dm: Add support for LEDs
Add a simple uclass for LEDs, so that these can be controlled by the device
tree and activated when needed. LEDs are referred to by their label.
This implementation requires a driver for each type of LED (e.g GPIO, I2C).
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 24baa5c..a961648 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -33,6 +33,7 @@
UCLASS_I2C, /* I2C bus */
UCLASS_I2C_EEPROM, /* I2C EEPROM device */
UCLASS_I2C_GENERIC, /* Generic I2C device */
+ UCLASS_LED, /* Light-emitting diode (LED) */
UCLASS_LPC, /* x86 'low pin count' interface */
UCLASS_MASS_STORAGE, /* Mass storage device */
UCLASS_MOD_EXP, /* RSA Mod Exp device */
diff --git a/include/led.h b/include/led.h
new file mode 100644
index 0000000..8925d75
--- /dev/null
+++ b/include/led.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __LED_H
+#define __LED_H
+
+/**
+ * struct led_uclass_plat - Platform data the uclass stores about each device
+ *
+ * @label: LED label
+ */
+struct led_uclass_plat {
+ const char *label;
+};
+
+struct led_ops {
+ /**
+ * set_on() - set the state of an LED
+ *
+ * @dev: LED device to change
+ * @on: 1 to turn the LED on, 0 to turn it off
+ * @return 0 if OK, -ve on error
+ */
+ int (*set_on)(struct udevice *dev, int on);
+};
+
+#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
+
+/**
+ * led_get_by_label() - Find an LED device by label
+ *
+ * @label: LED label to look up
+ * @devp: Returns the associated device, if found
+ * @return 0 if found, -ve on error
+ */
+int led_get_by_label(const char *label, struct udevice **devp);
+
+/**
+ * led_set_on() - set the state of an LED
+ *
+ * @dev: LED device to change
+ * @on: 1 to turn the LED on, 0 to turn it off
+ * @return 0 if OK, -ve on error
+ */
+int led_set_on(struct udevice *dev, int on);
+
+#endif