Starting with pmic firmware version 5 the watchdog is enabled with a timeout window of 13 minutes by default.
The TI EVMs use a dip switch to control a gpio on the pmic which gets configured as DISABLE_WDOG by the firmware. On the phycore_am68x there is no such dip switch so pull resistors would be necessary. Using mcu_i2c0 to turn off the pmic watchdog works with all hardware and pmic firmware combinations. Signed-off-by: Dominik Haller <[email protected]> --- board/phytec/phycore_am68x/phycore-am68x.c | 41 ++++++++++++++++++++++ configs/phycore_am68x_a72_defconfig | 1 - 2 files changed, 41 insertions(+), 1 deletion(-) diff --git a/board/phytec/phycore_am68x/phycore-am68x.c b/board/phytec/phycore_am68x/phycore-am68x.c index 312d7ece23e2..9b71a4bdc680 100644 --- a/board/phytec/phycore_am68x/phycore-am68x.c +++ b/board/phytec/phycore_am68x/phycore-am68x.c @@ -21,6 +21,7 @@ #include <dm/uclass-internal.h> #include <dm/root.h> #include <asm/arch/k3-ddr.h> +#include <i2c.h> DECLARE_GLOBAL_DATA_PTR; @@ -69,6 +70,46 @@ void spl_perform_board_fixups(struct spl_image_info *spl_image) } #endif +#define TPS6594_I2C_WD_ADDR 0x12 +#define WD_THR_CFG_REG 0x09 +#define WD_EN BIT(6) + +int tps6594_disable_watchdog(void) +{ + struct udevice *i2c_bus, *i2c_dev; + int ret; + u8 val; + + ret = uclass_get_device_by_name(UCLASS_I2C, "i2c@40b00000", &i2c_bus); + if (ret) + return ret; + + ret = dm_i2c_probe(i2c_bus, TPS6594_I2C_WD_ADDR, 0, &i2c_dev); + if (ret) + return ret; + + ret = dm_i2c_reg_read(i2c_dev, WD_THR_CFG_REG); + if (ret < 0) + return ret; + + val = (u8)ret; + val &= ~WD_EN; + ret = dm_i2c_reg_write(i2c_dev, WD_THR_CFG_REG, val); + + return ret; +} + +int board_init(void) +{ + int ret; + + ret = tps6594_disable_watchdog(); + if (ret) + printf("disabling TPS6594 watchdog failed: %d\n", ret); + + return 0; +} + void spl_board_init(void) { struct udevice *dev; diff --git a/configs/phycore_am68x_a72_defconfig b/configs/phycore_am68x_a72_defconfig index 5ede3eb73e7f..e74e604e1bc7 100644 --- a/configs/phycore_am68x_a72_defconfig +++ b/configs/phycore_am68x_a72_defconfig @@ -38,7 +38,6 @@ CONFIG_OF_SYSTEM_SETUP=y CONFIG_BOOTCOMMAND="bootflow scan -lb; run ${boot}boot" CONFIG_DEFAULT_FDT_FILE="oftree" CONFIG_LOGLEVEL=7 -# CONFIG_BOARD_INIT is not set CONFIG_SPL_MAX_SIZE=0xc0000 CONFIG_SPL_BOARD_INIT=y CONFIG_SPL_SYS_MALLOC_SIMPLE=y -- 2.43.0
