What:		/sys/class/spi_master/spi<bus>/spi<bus>.<dev>/fram
Date:		June 2021
KernelVersion:	5.14
Contact:	Jiri Prchal <jiri.prchal@aksignal.cz>
Description:
	Contains the FRAM binary data. Same as EEPROM, just another file
	name to indicate that it employs ferroelectric process.
	It performs write operations at bus speed - no write delays.

What:		/sys/class/spi_master/spi<bus>/spi<bus>.<dev>/sernum
Date:		May 2021
KernelVersion:	5.14
Contact:	Jiri Prchal <jiri.prchal@aksignal.cz>
Description:
	Contains the serial number of the Cypress FRAM (FM25VN) if it is
	present.  It will be displayed as a 8 byte hex string, as read
	from the device.

	This is a read-only attribute.

What:		/sys/class/spi_master/spi<bus>/spi<bus>.<dev>/jedec_id
Date:		January 2026
KernelVersion:	6.19
Contact:	Patrick Wicki <patrick.wicki@siemens.com>
Description:
	Contains the raw JEDEC ID bytes returned by the RDID (0x9f) command. The
	bytes are exposed as a hex string in big-endian order as read from the
	device.

	This is a read-only attribute.