[PATCH v2 1/4] board: ti: common: Add generic AM6x board detection functions

[Guillaume La Roque (TI.com)]

Add two new generic functions for AM6x family boards to simplify
board-specific implementations:

- do_board_detect_am6(): Generic board detection function that reads
  the on-board EEPROM. It first attempts to read at the configured
  address, and if that fails, tries the alternate address
  (CONFIG_EEPROM_CHIP_ADDRESS + 1). This provides a common
  implementation that can be used across different AM6x boards.

- setup_serial_am6(): Sets up the serial number environment variable
  from the EEPROM data. The serial number is converted from
  hexadecimal string format to a 16-character hexadecimal
  representation and stored in the "serial#" environment variable.

Both functions are protected by CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
and are designed to be used by AM62x, AM64x, AM65x, and other AM6x
family boards.

Signed-off-by: Guillaume La Roque (TI.com) <glaroque at baylibre.com>
---
 board/ti/common/board_detect.c | 43 ++++++++++++++++++++++++++++++++++++++++++
 board/ti/common/board_detect.h | 22 +++++++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
index a43cc075b92..d49e26fa453 100644
--- a/board/ti/common/board_detect.c
+++ b/board/ti/common/board_detect.c
@@ -824,3 +824,46 @@ bool __maybe_unused board_ti_was_eeprom_read(void)
 	else
 		return false;
 }
+
+#if CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
+int do_board_detect_am6(void)
+{
+	int ret;
+
+	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;
+}
+
+void setup_serial_am6(void)
+{
+	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+	unsigned long board_serial;
+	char *endp;
+	char serial_string[17] = { 0 };
+
+	if (env_get("serial#"))
+		return;
+
+	board_serial = simple_strtoul(ep->serial, &endp, 16);
+	if (*endp != '\0') {
+		pr_err("Error: Can't set serial# to %s\n", ep->serial);
+		return;
+	}
+
+	snprintf(serial_string, sizeof(serial_string), "%016lx", board_serial);
+	env_set("serial#", serial_string);
+}
+#endif
diff --git a/board/ti/common/board_detect.h b/board/ti/common/board_detect.h
index b057f3b2269..26ada2a449c 100644
--- a/board/ti/common/board_detect.h
+++ b/board/ti/common/board_detect.h
@@ -313,6 +313,28 @@ int __maybe_unused ti_i2c_eeprom_am6_get(int bus_addr, int dev_addr,
  */
 int __maybe_unused ti_i2c_eeprom_am6_get_base(int bus_addr, int dev_addr);
 
+/**
+ * do_board_detect_am6() - Detect AM6x board and read EEPROM data
+ *
+ * This is a generic board detection function for AM6x family boards.
+ * It attempts to read the on-board EEPROM at the configured address,
+ * and if that fails, tries the alternate address (CONFIG_EEPROM_CHIP_ADDRESS + 1).
+ *
+ * Return: 0 on success or corresponding error on failure.
+ */
+int do_board_detect_am6(void);
+
+/**
+ * setup_serial_am6() - Setup serial number environment variable for AM6x boards
+ *
+ * This function reads the serial number from the AM6x EEPROM data and
+ * sets the "serial#" environment variable. The serial number is converted
+ * from hexadecimal string format to a 16-character hexadecimal representation.
+ *
+ * EEPROM should be already read before calling this function.
+ */
+void setup_serial_am6(void);
+
 #ifdef CONFIG_TI_I2C_BOARD_DETECT
 /**
  * board_ti_is() - Board detection logic for TI EVMs

-- 
2.34.1