From: Anson Huang <[email protected]>
Add i.MX8MM SoC UID(unique identifier) support, user
can read it from sysfs:
root@imx8mmevk:~# cat /sys/devices/soc0/soc_uid
B365FA0A5C85D6EE
Signed-off-by: Anson Huang <[email protected]>
---
drivers/soc/imx/soc-imx8.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index c19ef4b..b9831576 100644
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -66,6 +66,26 @@ static u32 __init imx8mq_soc_revision(void)
return rev;
}
+static void __init imx8mm_soc_uid(void)
+{
+ void __iomem *ocotp_base;
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
+ if (!np)
+ return;
+
+ ocotp_base = of_iomap(np, 0);
+ WARN_ON(!ocotp_base);
+
+ soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
+ soc_uid <<= 32;
+ soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
+
+ iounmap(ocotp_base);
+ of_node_put(np);
+}
+
static u32 __init imx8mm_soc_revision(void)
{
struct device_node *np;
@@ -83,6 +103,9 @@ static u32 __init imx8mm_soc_revision(void)
iounmap(anatop_base);
of_node_put(np);
+
+ imx8mm_soc_uid();
+
return rev;
}
--
2.7.4