From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Andrew F. Davis" Subject: [PATCH 1/2] dt-bindings: GPIO: Add generic serializer binding Date: Fri, 11 Dec 2015 13:46:23 -0600 Message-ID: <1449863184-29668-2-git-send-email-afd@ti.com> References: <1449863184-29668-1-git-send-email-afd@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1449863184-29668-1-git-send-email-afd@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Linus Walleij , Alexandre Courbot , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, "Andrew F. Davis" List-Id: devicetree@vger.kernel.org Add binding for generic parallel-in/serial-out shift register devices used as GPIO. Signed-off-by: Andrew F. Davis --- .../devicetree/bindings/gpio/gpio-pisosr.txt | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-pisosr.txt diff --git a/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt new file mode 100644 index 0000000..e69e8ec --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt @@ -0,0 +1,34 @@ +Generic Parallel-in/Serial-out Shift Register GPIO Driver + +This binding describes generic parallel-in/serial-out shift register +devices that can be used for GPI (General Purpose Input). This includes +SN74165 serial-out shift registers and the SN65HVS88x series of +industrial serializers. + +Required properties: + - compatible : Should be "pisosr-gpio". + - gpio-controller : Marks the device node as a GPIO controller. + - #gpio-cells : Should be two. For consumer use see gpio.txt. + +Optional properties: + - ngpios : Number of GPIO lines, default is 8. + - load-gpios : GPIO pin specifier attached to load enable, this + pin is pulsed before reading from the device to + load input pin values into the the device. + +For other required and optional properties of SPI slave +nodes please refer to ../spi/spi-bus.txt. + +Example: + + sn65hvs882@0 { + compatible = "pisosr-gpio"; + gpio-controller; + #gpio-cells = <2>; + + load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; + + reg = <0>; + spi-max-frequency = <1000000>; + spi-cpol; + }; -- 2.6.4