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-Lantiq SoC External Bus memory mapped GPIO controller
-
-By attaching hardware latches to the EBU it is possible to create output
-only gpios. This driver configures a special memory address, which when
-written to outputs 16 bit to the latches.
-
-The node describing the memory mapped GPIOs needs to be a child of the node
-describing the "lantiq,localbus".
-
-Required properties:
-- compatible : Should be "lantiq,gpio-mm-lantiq"
-- reg : Address and length of the register set for the device
-- #gpio-cells : Should be two. The first cell is the pin number and
- the second cell is used to specify optional parameters (currently
- unused).
-- gpio-controller : Marks the device node as a gpio controller.
-
-Optional properties:
-- lantiq,shadow : The default value that we shall assume as already set on the
- shift register cascade.
-
-Example:
-
-localbus@0 {
- #address-cells = <2>;
- #size-cells = <1>;
- ranges = <0 0 0x0 0x3ffffff /* addrsel0 */
- 1 0 0x4000000 0x4000010>; /* addsel1 */
- compatible = "lantiq,localbus", "simple-bus";
-
- gpio_mm0: gpio@4000000 {
- compatible = "lantiq,gpio-mm";
- reg = <1 0x0 0x10>;
- gpio-controller;
- #gpio-cells = <2>;
- lantiq,shadow = <0x77f>
- };
-}