ram: k3-am654: add support for LPDDR4 and DDR3L DDRs

[oweals/u-boot.git] / drivers / led / led-uclass.c

diff --git a/drivers/led/led-uclass.c b/drivers/led/led-uclass.c
index 78ab76050d64953e19b9f767021689263689444d..2859475a6b8e99a93377d1182543a181aa94a455 100644 (file)
--- a/drivers/led/led-uclass.c
+++ b/drivers/led/led-uclass.c
@@ -1,14 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2015 Google, Inc
  * Written by Simon Glass <sjg@chromium.org>
- *
- * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <led.h>
+#include <dm/device-internal.h>
 #include <dm/root.h>
 #include <dm/uclass-internal.h>
 
@@ -64,6 +64,35 @@ int led_set_period(struct udevice *dev, int period_ms)
 }
 #endif
 
+int led_default_state(void)
+{
+       struct udevice *dev;
+       struct uclass *uc;
+       const char *default_state;
+       int ret;
+
+       ret = uclass_get(UCLASS_LED, &uc);
+       if (ret)
+               return ret;
+       for (uclass_find_first_device(UCLASS_LED, &dev);
+            dev;
+            uclass_find_next_device(&dev)) {
+               default_state = dev_read_string(dev, "default-state");
+               if (!default_state)
+                       continue;
+               ret = device_probe(dev);
+               if (ret)
+                       return ret;
+               if (!strncmp(default_state, "on", 2))
+                       led_set_state(dev, LEDST_ON);
+               else if (!strncmp(default_state, "off", 3))
+                       led_set_state(dev, LEDST_OFF);
+               /* default-state = "keep" : device is only probed */
+       }
+
+       return ret;
+}
+
 UCLASS_DRIVER(led) = {
        .id             = UCLASS_LED,
        .name           = "led",