| |
| Powerdown Controller (PDC) and SYS_WAKE inputs |
| ============================================== |
| |
| Implemented a PDC driver, primarily to handle the sys_wake input pins. It makes |
| a simple sys_wake interface available so that boards can set up the sys_wake |
| pins in the appropriate way. For example the bring up board has buttons wired up |
| to 3 of the sys_wake inputs, and one is configured as a wake button. They can |
| also be configured to call a callback function when they fire, or to cause the |
| watchdog to reset the system if they are held for several seconds. Additionally |
| each sys_wake's interrupt mode can be set. |
| |
| These capabilities would allow an input driver to be added for the buttons on |
| the bring up board so that userland can react to the button presses and choose |
| which ones should be able to wake the system. |
