[U-Boot] nand_get_device() and nand_release_device()

[Timur Tabi]

Scott,

As you know, the P1022 has this weird LBC/DIU muxing problem.  I'd like to
add support for the 'nand' command while the DIU is active.  Looking at
the NAND code, I see functions nand_get_device() and
nand_release_device().  What is the idea behind these functions?  Would it
make sense to do something like this:


static int __board_start_nand(void)
{
	return 0;
}
int board_start_nand(void) __attribute__((weak, alias("__board_start_nand")));

static void __board_finish_nand(void)
{
}
void board_finish_nand(void) __attribute__((weak,
alias("__board_finish_nand")));


static int nand_get_device(struct nand_chip *chip, struct mtd_info *mtd,
int new_state)
{
	chip->state = new_state;

	return board_start_nand();
}

static void nand_release_device(struct mtd_info *mtd)
{
	struct nand_chip *chip = mtd->priv;

	board_finish_nand();

	/* De-select the NAND device */
	chip->select_chip(mtd, -1);
}

-- 
Timur Tabi
Linux kernel developer at Freescale