dm: timer: uclass: add timer init in uclass driver to add timer device

Adding timer init function in timer-uclass driver to create and
initialize the timer device on platforms where u-boot,dm-pre-reloc
is not used. Since there will be multiple timer devices in the
system, adding a tick-timer node in chosen node to know which
timer device to be used as tick timer in u-boot.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
index aca421b..0480178 100644
--- a/drivers/timer/timer-uclass.c
+++ b/drivers/timer/timer-uclass.c
@@ -6,6 +6,8 @@
 
 #include <common.h>
 #include <dm.h>
+#include <dm/lists.h>
+#include <dm/device-internal.h>
 #include <errno.h>
 #include <timer.h>
 
@@ -56,6 +58,48 @@ u64 timer_conv_64(u32 count)
 	return ((u64)gd->timebase_h << 32) | gd->timebase_l;
 }
 
+int notrace dm_timer_init(void)
+{
+	const void *blob = gd->fdt_blob;
+	struct udevice *dev = NULL;
+	int node;
+	int ret;
+
+	if (gd->timer)
+		return 0;
+
+	/* Check for a chosen timer to be used for tick */
+	node = fdtdec_get_chosen_node(blob, "tick-timer");
+	if (node < 0) {
+		/* No chosen timer, trying first available timer */
+		ret = uclass_first_device(UCLASS_TIMER, &dev);
+		if (ret)
+			return ret;
+		if (!dev)
+			return -ENODEV;
+	} else {
+		if (uclass_get_device_by_of_offset(UCLASS_TIMER, node, &dev)) {
+			/*
+			 * If the timer is not marked to be bound before
+			 * relocation, bind it anyway.
+			 */
+			if (node > 0 &&
+			    !lists_bind_fdt(gd->dm_root, blob, node, &dev)) {
+				ret = device_probe(dev);
+				if (ret)
+					return ret;
+			}
+		}
+	}
+
+	if (dev) {
+		gd->timer = dev;
+		return 0;
+	}
+
+	return -ENODEV;
+}
+
 UCLASS_DRIVER(timer) = {
 	.id		= UCLASS_TIMER,
 	.name		= "timer",