From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergio Paracuellos Subject: [PATCH v4 2/2] dt-bindings: document gpio-mt7621 bindings Date: Thu, 5 Jul 2018 15:43:11 +0200 Message-ID: <1530798191-25471-3-git-send-email-sergio.paracuellos@gmail.com> References: <1530798191-25471-1-git-send-email-sergio.paracuellos@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1530798191-25471-1-git-send-email-sergio.paracuellos@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" To: linus.walleij@linaro.org Cc: devicetree@vger.kernel.org, gregkh@linuxfoundation.org, driverdev-devel@linuxdriverproject.org, linux-gpio@vger.kernel.org, robh+dt@kernel.org, neil@brown.name List-Id: devicetree@vger.kernel.org Add a devicetree binding documentation for the mt7621 gpio. Signed-off-by: Sergio Paracuellos Reviewed-by: NeilBrown --- .../bindings/gpio/mediatek,mt7621-gpio.txt | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt diff --git a/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt b/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt new file mode 100644 index 0000000..ba45558 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/mediatek,mt7621-gpio.txt @@ -0,0 +1,35 @@ +Mediatek MT7621 SoC GPIO controller bindings + +The IP core used inside these SoCs has 3 banks of 32 GPIOs each. +The registers of all the banks are interwoven inside one single IO range. +We load one GPIO controller instance per bank. Also the GPIO controller can receive +interrupts on any of the GPIOs, either edge or level. It then interrupts the CPU +using GIC INT12. + +Required properties for the top level node: +- #gpio-cells : Should be two. The first cell is the GPIO pin number and the + second cell specifies GPIO flags, as defined in . + Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported. +- #interrupt-cells : Specifies the number of cells needed to encode an + interrupt. Should be 2. The first cell defines the interrupt number, + the second encodes the triger flags encoded as described in + Documentation/devicetree/bindings/interrupt-controller/interrupts.txt +- compatible: + - "mediatek,mt7621-gpio" for Mediatek controllers +- reg : Physical base address and length of the controller's registers +- interrupt-parent : phandle of the parent interrupt controller. +- interrupts : Interrupt specifier for the controllers interrupt. +- interrupt-controller : Mark the device node as an interrupt controller. +- gpio-controller : Marks the device node as a GPIO controller. + +Example: + gpio@600 { + #gpio-cells = <2>; + #interrupt-cells = <2>; + compatible = "mediatek,mt7621-gpio"; + gpio-controller; + interrupt-controller; + reg = <0x600 0x100>; + interrupt-parent = <&gic>; + interrupts = ; + }; -- 2.7.4