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board: ti: j784s4: Add support for board detection by EEPROM read 

The board name is programmed in the EEPROM. Add support for board
detection and choose the right dtb based on the board name read
from EEPROM.
The J784S4/AM69 has two platforms naming J784S4-EVM and AM69-SK. The
J784S4 has EEPROM populated at 0x50. AM69 SK has EEPROM
populated at next address 0x51. So start looking for TI specific EEPROM
at 0x50, if not found look for EEPROM at 0x51.

Signed-off-by: Dasnavis Sabiya <sabiya.d@ti.com>
This commit is contained in:
Dasnavis Sabiya 2023-06-02 19:26:14 +05:30 committed by Praneeth Bajjuri
parent e51f867304
commit 80f0787237
1 changed files with 69 additions and 0 deletions
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69
board/ti/j784s4/evm.c
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@ -90,6 +90,75 @@ int ft_board_setup(void *blob, struct bd_info *bd)
} }
#endif #endif
#ifdef CONFIG_TI_I2C_BOARD_DETECT
int do_board_detect(void)
{
int ret;
if (board_ti_was_eeprom_read())
return 0;
ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
CONFIG_EEPROM_CHIP_ADDRESS);
if (ret) {
printf("EEPROM not available at 0x%02x, trying to read at 0x%02x\n",
CONFIG_EEPROM_CHIP_ADDRESS, CONFIG_EEPROM_CHIP_ADDRESS + 1);
ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
CONFIG_EEPROM_CHIP_ADDRESS + 1);
if (ret)
pr_err("Reading on-board EEPROM at 0x%02x failed %d\n",
CONFIG_EEPROM_CHIP_ADDRESS + 1, ret);
}
return ret;
}
int checkboard(void)
{
struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
if (do_board_detect())
/* EEPROM not populated */
printf("Board: %s rev %s\n", "J784S4-EVM", "E1");
else
printf("Board: %s rev %s\n", ep->name, ep->version);
return 0;
}
static void setup_board_eeprom_env(void)
{
char *name = "j784s4";
if (do_board_detect())
goto invalid_eeprom;
if (board_is_j784s4_evm())
name = "j784s4";
else
printf("Unidentified board claims %s in eeprom header\n",
board_ti_get_name());
invalid_eeprom:
set_board_info_env_am6(name);
}
#ifdef CONFIG_SPL_LOAD_FIT
int board_fit_config_name_match(const char *name)
{
bool eeprom_read = board_ti_was_eeprom_read();
if (!eeprom_read || board_is_j784s4_evm()) {
if ((!strcmp(name, "k3-j784s4-evm")) || (!strcmp(name, "k3-j784s4-r5-evm")))
return 0;
}
return -1;
}
#endif
#endif
int board_late_init(void) int board_late_init(void)
{ {
if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) { if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {