From: Marian Cingel <cingel.marian@gmail.com>
Date: Sat, 8 Nov 2025 23:23:25 +0000 (+0000)
Subject: board: ti: CAT24C256WI-GT3 require min. 5ms delay (tWR) between write/read
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e8eff6d7a9ad2c605185e5b3d8c22ccd26733dc;p=thirdparty%2Fu-boot.git

board: ti: CAT24C256WI-GT3 require min. 5ms delay (tWR) between write/read

Otherwise the custom-cape eeprom (at address 57) reports NACK which
results into "i2c_write: error waiting for data ACK (status=0x116)" and
terminates further scanning.

Signed-off-by: Marian Cingel <cingel.marian@gmail.com>
---

diff --git a/board/ti/common/cape_detect.c b/board/ti/common/cape_detect.c
index 0bd4a38c187..88fa6ae81f0 100644
--- a/board/ti/common/cape_detect.c
+++ b/board/ti/common/cape_detect.c
@@ -9,6 +9,7 @@
 #include <i2c.h>
 #include <extension_board.h>
 #include <vsprintf.h>
+#include <linux/delay.h>
 
 #include "cape_detect.h"
 
@@ -43,6 +44,8 @@ static int ti_extension_board_scan(struct udevice *dev,
 
 		/* Move the read cursor to the beginning of the EEPROM */
 		dm_i2c_write(dev, 0, &cursor, 1);
+		/* Need 5ms (tWR) to complete internal write */
+		mdelay(6);
 		ret = dm_i2c_read(dev, 0, (uint8_t *)&eeprom_header,
 				  sizeof(struct am335x_cape_eeprom_id));
 		if (ret) {