[U-Boot] [PATCH 2/2] mxc_ocotp: Disable fuse sense for imx8mq B1

[Peng Fan]

From: Ye Li <ye.li at nxp.com>

On iMX8MQ Rev B1, reading from fuse box is not allowed. The
OCOTP_READ_FUSE_DATA register is tied to magic number 0xff0055aa
for chip rev. So u-boot has to disable the fuse sense function for it.

Signed-off-by: Ye Li <ye.li at nxp.com>
Tested-by: Anson Huang <Anson.Huang at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/misc/mxc_ocotp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/misc/mxc_ocotp.c b/drivers/misc/mxc_ocotp.c
index 33ea31135c..1b945e9727 100644
--- a/drivers/misc/mxc_ocotp.c
+++ b/drivers/misc/mxc_ocotp.c
@@ -321,6 +321,11 @@ int fuse_sense(u32 bank, u32 word, u32 *val)
 	struct ocotp_regs *regs;
 	int ret;
 
+	if (is_imx8mq() && is_soc_rev(CHIP_REV_2_1)) {
+		printf("mxc_ocotp %s(): fuse sense is disabled\n", __func__);
+		return -EPERM;
+	}
+
 	ret = prepare_read(&regs, bank, word, val, __func__);
 	if (ret)
 		return ret;
-- 
2.16.4