toradex: tdx-cfg-block: add support for EEPROM

This introduces support for EEPROM as a storage for the main Toradex
config block and additional config blocks on extra EEPROM chips (on
carrier board or video adapters).

To enable EEPROM as a storage for the main config block:
TDX_HAVE_EEPROM=y.

For additional EEPROMs please enable this Kconfig symbol:
TDX_CFG_BLOCK_EXTRA=y.

Information about existing EEPROM chips is provide via Device Tree using
aliases.

You can also write configuration for the carrier board using create_carrier
subcommand for cfgblock. Example:

Verdin iMX8MM # cfgblock create_carrier
Supported carrier boards:
UNKNOWN CARRIER                     = [0]
Verdin Carrier Board                = [1]
Choose your carrier board (provide ID): 1
Enter carrier board version (e.g. V1.1B): V1.0A
Enter carrier board serial number: 10622780

Also with barcode:
cVerdin iMX8MM # cfgblock create carrier -y 0156100010622780

Relates-to: ELB-1402
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/board/toradex/common/tdx-eeprom.h b/board/toradex/common/tdx-eeprom.h
new file mode 100644
index 0000000000..a6772d2f3f
--- /dev/null
+++ b/board/toradex/common/tdx-eeprom.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2020 Toradex
+ */
+
+#ifndef _TDX_EEPROM_H
+#define _TDX_EEPROM_H
+
+#include <i2c_eeprom.h>
+
+int read_tdx_eeprom_data(u32 eeprom_id, int offset, uint8_t *buf, int size);
+int write_tdx_eeprom_data(u32 eeprom_id, int offset, uint8_t *buf, int size);
+
+#endif /* _TDX_EEPROM_H */