[U-Boot] [PATCH v7 10/12] cmd: mtdparts: try to probe the MTD devices as a fallback

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Thu,  6 Sep 2018 09:08:52 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Current implementation of mtdparts command errors out if the desired MTD
> device is not found. Fallback to the new probe function in this case
> before erroring out.
> 
> This will the save the user the need to call something like 'mtd list'
> before mtdparts.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Acked-by: Jagan Teki <jagan@openedev.com>
> Reviewed-by: Stefan Roese <sr@denx.de>
> ---
>  cmd/mtdparts.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/cmd/mtdparts.c b/cmd/mtdparts.c
> index f7ed1a0779..a1102c3fc5 100644
> --- a/cmd/mtdparts.c
> +++ b/cmd/mtdparts.c
> @@ -79,6 +79,10 @@
>  #include <linux/err.h>
>  #include <linux/mtd/mtd.h>
>  
> +#if defined(CONFIG_MTD)
> +#include <mtd.h>
> +#endif
> +
>  #if defined(CONFIG_CMD_NAND)
>  #include <linux/mtd/rawnand.h>
>  #include <nand.h>
> @@ -307,9 +311,15 @@ static int get_mtd_info(u8 type, u8 num, struct mtd_info **mtd)
>  
>  	sprintf(mtd_dev, "%s%d", MTD_DEV_TYPE(type), num);
>  	*mtd = get_mtd_device_nm(mtd_dev);
> -	if (IS_ERR(*mtd)) {
> -		printf("Device %s not found!\n", mtd_dev);
> -		return 1;
> +	if (IS_ERR_OR_NULL(*mtd)) {
> +#ifdef CONFIG_MTD

In its current state, it should #ifdef CONFIG_CMD_MTD, since
mtd_probe_devices() is implemented in cmd/mtd.c. Anyway, as I
suggested, I think it's better to just move that in mtd_uboot.c and
drop the #ifdef.

> +		mtd_probe_devices();
> +		*mtd = get_mtd_device_nm(mtd_dev);
> +#endif

BTW, I'm not sure why we need to call mtd_probe_devices() here. If we
really want to deprecate this command, then I'd recommend not adding new
features to it.

> +		if (IS_ERR_OR_NULL(*mtd)) {
> +			printf("Device %s not found!\n", mtd_dev);
> +			return 1;
> +		}
>  	}
>  	put_mtd_device(*mtd);
>