MLK-17081 arm64: imx8mq: export chip unique id

cat /sys/devices/soc0/soc_uid
1b1331d6f0609502

Signed-off-by: Frank Li <Frank.Li@nxp.com>

diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index 1181874..de34a5e 100644 (file)
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -37,6 +37,7 @@ struct imx8_soc_data {
 
 static u32 imx8_soc_id;
 static u32 imx8_soc_rev = IMX_CHIP_REVISION_UNKNOWN;
+static u64 imx8_soc_uid;
 
 static const struct imx8_soc_data *soc_data;
 
@@ -151,8 +152,42 @@ static u32 imx8qxp_soc_revision(void)
        return imx_init_revision_from_scu();
 }
 
+#define OCOTP_UID_LOW  0x410
+#define OCOTP_UID_HIGH 0x420
+
+static u64 imx8mq_soc_get_soc_uid(void)
+{
+       struct device_node *np;
+       void __iomem *base;
+
+       u64 val = 0;
+
+       np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
+       if (!np) {
+               pr_warn("failed to find ocotp node\n");
+               return val;
+       }
+
+       base = of_iomap(np, 0);
+       if (!base) {
+               pr_warn("failed to map ocotp\n");
+               goto put_node;
+       }
+
+       val = readl_relaxed(base + OCOTP_UID_HIGH);
+       val <<= 32;
+       val |=  readl_relaxed(base + OCOTP_UID_LOW);
+
+       iounmap(base);
+
+put_node:
+       of_node_put(np);
+       return val;
+}
+
 static u32 imx8mq_soc_revision(void)
 {
+       imx8_soc_uid = imx8mq_soc_get_soc_uid();
        return imx_init_revision_from_atf();
 }
 
@@ -212,6 +247,16 @@ static int __init imx8_revision_init(void)
 }
 early_initcall(imx8_revision_init);
 
+static ssize_t imx8_get_soc_uid(struct device *dev,
+                       struct device_attribute *attr,
+                       char *buf)
+{
+       return sprintf(buf, "%016llx\n", imx8_soc_uid);
+}
+
+static struct device_attribute imx8_uid =
+       __ATTR(soc_uid, S_IRUGO, imx8_get_soc_uid, NULL);
+
 static int __init imx8_soc_init(void)
 {
        struct soc_device_attribute *soc_dev_attr;
@@ -240,6 +285,8 @@ static int __init imx8_soc_init(void)
        if (IS_ERR(soc_dev))
                goto free_rev;
 
+       device_create_file(soc_device_to_device(soc_dev), &imx8_uid);
+
        return 0;
 
 free_rev: