diff options
| author | Anson Huang <Anson.Huang@nxp.com> | 2019-06-26 15:44:15 +0800 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-07-22 09:36:48 +0800 |
| commit | 8dfe397431e0e05d9e66a9f20511833bda91f978 (patch) | |
| tree | bcc001063abbd1f798ec339dbba2c77c21fada2a /drivers/soc/imx | |
| parent | 3026d0b7a4972fd5fb56f5a454d1efe7534e84fc (diff) | |
| download | linux-8dfe397431e0e05d9e66a9f20511833bda91f978.tar.bz2 | |
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: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/soc/imx')
| -rw-r--r-- | drivers/soc/imx/soc-imx8.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c index c19ef4b95668..b9831576dd25 100644 --- a/drivers/soc/imx/soc-imx8.c +++ b/drivers/soc/imx/soc-imx8.c @@ -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; } |