board: am62x: Add support for reading eeprom data

I2C EEPROM data contains the board name and its revision.
Add support for:
- Reading EEPROM data and store a copy at end of SRAM
- Updating env variable with relevant board info
- Printing board info during boot

Use the generic do_board_detect_am6() and setup_serial_am6()
functions to avoid code duplication across AM6x family boards.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
Signed-off-by: Guillaume La Roque (TI.com) <glaroque@baylibre.com>

arch/arm/mach-k3/am62x/Kconfig

@@ -14,6 +14,8 @@ config TARGET_AM625_A53_EVM
 	select ARM64
 	select BINMAN
 	select OF_SYSTEM_SETUP
+	imply TI_COMMON_CMD_OPTIONS
+	imply TI_I2C_BOARD_DETECT
 
 config TARGET_AM625_R5_EVM
 	bool "TI K3 based AM625 EVM running on R5"
@@ -25,6 +27,7 @@ config TARGET_AM625_R5_EVM
 	select K3_DDRSS
 	select BINMAN
 	imply SYS_K3_SPL_ATF
+	imply TI_I2C_BOARD_DETECT
 
 config TARGET_PHYCORE_AM62X_A53
 	bool "PHYTEC phyCORE-AM62x running on A53"

board/ti/am62x/evm.c

@@ -22,8 +22,15 @@
 #include <dm/uclass.h>
 #include <asm/arch/k3-ddr.h>
 
+#include "../common/board_detect.h"
 #include "../common/fdt_ops.h"
 
+#define board_is_am62x_skevm()  (board_ti_k3_is("AM62-SKEVM") || \
+				 board_ti_k3_is("AM62B-SKEVM"))
+#define board_is_am62b_p1_skevm() board_ti_k3_is("AM62B-SKEVM-P1")
+#define board_is_am62x_lp_skevm()  board_ti_k3_is("AM62-LP-SKEVM")
+#define board_is_am62x_sip_skevm()  board_ti_k3_is("AM62SIP-SKEVM")
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #if CONFIG_IS_ENABLED(SPLASH_SCREEN)
@@ -74,9 +81,51 @@ struct efi_capsule_update_info update_info = {
 	.images = fw_images,
 };
 
-#ifdef CONFIG_BOARD_LATE_INIT
+#if CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
+int checkboard(void)
+{
+	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+
+	if (!do_board_detect_am6())
+		printf("Board: %s rev %s\n", ep->name, ep->version);
+
+	return 0;
+}
+
+#if CONFIG_IS_ENABLED(BOARD_LATE_INIT)
+static void setup_board_eeprom_env(void)
+{
+	char *name = "am62x_skevm";
+
+	if (do_board_detect_am6())
+		goto invalid_eeprom;
+
+	if (board_is_am62x_skevm())
+		name = "am62x_skevm";
+	else if (board_is_am62b_p1_skevm())
+		name = "am62b_p1_skevm";
+	else if (board_is_am62x_lp_skevm())
+		name = "am62x_lp_skevm";
+	else if (board_is_am62x_sip_skevm())
+		name = "am62x_sip_skevm";
+	else
+		printf("Unidentified board claims %s in eeprom header\n",
+		       board_ti_get_name());
+
+invalid_eeprom:
+	set_board_info_env_am6(name);
+}
+#endif
+#endif
+
+#if CONFIG_IS_ENABLED(BOARD_LATE_INIT)
 int board_late_init(void)
 {
+	if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {
+		setup_board_eeprom_env();
+		setup_serial_am6();
+	}
+
 	ti_set_fdt_env(NULL, NULL);
 	return 0;
 }

configs/am62x_evm_r5_defconfig

@@ -85,6 +85,7 @@ CONFIG_SPL_CLK_K3_PLL=y
 CONFIG_SPL_CLK_K3=y
 CONFIG_TI_SCI_PROTOCOL=y
 CONFIG_DA8XX_GPIO=y
+CONFIG_DM_I2C=y
 CONFIG_DM_MAILBOX=y
 CONFIG_K3_SEC_PROXY=y
 CONFIG_SPL_MISC=y