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>
This commit is contained in:
Linus Walleij 2019-02-21 16:44:41 +01:00
parent f8eb0235f6
commit 78517428a0
1 changed files with 38 additions and 0 deletions

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Intel IXP4xx XScale Networking Processors GPIO
This GPIO controller is found in the Intel IXP4xx processors.
It supports 16 GPIO lines.
The interrupt portions of the GPIO controller is hierarchical:
the synchronous edge detector is part of the GPIO block, but the
actual enabling/disabling of the interrupt line is done in the
main IXP4xx interrupt controller which has a 1:1 mapping for
the first 12 GPIO lines to 12 system interrupts.
The remaining 4 GPIO lines can not be used for receiving
interrupts.
The interrupt parent of this GPIO controller must be the
IXP4xx interrupt controller.
Required properties:
- compatible : Should be
"intel,ixp4xx-gpio"
- reg : Should contain registers location and length
- gpio-controller : marks this as a GPIO controller
- #gpio-cells : Should be 2, see gpio/gpio.txt
- interrupt-controller : marks this as an interrupt controller
- #interrupt-cells : a standard two-cell interrupt, see
interrupt-controller/interrupts.txt
Example:
gpio0: gpio@c8004000 {
compatible = "intel,ixp4xx-gpio";
reg = <0xc8004000 0x1000>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};