[PATCH 1/1 v1] cmd: gpio: Correct do_gpio() return value

[Luka Kovacic]

Use the correct return value in function do_gpio() and update
commands documentation with the return values from command_ret_t enum.

CMD_RET_SUCCESS is returned on command success and CMD_RET_FAILURE is
returned on command failure.

The command was returning the pin value, which caused confusion when
debugging (#define DEBUG).

Signed-off-by: Luka Kovacic <luka.kovacic at sartura.hr>
Tested-by: Robert Marko <robert.marko at sartura.hr>
---
 cmd/gpio.c          | 22 +++++++++++++++++-----
 doc/README.commands |  4 ++--
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/cmd/gpio.c b/cmd/gpio.c
index eff36ab2af..67eef83c95 100644
--- a/cmd/gpio.c
+++ b/cmd/gpio.c
@@ -223,23 +223,35 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		gpio_direction_output(gpio, value);
 	}
 	printf("gpio: pin %s (gpio %u) value is ", str_gpio, gpio);
-	if (IS_ERR_VALUE(value))
+
+	if (IS_ERR_VALUE(value)) {
 		printf("unknown (ret=%d)\n", value);
-	else
+		goto err;
+	} else {
 		printf("%d\n", value);
+	}
+
 	if (sub_cmd != GPIOC_INPUT && !IS_ERR_VALUE(value)) {
 		int nval = gpio_get_value(gpio);
 
-		if (IS_ERR_VALUE(nval))
+		if (IS_ERR_VALUE(nval)) {
 			printf("   Warning: no access to GPIO output value\n");
-		else if (nval != value)
+			goto err;
+		} else if (nval != value) {
 			printf("   Warning: value of pin is still %d\n", nval);
+			goto err;
+		}
 	}
 
 	if (ret != -EBUSY)
 		gpio_free(gpio);
 
-	return value;
+	return CMD_RET_SUCCESS;
+
+err:
+	if (ret != -EBUSY)
+		gpio_free(gpio);
+	return CMD_RET_FAILURE;
 }
 
 U_BOOT_CMD(gpio, 4, 0, do_gpio,
diff --git a/doc/README.commands b/doc/README.commands
index e03eb44187..4e9e8098fa 100644
--- a/doc/README.commands
+++ b/doc/README.commands
@@ -83,9 +83,9 @@ argv:		Arguments.
 
 Allowable return value are:
 
-CMD_SUCCESS	The command was successfully executed.
+CMD_RET_SUCCESS	The command was successfully executed.
 
-CMD_FAILURE	The command failed.
+CMD_RET_FAILURE	The command failed.
 
 CMD_RET_USAGE	The command was called with invalid parameters. This value
 		leads to the display of the usage string.
-- 
2.20.1