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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
gpio: ixp4xx: Add DT bindings
This adds DT bindings for the IXP4xx GPIO controller.
Cc: devicetree@vger.kernel.org
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
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Documentation/devicetree/bindings/gpio/intel,ixp4xx-gpio.txt
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Intel IXP4xx XScale Networking Processors GPIO
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This GPIO controller is found in the Intel IXP4xx processors.
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It supports 16 GPIO lines.
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The interrupt portions of the GPIO controller is hierarchical:
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the synchronous edge detector is part of the GPIO block, but the
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actual enabling/disabling of the interrupt line is done in the
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main IXP4xx interrupt controller which has a 1:1 mapping for
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the first 12 GPIO lines to 12 system interrupts.
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The remaining 4 GPIO lines can not be used for receiving
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interrupts.
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The interrupt parent of this GPIO controller must be the
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IXP4xx interrupt controller.
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Required properties:
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- compatible : Should be
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"intel,ixp4xx-gpio"
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- reg : Should contain registers location and length
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- gpio-controller : marks this as a GPIO controller
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- #gpio-cells : Should be 2, see gpio/gpio.txt
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- interrupt-controller : marks this as an interrupt controller
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- #interrupt-cells : a standard two-cell interrupt, see
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interrupt-controller/interrupts.txt
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Example:
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gpio0: gpio@c8004000 {
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compatible = "intel,ixp4xx-gpio";
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reg = <0xc8004000 0x1000>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};