2019-06-26 07:44:07

by Anson Huang

Subject: [PATCH 1/2] soc: imx8: Add i.MX8MQ UID(unique identifier) support

From: Anson Huang <[email protected]>

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 <[email protected]>
---
drivers/soc/imx/soc-imx8.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index f924ae8..c19ef4b 100644
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -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);

--
2.7.4

2019-07-18 07:16:30

by Shawn Guo

Subject: Re: [PATCH 1/2] soc: imx8: Add i.MX8MQ UID(unique identifier) support

On Wed, Jun 26, 2019 at 03:44:14PM +0800, [email protected] wrote:
> From: Anson Huang <[email protected]>
>
> 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 <[email protected]>

Applied both, thanks.