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soc: imx8: Add i.MX8MQ UID(unique identifier) support 

Add i.MX8MQ SoC UID(unique identifier) support, user
can read it from sysfs:

root@imx8mqevk:~# cat /sys/devices/soc0/soc_uid
D56911D6F060954B

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Anson Huang 2019-07-18 15:13:11 +08:00 committed by Shawn Guo
parent 5f9e832c13
commit 3026d0b7a4
1 changed files with 22 additions and 0 deletions
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22
drivers/soc/imx/soc-imx8.c
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@ -16,6 +16,9 @@
#define IMX8MQ_SW_INFO_B1 0x40
#define IMX8MQ_SW_MAGIC_B1 0xff0055aa
#define OCOTP_UID_LOW 0x410
#define OCOTP_UID_HIGH 0x420
/* Same as ANADIG_DIGPROG_IMX7D */
#define ANADIG_DIGPROG_IMX8MM 0x800
@ -24,6 +27,16 @@ struct imx8_soc_data {
u32 (*soc_revision)(void);
};
static u64 soc_uid;
static ssize_t soc_uid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%016llX\n", soc_uid);
}
static DEVICE_ATTR_RO(soc_uid);
static u32 __init imx8mq_soc_revision(void)
{
struct device_node *np;
@ -42,6 +55,10 @@ static u32 __init imx8mq_soc_revision(void)
if (magic == IMX8MQ_SW_MAGIC_B1)
rev = REV_B1;
soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
soc_uid <<= 32;
soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
iounmap(ocotp_base);
out:
@ -140,6 +157,11 @@ static int __init imx8_soc_init(void)
goto free_rev;
}
ret = device_create_file(soc_device_to_device(soc_dev),
&dev_attr_soc_uid);
if (ret)
goto free_rev;
if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);