f8f8d87cd9
The pwm and pwmbus interfaces were nearly identical, this merges them into a single pwmbus interface. The pwmbus driver now implements the pwmbus interface by simply passing all calls through to its parent (the hardware driver). The channel_count method moves from pwm to pwmbus, and the get_bus method is deleted (just no longer needed). The net effect is that the interface for doing pwm stuff is now the same regardless of whether you're a child of pwmbus, or some random driver elsewhere in the hierarchy that is bypassing the pwmbus layer and is talking directly to the hardware driver via cross-hierarchy connections established using fdt data. The pwmc driver is now a child of pwmbus, instead of being its sibling (that's why the get_bus method is no longer needed; pwmc now gets the device_t of the bus using device_get_parent()).
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