board: freescale: p1_p2_rdb_pc: Delete watchdog max6370 node in load_default mode

CPLD in load_default mode ignores watchdog reset signal. It does not reset
board when watchdog triggers reset signal.

Detect load_default mode by GPIO7 - LOAD_DEFAULT_N and delete watchdog
max6370 node from device to prevent registering driver for non-working
watchdog.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

diff --git a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
index 25906d3..b301491 100644 (file)
--- a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
+++ b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c
@@ -414,6 +414,24 @@ int board_eth_init(struct bd_info *bis)
 }
 #endif
 
+#if defined(CONFIG_OF_BOARD_SETUP) || defined(CONFIG_OF_BOARD_FIXUP)
+static void fix_max6370_watchdog(void *blob)
+{
+       int off = fdt_node_offset_by_compatible(blob, -1, "maxim,max6370");
+       ccsr_gpio_t *pgpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
+       u32 gpioval = in_be32(&pgpio->gpdat);
+
+       /*
+        * Delete watchdog max6370 node in load_default mode (detected by
+        * GPIO7 - LOAD_DEFAULT_N) because CPLD in load_default mode ignores
+        * watchdog reset signal. CPLD in load_default mode does not reset
+        * board when watchdog triggers reset signal.
+        */
+       if (!(gpioval & BIT(31-7)) && off >= 0)
+               fdt_del_node(blob, off);
+}
+#endif
+
 #ifdef CONFIG_OF_BOARD_SETUP
 int ft_board_setup(void *blob, struct bd_info *bd)
 {
@@ -439,6 +457,8 @@ int ft_board_setup(void *blob, struct bd_info *bd)
                        sizeof("okay"), 0);
 #endif
 
+       fix_max6370_watchdog(blob);
+
 #if defined(CONFIG_HAS_FSL_DR_USB)
        fsl_fdt_fixup_dr_usb(blob, bd);
 #endif
@@ -490,3 +510,11 @@ int ft_board_setup(void *blob, struct bd_info *bd)
        return 0;
 }
 #endif
+
+#ifdef CONFIG_OF_BOARD_FIXUP
+int board_fix_fdt(void *blob)
+{
+       fix_max6370_watchdog(blob);
+       return 0;
+}
+#endif