On Wed, Dec 09, 2020 at 11:27:07PM +0530, Aswath Govindraju wrote: > Dummy zero bits are sent before data during a read transfer. This causes > the data read to be shifted to the right. To fix this send zero bits after > the address during a read transfer. > > Add property to send zero bits after the address during a read transfer.
When is this necessary? Why can't it be implied by the compatible string which should be specific to the chip model? > > Suggested-by: Vignesh Raghavendra <[email protected]> > Signed-off-by: Aswath Govindraju <[email protected]> > --- > Documentation/devicetree/bindings/misc/eeprom-93xx46.txt | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt > b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt > index a8ebb4621f79..09fb1cec54f0 100644 > --- a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt > +++ b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt > @@ -10,7 +10,9 @@ Optional properties: > - read-only : parameter-less property which disables writes to the EEPROM > - select-gpios : if present, specifies the GPIO that will be asserted prior > to > each access to the EEPROM (e.g. for SPI bus multiplexing) > - > +- read-op-dummy-cycles: If present specifies the number of dummy zero-bits to > + be sent after the address during a read transfer to ignore any bits sent > + preceding the data. > Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt > apply. In particular, "reg" and "spi-max-frequency" properties must be > given. > > -- > 2.17.1 >
