| 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>. |
