[PATCH v3 2/3] cmd: bind: Try to improve the (un)bind help

[Miquel Raynal]

While it may sound totally obvious for the regular U-Boot developer to
get the parameters of the bind/unbind commands from the output of 'dm
tree', it did not felt straightforward to me until I was explicitly
told to look there. And even when I knew the command, I did not make a
direct link between the arguments of this command and the columns
returned by 'dm tree'.

Several of us lost a lot of time because of that, I would like to kindly
help other users by slightly improving this textual line. Unfortunately,
because of how this string is used (like within the 'help' command) I
cannot detail much more, but at least the pointer is there.

While we add this message, we can also imply CMD_DM when we enable
CMD_BIND so the debug message does not lead to an unknown command. This
way the 'dm' command will likely be there unless explicitly disabled.

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
---
 cmd/Kconfig | 1 +
 cmd/bind.c  | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 6cc3bf6c2d0..668411fd87c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -996,6 +996,7 @@ config CMD_BCB
 config CMD_BIND
 	bool "bind/unbind - Bind or unbind a device to/from a driver"
 	depends on DM
+	imply CMD_DM
 	help
 	  Bind or unbind a device to/from a driver from the command line.
 	  This is useful in situations where a device may be handled by several
diff --git a/cmd/bind.c b/cmd/bind.c
index 4d1b7885e60..be0d4d2a711 100644
--- a/cmd/bind.c
+++ b/cmd/bind.c
@@ -246,6 +246,8 @@ U_BOOT_CMD(
 	"Bind a device to a driver",
 	"<node path> <driver>\n"
 	"bind <class> <index> <driver>\n"
+	"Use 'dm tree' to list all devices registered in the driver model,\n"
+	"their path, class, index and current driver.\n"
 );
 
 U_BOOT_CMD(
@@ -254,4 +256,6 @@ U_BOOT_CMD(
 	"<node path>\n"
 	"unbind <class> <index>\n"
 	"unbind <class> <index> <driver>\n"
+	"Use 'dm tree' to list all devices registered in the driver model,\n"
+	"their path, class, index and current driver.\n"
 );
-- 
2.34.1