On Monday, February 24, 2014 at 11:37:34 AM, Huang Shijie wrote:
> 1.) Why add a new framework for SPI NOR?
> The SPI-NOR controller such as Freescale's Quadspi controller is working
> in a different way from the SPI bus. It should knows the NOR commands to
> find the right LUT sequence. Unfortunately, the current code can not meet
> this requirement.
>
> 2.) How does this patch set do?
> This patch set adds a new spi-nor layer.
> Before this patch, the layer is like:
>
> MTD
> ------------------------
> m25p80
> ------------------------
> spi bus driver
> ------------------------
> SPI NOR chip
>
> After this patch, the layer is like:
> MTD
> ------------------------
> spi-nor
> ------------------------
> m25p80
> ------------------------
> spi bus driver
> ------------------------
> SPI NOR chip
>
> With the spi-nor controller driver(Freescale Quadspi), it looks like:
> MTD
> ------------------------
> spi-nor
> ------------------------
> fsl-quadspi
> ------------------------
> SPI NOR chip
>
> 3.) more details
> This patch set adds a new data structrue spi_nor{}, clones most the
> common code to spi-nor.c. Add spi_nor_xfer_cfg {} for the fundamental
> primitives: read_xfer/write_xfer.
>
> Make the m25p80.c/fsl_quaspi.c use the new APIs.
>
> 4.) Change log:
> v4 --> v5:
> [1] rebase the patch set on the l2-mtd tree.
> [2] fixed bugs in the fsl-quadspi driver.
> [3] tested the fsl-quadspi with imx6sx board.
It's starting to take a really nice shape, I really like it :)
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