On Fri, Dec 08, 2017 at 02:46:41PM +0100, Geert Uytterhoeven wrote: > Certain EEPROMS have a size that is larger than the number of address > bytes would allow, and store the MSB of the address in bit 3 of the > instruction byte. > > This can be described in platform data using EE_INSTR_BIT3_IS_ADDR, or > in DT using the obsolete legacy "at25,addr-mode" property. > But currently there exists no non-deprecated way to describe this in DT. > > Hence extend the existing "address-width" DT property to allow > specifying 9 address bits, and enable support for that in the driver. > > This has been tested with a Microchip 25LC040A. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> > --- > v2: > - Do not consider odd address widths of 17 or 25 bits, > - Move handling inside the switch() statement. > --- > Documentation/devicetree/bindings/eeprom/at25.txt | 4 +++- > drivers/misc/eeprom/at25.c | 3 +++ > 2 files changed, 6 insertions(+), 1 deletion(-) Reviewed-by: Rob Herring <robh@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
