On Fri, Jun 11, 2021 at 07:26:52AM +0200, Jiri Prchal wrote: > Added sysfs fram and sernum file documentation. > > Signed-off-by: Jiri Prchal <jiri.prchal@xxxxxxxxxxx> > --- > v5: new > v6: no change here > v7: no change here > v8: added fram file doc > v9: rewritten description > --- > .../ABI/testing/sysfs-class-spi-eeprom | 20 +++++++++++++++++++ > 1 file changed, 20 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-class-spi-eeprom > > diff --git a/Documentation/ABI/testing/sysfs-class-spi-eeprom b/Documentation/ABI/testing/sysfs-class-spi-eeprom > new file mode 100644 > index 000000000000..4e69c78f9f65 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-class-spi-eeprom > @@ -0,0 +1,20 @@ > +What: /sys/class/spi_master/spi<bus>/spi<bus>.<dev>/sernum > +Date: May 2021 > +KernelVersion: 5.14 > +Contact: Jiri Prchal <jiri.prchal@xxxxxxxxxxx> > +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>/fram > +Date: June 2021 > +KernelVersion: 5.14 > +Contact: Jiri Prchal <jiri.prchal@xxxxxxxxxxx> > +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, capable > + of 10^14 read/write cycles and 151 years data retention. Are you sure of these statistics? Don't promise something here that might not be true, this is not a marketing document :) thanks, greg k-h
