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Commit 8dfe3974 authored by Anson Huang's avatar Anson Huang Committed by Shawn Guo
Browse files

soc: imx8: Add i.MX8MM UID(unique identifier) support 



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: default avatarAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 3026d0b7

drivers/soc/imx/soc-imx8.c

+23 −0
Original line number Diff line number Diff line
@@ -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;

}