Messages in this thread | | | Date | Tue, 22 Dec 2015 02:01:51 +0200 | From | Vladimir Zapolskiy <> | Subject | Re: [PATCH v4 2/5] Documentation: devicetree: Add DT bindings to eeprom_93xx46 driver. |
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Hi Cory,
On 10.12.2015 06:00, Cory Tusar wrote: > This commit documents bindings to be added to the eeprom_93xx46 driver > which will allow: > > - Device word size and read-only attributes to be specified. > - A device-specific compatible string for use with Atmel AT93C46D > EEPROMs. > - Specifying a GPIO line to function as a 'select' or 'enable' signal > prior to accessing the EEPROM. > > Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com> > Acked-by: Rob Herring <robh@kernel.org> > Tested-by: Chris Healy <chris.healy@zii.aero> > --- > .../devicetree/bindings/misc/eeprom-93xx46.txt | 25 ++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt > new file mode 100644 > index 0000000..a8ebb46 > --- /dev/null > +++ b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt > @@ -0,0 +1,25 @@ > +EEPROMs (SPI) compatible with Microchip Technology 93xx46 family. > + > +Required properties: > +- compatible : shall be one of: > + "atmel,at93c46d" > + "eeprom-93xx46"
the second compatible property value is not recommended by ePAPR, I would suggest to remove it from here and from the example below.
But I see that Rob acked this change though...
> +- data-size : number of data bits per word (either 8 or 16) > + > +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) > + > +Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt > +apply. In particular, "reg" and "spi-max-frequency" properties must be given. > + > +Example: > + eeprom@0 { > + compatible = "eeprom-93xx46"; > + reg = <0>; > + spi-max-frequency = <1000000>; > + spi-cs-high; > + data-size = <8>; > + select-gpios = <&gpio4 4 GPIO_ACTIVE_HIGH>; > + }; >
-- With best wishes, Vladimir
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