18c2ecf20Sopenharmony_ci==============================
28c2ecf20Sopenharmony_ciLinux I2C slave EEPROM backend
38c2ecf20Sopenharmony_ci==============================
48c2ecf20Sopenharmony_ci
58c2ecf20Sopenharmony_ciby Wolfram Sang <wsa@sang-engineering.com> in 2014-20
68c2ecf20Sopenharmony_ci
78c2ecf20Sopenharmony_ciThis backend simulates an EEPROM on the connected I2C bus. Its memory contents
88c2ecf20Sopenharmony_cican be accessed from userspace via this file located in sysfs::
98c2ecf20Sopenharmony_ci
108c2ecf20Sopenharmony_ci	/sys/bus/i2c/devices/<device-directory>/slave-eeprom
118c2ecf20Sopenharmony_ci
128c2ecf20Sopenharmony_ciThe following types are available: 24c02, 24c32, 24c64, and 24c512. Read-only
138c2ecf20Sopenharmony_civariants are also supported. The name needed for instantiating has the form
148c2ecf20Sopenharmony_ci'slave-<type>[ro]'. Examples follow:
158c2ecf20Sopenharmony_ci
168c2ecf20Sopenharmony_ci24c02, read/write, address 0x64:
178c2ecf20Sopenharmony_ci  # echo slave-24c02 0x1064 > /sys/bus/i2c/devices/i2c-1/new_device
188c2ecf20Sopenharmony_ci
198c2ecf20Sopenharmony_ci24c512, read-only, address 0x42:
208c2ecf20Sopenharmony_ci  # echo slave-24c512ro 0x1042 > /sys/bus/i2c/devices/i2c-1/new_device
218c2ecf20Sopenharmony_ci
228c2ecf20Sopenharmony_ciYou can also preload data during boot if a device-property named
238c2ecf20Sopenharmony_ci'firmware-name' contains a valid filename (DT or ACPI only).
248c2ecf20Sopenharmony_ci
258c2ecf20Sopenharmony_ciAs of 2015, Linux doesn't support poll on binary sysfs files, so there is no
268c2ecf20Sopenharmony_cinotification when another master changed the content.
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