From 9d6a8dab8d8b94975d7d78a7866053bd1c9444ca Mon Sep 17 00:00:00 2001
From: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Date: Tue, 24 Oct 2017 10:54:27 +0100
Subject: [PATCH] nvmem: imx-ocotp: Restrict OTP write to IMX6 processors
Git-commit: 9d6a8dab8d8b94975d7d78a7866053bd1c9444ca
Patch-mainline: v4.15-rc1
References: bsc#1051510
i.MX7S/D have a different scheme for addressing the OTP registers inside
the OCOTP block. Currently it's possible to address the wrong OTP registers
given the disparity between IMX6 and IMX7 OTP addressing.
Since OTP programming is one-time destructive its important we restrict
this interface ASAP.
Fixes: 0642bac7da42 ("nvmem: imx-ocotp: add write support")
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/nvmem/imx-ocotp.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
index e57e2a57aa3f..653cff9d9927 100644
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -346,6 +346,8 @@ static int imx_ocotp_probe(struct platform_device *pdev)
imx_ocotp_nvmem_config.dev = dev;
imx_ocotp_nvmem_config.priv = priv;
priv->config = &imx_ocotp_nvmem_config;
+ if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx7d-ocotp"))
+ imx_ocotp_nvmem_config.read_only = true;
nvmem = nvmem_register(&imx_ocotp_nvmem_config);
if (IS_ERR(nvmem))
--
2.16.4