ARM: k2g: Configure reset mux to device reset

BOOTCFG_RSTMUX8 register controls the reset mux associated with the ARM.
Timer5(dedicated to ARM) when used as WatchDog timer, the events it
generates are routed to the above mux.

Following are the 3 events that can controlled bt the reset mux:
- Device Reset
- An interrupt to the ARM_GIC
- An interrupt to the ARM_GIC followed by a device reset.

Right now to give a default watchdog behaviour "Device reset" is
being selected.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>

board/ti/ks2_evm/board_k2g.c

@@ -117,12 +117,28 @@ int board_mmc_init(bd_t *bis)
 #endif
 
 #ifdef CONFIG_BOARD_EARLY_INIT_F
+
+static void k2g_reset_mux_config(void)
+{
+	/* Unlock the reset mux register */
+	clrbits_le32(KS2_RSTMUX8, RSTMUX_LOCK8_MASK);
+
+	/* Configure BOOTCFG_RSTMUX8 for WDT event to cause a device reset */
+	clrsetbits_le32(KS2_RSTMUX8, RSTMUX_OMODE8_MASK,
+			RSTMUX_OMODE8_DEV_RESET << RSTMUX_OMODE8_SHIFT);
+
+	/* lock the reset mux register to prevent any spurious writes. */
+	setbits_le32(KS2_RSTMUX8, RSTMUX_LOCK8_MASK);
+}
+
 int board_early_init_f(void)
 {
 	init_plls();
 
 	k2g_mux_config();
 
+	k2g_reset_mux_config();
+
 	/* deassert FLASH_HOLD */
 	clrbits_le32(K2G_GPIO1_BANK2_BASE + K2G_GPIO_DIR_OFFSET,
 		     BIT(9));