[U-Boot] [PATCH] mtd: nand: mxs: Add support for multiple NAND chips

[Marek Vasut <marex@denx.de>]

On Tuesday, December 02, 2014 at 02:26:14 PM, Stefan Roese wrote:
> This patch adds support for multiple NAND chips connected to the
> i.MX6. Linux already supports this configuration. So lets port
> the missing features to the U-Boot driver to support more than
> one NAND chip here as well.
> 
> The necessary changes in detail are:
> 
> - Only use DMA channel 0 for all NAND chips:
>   Linux: a7c12d01 (mtd: gpmi: use DMA channel 0 for all the
>                    nand chips)
>          d159d8b7 (mtd: gpmi: decouple the chip select from
>                    the DMA channel)
> - On i.MX6 only use ready/busy pin for CS0:
>   Linux: 7caa4fd2 (mtd: gpmi: imx6: fix the wrong method for
>                    checking ready/busy)
> 
> To enable this feature the board needs to configure
> CONFIG_SYS_NAND_MAX_CHIPS to 2 (or more).
> 
> With these changes I'm able to detect and acces 2 NAND chips:
> 
> => nand device
> 
> Device 0: 2x nand0, sector size 128 KiB
>   Page size      2048 b
>   OOB size         64 b
>   Erase size   131072 b

Shouldn't you see "Device 0" and "Device 1" ?

> Please note that this is also needed to support a NAND chip with
> multiple chips embedded in one die, e.g. Micron MT29F32G08QAA.
> 
> Tested on a i.MX6DL based board with 2 Micron MT29F4G08AB
> chips.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Stefano Babic <sbabic@denx.de>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> Cc: Scott Wood <scottwood@freescale.com>

Looks pretty trivial, thanks!

Reviewed-by: Marek Vasut <marex@denx.de>

Best regards,
Marek Vasut