> 
> The new driver was also tested with the SPI NAND framework [2] and a
> Winbond W25M02GV flash.
> 
> If someone has a board that uses both chips selects and/or both busses,
> it would be really nice to have the driver be tested on such a setup.

Any progress on this front? Yogesh, can you please remind us the
remaining issues? I'd really like to make some progress, otherwise the
conversion to spi-mem will take ages.

Regards,

Boris

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