cmd: part: Add 'block' sub-command

From: Razvan Becheriu <razvan.becheriu at gmail.com>

    Add part block sub-command which returns block size.

    e.g.:
     part block mmc $mmcdev system_a system_a_index

Signed-off-by: Razvan Becheriu <razvan.becheriu at gmail.com>
---
 cmd/part.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

On Mon, Jun 01, 2020 at 01:20:26PM +0300, razvan.becheriu at gmail.com wrote:
> From: Razvan Becheriu <razvan.becheriu at gmail.com>
> 
>     Add part block sub-command which returns block size.
> 
>     e.g.:
>      part block mmc $mmcdev system_a system_a_index
> 
> Signed-off-by: Razvan Becheriu <razvan.becheriu at gmail.com>
> ---
>  cmd/part.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/cmd/part.c b/cmd/part.c
> index 5e4e45ca6d..d78d914e7a 100644
> --- a/cmd/part.c
> +++ b/cmd/part.c
> @@ -25,6 +25,7 @@
>  enum cmd_part_info {
>  	CMD_PART_INFO_START = 0,
>  	CMD_PART_INFO_SIZE,
> +	CMD_PART_INFO_BLOCK,
>  	CMD_PART_INFO_NUMBER
>  };
>  
> @@ -151,6 +152,9 @@ static int do_part_info(int argc, char * const argv[], enum cmd_part_info param)
>  	case CMD_PART_INFO_SIZE:
>  		snprintf(buf, sizeof(buf), LBAF, info.size);
>  		break;
> +	case CMD_PART_INFO_BLOCK:
> +		snprintf(buf, sizeof(buf), LBAF, info.blksz);
> +		break;
>  	case CMD_PART_INFO_NUMBER:
>  		snprintf(buf, sizeof(buf), "0x%x", part);
>  		break;
> @@ -177,6 +181,11 @@ static int do_part_size(int argc, char * const argv[])
>  	return do_part_info(argc, argv, CMD_PART_INFO_SIZE);
>  }
>  
> +static int do_part_block(int argc, char * const argv[])
> +{
> +	return do_part_info(argc, argv, CMD_PART_INFO_BLOCK);
> +}
> +
>  static int do_part_number(int argc, char * const argv[])
>  {
>  	return do_part_info(argc, argv, CMD_PART_INFO_NUMBER);
> @@ -195,6 +204,8 @@ static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  		return do_part_start(argc - 2, argv + 2);
>  	else if (!strcmp(argv[1], "size"))
>  		return do_part_size(argc - 2, argv + 2);
> +	else if (!strcmp(argv[1], "block"))
> +		return do_part_block(argc - 2, argv + 2);
>  	else if (!strcmp(argv[1], "number"))
>  		return do_part_number(argc - 2, argv + 2);
>  
> @@ -219,6 +230,9 @@ U_BOOT_CMD(
>  	"part size <interface> <dev> <part> <varname>\n"
>  	"    - set environment variable to the size of the partition (in blocks)\n"
>  	"      part can be either partition number or partition name\n"
> +	"part block <interface> <dev> <part> <varname>\n"
> +	"    - set environment variable to the size of the partition block\n"
> +	"      part can be either partition number or partition name\n"
>  	"part number <interface> <dev> <part> <varname>\n"
>  	"    - set environment variable to the partition number using the partition name\n"
>  	"      part must be specified as partition name"

I believe you can solve the problems mentioned in the cover letter with
setexpr to do the conversion so nak on this patch, thanks.