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- GPIO via CREG (control registers) driver
- 31 9 7 5 0 < bit number
- | | | | |
- [ not used | gpio-1 | gpio-0 | <-shift-> ] < 32 bit register
- ^ ^
- | |
- write 0x2 == set output to "1" (activate)
- write 0x3 == set output to "0" (deactivate)
- Required properties:
- - compatible : "snps,creg-gpio"
- - reg : Exactly one register range with length 0x4.
- - #gpio-cells : Should be one - the pin number.
- - gpio-controller : Marks the device node as a GPIO controller.
- - gpio-count: Number of GPIO pins.
- - gpio-bit-per-line: Number of bits per gpio line (see picture).
- - gpio-first-shift: Shift (in bits) of the first GPIO field in register
- (see picture).
- - gpio-activate-val: Value should be set in corresponding field to set
- output to "1" (see picture). Applied to all GPIO ports.
- - gpio-deactivate-val: Value should be set in corresponding field to set
- output to "0" (see picture). Applied to all GPIO ports.
- Optional properties:
- - gpio-bank-name: name of bank (as default driver name is used is used)
- - gpio-default-val: array of default output values (must me 0 or 1)
- Example (see picture):
- gpio: gpio@f00014b0 {
- compatible = "snps,creg-gpio";
- reg = <0xf00014b0 0x4>;
- gpio-controller;
- #gpio-cells = <1>;
- gpio-bank-name = "hsdk-spi-cs";
- gpio-count = <2>;
- gpio-first-shift = <5>;
- gpio-bit-per-line = <2>;
- gpio-activate-val = <2>;
- gpio-deactivate-val = <3>;
- gpio-default-val = <1 1>;
- };
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