[PATCH 1/1] cmd/button: return button status

[Philippe REYNES <philippe.reynes@softathome.com>]

> To make the button command useful in a shell script it should return the
> status of the button:
> 
> * 0 (true) - pressed, on
> * 1 (false) - not pressed, off
> 
> The button command takes only one argument. Correct maxargs.
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Reviewed-by: Philippe Reynes <philippe.reynes@softathome.com>

> ---
> cmd/button.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/cmd/button.c b/cmd/button.c
> index 84ad1653c7..64c5a8fa04 100644
> --- a/cmd/button.c
> +++ b/cmd/button.c
> @@ -75,11 +75,11 @@ int do_button(struct cmd_tbl *cmdtp, int flag, int argc,
> char *const argv[])
> 
> ret = show_button_state(dev);
> 
> - return 0;
> + return !ret;
> }
> 
> U_BOOT_CMD(
> - button, 4, 1, do_button,
> + button, 2, 1, do_button,
> "manage buttons",
> "<button_label> \tGet button state\n"
> "button list\t\tShow a list of buttons"
> --
> 2.28.0