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 <p...@kernel.org> --- board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c | 28 +++++++++++++++++++++ 1 file changed, 28 insertions(+) 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 a71952dcf399..06cab729e4ab 100644 --- a/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c +++ b/board/freescale/p1_p2_rdb_pc/p1_p2_rdb_pc.c @@ -368,6 +368,24 @@ 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) { @@ -393,6 +411,8 @@ 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 @@ -444,3 +464,11 @@ 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 -- 2.20.1