linux-kernel - [PATCH 4.9 091/105] nvmem: imx-ocotp: Fix wrong register size

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Date:   Fri,  4 Aug 2017 16:15:59 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Schultz <d.schultz@...tec.de>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 091/105] nvmem: imx-ocotp: Fix wrong register size

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Schultz <d.schultz@...tec.de>


[ Upstream commit 14ba972842f9e84e6d3264bc0302101b8a792288 ]

All i.MX6 SoCs have an OCOTP Controller with 4kbit fuses. The i.MX6SL is
an exception and has only 2kbit fuses.

In the TRM for the i.MX6DQ (IMX6QDRM - Rev 2, 06/2014) the fuses size is
described in chapter 46.1.1 with:
"32-bit word restricted program and read to 4Kbits of eFuse OTP(512x8)."

In the TRM for the i.MX6SL (IMX6SLRM - Rev 2, 06/2015) the fuses size is
described in chapter 34.1.1 with:
"32-bit word restricted program and read to 2 kbit of eFuse OTP(128x8)."

Since the Freescale Linux kernel OCOTP driver works with a fuses size of
2 kbit for the i.MX6SL, it looks like the TRM is wrong and the formula
to calculate the correct fuses size has to be 256x8.

Signed-off-by: Daniel Schultz <d.schultz@...tec.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nvmem/imx-ocotp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -71,7 +71,7 @@ static struct nvmem_config imx_ocotp_nvm
 
 static const struct of_device_id imx_ocotp_dt_ids[] = {
 	{ .compatible = "fsl,imx6q-ocotp",  (void *)128 },
-	{ .compatible = "fsl,imx6sl-ocotp", (void *)32 },
+	{ .compatible = "fsl,imx6sl-ocotp", (void *)64 },
 	{ .compatible = "fsl,imx6sx-ocotp", (void *)128 },
 	{ },
 };