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>

1 files changed, 69 insertions, 0 deletions

diff --git a/board/ti/j784s4/evm.c b/board/ti/j784s4/evm.c
index ae8622874e..11815b8096 100644
--- a/board/ti/j784s4/evm.c
+++ b/board/ti/j784s4/evm.c
@@ -90,6 +90,75 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 }
 #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)
 {
 	if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {