On Tue, Sep 27, 2011 at 11:08:48AM +0200, Lars-Peter Clausen wrote:
Currently the oscillator is always enabled and the clock output is always disabled. This patch adds support for controlling the oscillator and clock output state through snd_soc_dai_set_sysclk. Which makes it possible to disable or enable them dynamically according to the requirements of the board on which the CODEC is used.
This patch also slightly modifies the behavior as to when the oscillator is going to be disabled in low-power states. Previously it would only be disabled in BIAS_OFF, now it is also going to be disabled in BIAS_STANDBY, since no components which depend on it should be active in this state.
Is this last assumption actually true? Things like accessory detect can need clocks on devices even when they're idle from an audio point of view. Still, I've applied the patch - we can always fix up later if something needs the clock enabling.