[PATCH 1/2] timer: tegra: Bind watchdog driver when timer node is processed

[Lukasz Majewski]

The Tegra30 SoC is a bit special, as it doesn't have the separate IP block
to provide watchdog functionality.

Instead, timer IP block allows such functionality when properly configured.

As in the tegra30.dtsi there is a timer node, which "covers" all timers,
with 'nvidia,tegra30-timer' compatibility it was necessary to manually
bind U-Boot's WDT driver (based on WDT_UCLASS).

Signed-off-by: Lukasz Majewski <lukma at nabladev.com>
---
 drivers/timer/tegra-timer.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/timer/tegra-timer.c b/drivers/timer/tegra-timer.c
index 3545424889d..361539efa43 100644
--- a/drivers/timer/tegra-timer.c
+++ b/drivers/timer/tegra-timer.c
@@ -11,6 +11,8 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/tegra.h>
 
+#include <dm/lists.h>
+
 #define TEGRA_OSC_CLK_ENB_L_SET		(NV_PA_CLK_RST_BASE + 0x320)
 #define TEGRA_OSC_SET_CLK_ENB_TMR	BIT(5)
 
@@ -106,6 +108,21 @@ static int tegra_timer_probe(struct udevice *dev)
 	return 0;
 }
 
+static int tegra_timer_bind(struct udevice *dev)
+{
+	/*
+	 * In Tegra 30 SoC the Watchdog is accomplished
+	 * by the timer IP block (timer5).
+	 */
+	if (CONFIG_IS_ENABLED(WDT_TEGRA))
+		return device_bind_driver_to_node(dev, "tegra_wdt",
+						  "tegra-wdt",
+						  dev_ofnode(dev),
+						  NULL);
+
+	return 0;
+}
+
 static const struct timer_ops tegra_timer_ops = {
 	.get_count = tegra_timer_get_count,
 };
@@ -124,6 +141,7 @@ U_BOOT_DRIVER(tegra_timer) = {
 	.id		= UCLASS_TIMER,
 	.of_match	= tegra_timer_ids,
 	.probe		= tegra_timer_probe,
+	.bind		= tegra_timer_bind,
 	.ops		= &tegra_timer_ops,
 	.flags		= DM_FLAG_PRE_RELOC,
 };
-- 
2.39.5