linux-kernel - [PATCH] ARM: imx: Add i.MX7ULP SoC serial number support

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Message-Id: <1572852931-24101-1-git-send-email-Anson.Huang@nxp.com>
Date:   Mon,  4 Nov 2019 15:35:31 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     linux@...linux.org.uk, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, aisheng.dong@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH] ARM: imx: Add i.MX7ULP SoC serial number support

i.MX7ULP's unique ID layout in OCOTP is different from other
i.MX6/7 SoCs as below:

OCOTP layout		unique ID

0x4b0 bit[15:0]		bit[15:0]
0x4c0 bit[15:0]		bit[31:16]
0x4d0 bit[15:0]		bit[47:32]
0x4e0 bit[15:0]		bit[63:48]

Add support for reading serial number from OCOTP on i.MX7ULP.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 arch/arm/mach-imx/cpu.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
index d811803..d70b6fc 100644
--- a/arch/arm/mach-imx/cpu.c
+++ b/arch/arm/mach-imx/cpu.c
@@ -15,6 +15,11 @@
 #define OCOTP_UID_H	0x420
 #define OCOTP_UID_L	0x410
 
+#define OCOTP_ULP_UID_1		0x4b0
+#define OCOTP_ULP_UID_2		0x4c0
+#define OCOTP_ULP_UID_3		0x4d0
+#define OCOTP_ULP_UID_4		0x4e0
+
 unsigned int __mxc_cpu_type;
 static unsigned int imx_soc_revision;
 
@@ -164,6 +169,7 @@ struct device * __init imx_soc_device_init(void)
 		soc_id = "i.MX7D";
 		break;
 	case MXC_CPU_IMX7ULP:
+		ocotp_compat = "fsl,imx7ulp-ocotp";
 		soc_id = "i.MX7ULP";
 		break;
 	default:
@@ -176,11 +182,25 @@ struct device * __init imx_soc_device_init(void)
 		if (IS_ERR(ocotp))
 			pr_err("%s: failed to find %s regmap!\n", __func__, ocotp_compat);
 
-		regmap_read(ocotp, OCOTP_UID_H, &val);
-		soc_uid = val;
-		regmap_read(ocotp, OCOTP_UID_L, &val);
-		soc_uid <<= 32;
-		soc_uid |= val;
+		if (__mxc_cpu_type == MXC_CPU_IMX7ULP) {
+			regmap_read(ocotp, OCOTP_ULP_UID_4, &val);
+			soc_uid = val & 0xffff;
+			regmap_read(ocotp, OCOTP_ULP_UID_3, &val);
+			soc_uid <<= 16;
+			soc_uid |= val & 0xffff;
+			regmap_read(ocotp, OCOTP_ULP_UID_2, &val);
+			soc_uid <<= 16;
+			soc_uid |= val & 0xffff;
+			regmap_read(ocotp, OCOTP_ULP_UID_1, &val);
+			soc_uid <<= 16;
+			soc_uid |= val & 0xffff;
+		} else {
+			regmap_read(ocotp, OCOTP_UID_H, &val);
+			soc_uid = val;
+			regmap_read(ocotp, OCOTP_UID_L, &val);
+			soc_uid <<= 32;
+			soc_uid |= val;
+		}
 	}
 
 	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
-- 
2.7.4