[U-Boot] mtd: nand: am335x_spl_bch: Incorporate tWB delay in nand_command function

[Tom Rini]

On Thu, Apr 06, 2017 at 03:54:14PM -0500, Cooper Jr., Franklin wrote:

> Various commands to NAND flash results in the NAND flash becoming busy.
> For those commands the SoC should wait until the NAND indicates it is
> no longer busy before sending further commands. However, there is a delay
> between the time the SoC sends its last command and when the NAND flash
> sets its Ready/Busy Pin. This delay (tWB) must be respected or the SoC may
> falsely assume the flash is ready when in reality it just hasn't had enough
> time to indicate that it is busy.
> 
> Properly delaying by tWB is already done for nand_command/nand_command_lp
> in nand_base.c including the version of it in the Linux kernel. Therefore,
> this patch brings the handling of tWB delay inline to nand_base.c
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper at ti.com>

A slight reformat to the comments and applied to u-boot/master, thanks!

-- 
Tom
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