soc: imx8: Add i.MX8MM UID(unique identifier) support (8dfe3974) · Commits · 戴 / test

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 <Anson.Huang@nxp.com> Signed-off-by:

Shawn Guo <shawnguo@kernel.org>

drivers/soc/imx/soc-imx8.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -66,6 +66,26 @@ out:
		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;
		}

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