xref: /linux/Documentation/ABI/testing/sysfs-driver-jz4780-efuse (revision 49ab19a4a51a31cb06992386cec4be82ebca5a2d)
1What:		/sys/devices/*/<our-device>/nvmem
2Date:		December 2017
3Contact:	PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
4Description:	read-only access to the efuse on the Ingenic JZ4780 SoC
5		The SoC has a one time programmable 8K efuse that is
6		split into segments. The driver supports read only.
7		The segments are:
8
9		===== ======== =================
10		0x000   64 bit Random Number
11		0x008  128 bit Ingenic Chip ID
12		0x018  128 bit Customer ID
13		0x028 3520 bit Reserved
14		0x1E0    8 bit Protect Segment
15		0x1E1 2296 bit HDMI Key
16		0x300 2048 bit Security boot key
17		===== ======== =================
18
19Users:		any user space application which wants to read the Chip
20		and Customer ID
21