Commit 73feb4d0 authored by Anson Huang's avatar Anson Huang Committed by Shawn Guo
Browse files

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: default avatarAnson Huang <Anson.Huang@nxp.com>
Reviewed-by: default avatarDaniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 77266e72

drivers/soc/imx/soc-imx-scu.c

+39 −0
Original line number Diff line number Diff line
@@ -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:

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