From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cory Tusar Subject: [PATCH v5 2/5] Documentation: devicetree: Add DT bindings to eeprom_93xx46 driver. Date: Wed, 6 Jan 2016 22:55:01 -0500 Message-ID: <1452138904-24820-3-git-send-email-cory.tusar@pid1solutions.com> References: <1452138904-24820-1-git-send-email-cory.tusar@pid1solutions.com> Return-path: In-Reply-To: <1452138904-24820-1-git-send-email-cory.tusar@pid1solutions.com> Sender: linux-kernel-owner@vger.kernel.org To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, gregkh@linuxfoundation.org Cc: jic23@kernel.org, vz@mleia.com, broonie@kernel.org, afd@ti.com, andrew@lunn.ch, Chris.Healy@zii.aero, Keith.Vennel@zii.aero, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Cory Tusar List-Id: devicetree@vger.kernel.org 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 Acked-by: Rob Herring Tested-by: Chris Healy --- .../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" +- 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>; + }; -- 2.4.10