33 lines
1.1 KiB
Plaintext
Executable file
33 lines
1.1 KiB
Plaintext
Executable file
Rockchip RK3328 GRF (General Register Files) GPIO controller.
|
|
|
|
In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec mute
|
|
control, can also be used for general purpose. It is manipulated by the
|
|
GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI pins can
|
|
also be set in the same way.
|
|
|
|
Currently this GPIO controller only supports the mute pin. If needed in the
|
|
future, the HDMI pins support can also be added.
|
|
|
|
Required properties:
|
|
- compatible: Should contain "rockchip,rk3328-grf-gpio".
|
|
- gpio-controller: Marks the device node as a gpio controller.
|
|
- #gpio-cells: Should be 2. The first cell is the pin number and
|
|
the second cell is used to specify the gpio polarity:
|
|
0 = Active high,
|
|
1 = Active low.
|
|
|
|
Example:
|
|
|
|
grf: syscon@ff100000 {
|
|
compatible = "rockchip,rk3328-grf", "syscon", "simple-mfd";
|
|
|
|
grf_gpio: grf-gpio {
|
|
compatible = "rockchip,rk3328-grf-gpio";
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
};
|
|
};
|
|
|
|
Note: The grf_gpio node should be declared as the child of the GRF (General
|
|
Register File) node. The GPIO_MUTE pin is referred to as <&grf_gpio 0>.
|