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Device tree binding documentation for Technologic's I2C-FPGA GPIO controller. Signed-off-by: Lucile Quirion <lucile.quirion@savoirfairelinux.com> [Quirked in a reference to gpio.txt] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
31 lines
894 B
Plaintext
31 lines
894 B
Plaintext
* Technologic Systems I2C-FPGA's GPIO controller bindings
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This bindings describes the GPIO controller for Technologic's FPGA core.
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TS-4900's FPGA encodes the GPIO state on 3 bits, whereas the TS-7970's FPGA
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uses 2 bits: it doesn't use a dedicated input bit.
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Required properties:
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- compatible: Should be one of the following
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"technologic,ts4900-gpio"
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"technologic,ts7970-gpio"
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- reg: Physical base address of the controller and length
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of memory mapped region.
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- #gpio-cells: Should be two. The first cell is the pin number.
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- gpio-controller: Marks the device node as a gpio controller.
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Optional property:
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- ngpios: Number of GPIOs this controller is instantiated with,
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the default is 32. See gpio.txt for more details.
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Example:
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&i2c2 {
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gpio8: gpio@28 {
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compatible = "technologic,ts4900-gpio";
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reg = <0x28>;
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#gpio-cells = <2>;
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gpio-controller;
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ngpios = <32>;
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};
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};
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