| Hans Verkuil | 67f2a06 | 2017-08-02 03:22:33 -0400 | [diff] [blame] | 1 | * HDMI CEC GPIO driver |
| 2 | |
| 3 | The HDMI CEC GPIO module supports CEC implementations where the CEC line |
| 4 | is hooked up to a pull-up GPIO line and - optionally - the HPD line is |
| 5 | hooked up to another GPIO line. |
| 6 | |
| 7 | Required properties: |
| 8 | - compatible: value must be "cec-gpio". |
| 9 | - cec-gpios: gpio that the CEC line is connected to. The line should be |
| 10 | tagged as open drain. |
| 11 | |
| 12 | If the CEC line is associated with an HDMI receiver/transmitter, then the |
| 13 | following property is also required: |
| 14 | |
| 15 | - hdmi-phandle - phandle to the HDMI controller, see also cec.txt. |
| 16 | |
| 17 | If the CEC line is not associated with an HDMI receiver/transmitter, then |
| 18 | the following property is optional: |
| 19 | |
| 20 | - hpd-gpios: gpio that the HPD line is connected to. |
| 21 | |
| 22 | Example for the Raspberry Pi 3 where the CEC line is connected to |
| 23 | pin 26 aka BCM7 aka CE1 on the GPIO pin header and the HPD line is |
| 24 | connected to pin 11 aka BCM17: |
| 25 | |
| 26 | #include <dt-bindings/gpio/gpio.h> |
| 27 | |
| 28 | cec-gpio { |
| 29 | compatible = "cec-gpio"; |
| 30 | cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>; |
| 31 | hpd-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>; |
| 32 | }; |