diff options
| author | Anson Huang <Anson.Huang@nxp.com> | 2019-07-18 09:13:11 +0200 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-07-22 03:36:48 +0200 |
| commit | 3026d0b7a4972fd5fb56f5a454d1efe7534e84fc (patch) | |
| tree | 34d2fe367a821738dbc4bd9f44c34f62b72d75a1 /drivers/soc/imx | |
| parent | Linus 5.3-rc1 (diff) | |
| download | linux-3026d0b7a4972fd5fb56f5a454d1efe7534e84fc.tar.xz linux-3026d0b7a4972fd5fb56f5a454d1efe7534e84fc.zip | |
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>
Diffstat (limited to 'drivers/soc/imx')
| -rw-r--r-- | drivers/soc/imx/soc-imx8.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c index f924ae8c6514..c19ef4b95668 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); |