[U-Boot] [PATCH v1] blackfin: Add comments for watchdog event initialization.

[Sonic Zhang]

From: Sonic Zhang <sonic.zhang at analog.com>

- Add comments for watchdog event initialization.
- Make sure the writting operation to MMRs are finished.

Signed-off-by: Sonic Zhang <sonic.zhang at analog.com>
---
 arch/blackfin/cpu/initcode.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c
index 5fc06e1..ffaf101 100644
--- a/arch/blackfin/cpu/initcode.c
+++ b/arch/blackfin/cpu/initcode.c
@@ -458,15 +458,23 @@ program_early_devices(ADI_BOOT_DATA *bs, uint *sdivB, uint *divB, uint *vcoB)
 	if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) {
 		serial_putc('e');
 #ifdef __ADSPBF60x__
+		/* Reset system event controller */
 		bfin_write_SEC_GCTL(0x2);
+		bfin_write_SEC_CCTL(0x2);
 		SSYNC();
+
+		/* Enable fault event input and system reset action in fault
+		 * controller. Route watchdog timeout event to fault interface.
+		 */
 		bfin_write_SEC_FCTL(0xc1);
+		/* Enable watchdog interrupt source */
 		bfin_write_SEC_SCTL(2, bfin_read_SEC_SCTL(2) | 0x6);
-
-		bfin_write_SEC_CCTL(0x2);
 		SSYNC();
+
+		/* Enable system event controller */
 		bfin_write_SEC_GCTL(0x1);
 		bfin_write_SEC_CCTL(0x1);
+		SSYNC();
 #endif
 		bfin_write_WDOG_CTL(WDDIS);
 		SSYNC();
-- 
1.7.0.4