sysreset: Fix unsupported request return values

The description of the sysreset request method in <sysreset.h> says that
the return value should be -EPROTONOSUPPORT if the requested reset type
is not supported by this device.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/sysreset/poweroff_gpio.c

@@ -33,7 +33,7 @@ static int poweroff_gpio_request(struct udevice *dev, enum sysreset_t type)
 	int r;
 
 	if (type != SYSRESET_POWER_OFF)
-		return -ENOSYS;
+		return -EPROTONOSUPPORT;
 
 	debug("GPIO poweroff\n");
 

drivers/sysreset/sysreset_psci.c

@@ -25,7 +25,7 @@ static int psci_sysreset_request(struct udevice *dev, enum sysreset_t type)
 		psci_sys_poweroff();
 		break;
 	default:
-		return -ENOSYS;
+		return -EPROTONOSUPPORT;
 	}
 
 	return -EINPROGRESS;

drivers/sysreset/sysreset_sandbox.c

@@ -21,7 +21,7 @@ static int sandbox_warm_sysreset_request(struct udevice *dev,
 		state->last_sysreset = type;
 		break;
 	default:
-		return -ENOSYS;
+		return -EPROTONOSUPPORT;
 	}
 	if (!state->sysreset_allowed[type])
 		return -EACCES;
@@ -70,7 +70,7 @@ static int sandbox_sysreset_request(struct udevice *dev, enum sysreset_t type)
 			return -EACCES;
 		sandbox_exit();
 	default:
-		return -ENOSYS;
+		return -EPROTONOSUPPORT;
 	}
 	if (!state->sysreset_allowed[type])
 		return -EACCES;

drivers/sysreset/sysreset_watchdog.c

@@ -29,7 +29,7 @@ static int wdt_reboot_request(struct udevice *dev, enum sysreset_t type)
 			return ret;
 		break;
 	default:
-		return -ENOSYS;
+		return -EPROTONOSUPPORT;
 	}
 
 	return -EINPROGRESS;

drivers/sysreset/sysreset_x86.c

@@ -87,7 +87,7 @@ static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
 			return ret;
 		return -EINPROGRESS;
 	default:
-		return -ENOSYS;
+		return -EPROTONOSUPPORT;
 	}
 
 	outb(value, IO_PORT_RESET);