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soc: imx-scu: Add SoC UID(unique identifier) support 

Add i.MX SCU SoC's UID(unique identifier) support, user
can read it from sysfs:

root@imx8qxpmek:~# cat /sys/devices/soc0/soc_uid
7B64280B57AC1898

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Anson Huang 2019-07-02 15:45:45 +08:00 committed by Shawn Guo
parent 77266e722f
commit 73feb4d0f8
1 changed files with 39 additions and 0 deletions
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39
drivers/soc/imx/soc-imx-scu.c
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@ -27,6 +27,40 @@ struct imx_sc_msg_misc_get_soc_id {
} data;
} __packed;
struct imx_sc_msg_misc_get_soc_uid {
struct imx_sc_rpc_msg hdr;
u32 uid_low;
u32 uid_high;
} __packed;
static ssize_t soc_uid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct imx_sc_msg_misc_get_soc_uid msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
u64 soc_uid;
int ret;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_MISC;
hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
hdr->size = 1;
ret = imx_scu_call_rpc(soc_ipc_handle, &msg, false);
if (ret) {
pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
return ret;
}
soc_uid = msg.uid_high;
soc_uid <<= 32;
soc_uid |= msg.uid_low;
return sprintf(buf, "%016llX\n", soc_uid);
}
static DEVICE_ATTR_RO(soc_uid);
static int imx_scu_soc_id(void)
{
struct imx_sc_msg_misc_get_soc_id msg;
@ -102,6 +136,11 @@ static int imx_scu_soc_probe(struct platform_device *pdev)
goto free_revision;
}
ret = device_create_file(soc_device_to_device(soc_dev),
&dev_attr_soc_uid);
if (ret)
goto free_revision;
return 0;
free_revision: