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Commit 3026d0b7 authored by Anson Huang's avatar Anson Huang Committed by Shawn Guo
Browse files

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: default avatarAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 5f9e832c

drivers/soc/imx/soc-imx8.c

+22 −0
Original line number Diff line number Diff line
@@ -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);