From ff229ecf8b4e5379d32c74f0486c2285e2ee27d4 Mon Sep 17 00:00:00 2001
From: "robertcnelson@gmail.com" <robertcnelson@gmail.com>
Date: Mon, 4 Feb 2013 06:03:10 +0000
Subject: [PATCH] beagle: expansion boards: retry i2c_read with 16bit
addressing
Some expansion boards now ship with at24 eeproms that need to communicate
via 16bit addressing.
Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
---
board/ti/beagle/beagle.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/board/ti/beagle/beagle.c b/board/ti/beagle/beagle.c
index b829a792b2..9493c6b492 100644
--- a/board/ti/beagle/beagle.c
+++ b/board/ti/beagle/beagle.c
@@ -227,6 +227,14 @@ static unsigned int get_expansion_id(void)
i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 1, (u8 *)&expansion_config,
sizeof(expansion_config));
+ /* retry reading configuration data with 16bit addressing */
+ if ((expansion_config.device_vendor == 0xFFFFFF00) ||
+ (expansion_config.device_vendor == 0xFFFFFFFF)) {
+ printf("EEPROM is blank or 8bit addressing failed: retrying with 16bit:\n");
+ i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 2, (u8 *)&expansion_config,
+ sizeof(expansion_config));
+ }
+
i2c_set_bus_num(TWL4030_I2C_BUS);
return expansion_config.device_vendor;
--
2.39.5