[PATCH v3 3/3] cmd: rng: Add rng list command

[Matthias Brugger]

On Wed, Jan 31, 2024 at 02:14:26PM +0000, Weizhao Ouyang wrote:
> The 'rng list' command probes all RNG devices and list those devices
> that are successfully probed. Also update the help info.
> 
> Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> Signed-off-by: Weizhao Ouyang <o451686892 at gmail.com>

Reviewed-by: Matthias Brugger <mbrugger at suse.com>

> ---
>  cmd/rng.c | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/cmd/rng.c b/cmd/rng.c
> index 52f722c7af..b073a6c849 100644
> --- a/cmd/rng.c
> +++ b/cmd/rng.c
> @@ -19,6 +19,22 @@ static int do_rng(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
>  	struct udevice *dev;
>  	int ret = CMD_RET_SUCCESS;
>  
> +	if (argc == 2 && !strcmp(argv[1], "list")) {
> +		int idx = 0;
> +
> +		uclass_foreach_dev_probe(UCLASS_RNG, dev) {
> +			idx++;
> +			printf("RNG #%d - %s\n", dev->seq_, dev->name);
> +		}
> +
> +		if (!idx) {
> +			log_err("No RNG device\n");
> +			return CMD_RET_FAILURE;
> +		}
> +
> +		return CMD_RET_SUCCESS;
> +	}
> +
>  	switch (argc) {
>  	case 1:
>  		devnum = 0;
> @@ -56,12 +72,9 @@ static int do_rng(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
>  	return ret;
>  }
>  
> -U_BOOT_LONGHELP(rng,
> -	"[dev [n]]\n"
> -	"  - print n random bytes(max 64) read from dev\n");
> -
>  U_BOOT_CMD(
>  	rng, 3, 0, do_rng,
>  	"print bytes from the hardware random number generator",
> -	rng_help_text
> +	"list         - list all the probed rng devices\n"
> +	"rng [dev] [n]    - print n random bytes(max 64) read from dev\n"
>  );
> -- 
> 2.39.2