[alsa-devel] [PATCHv6 2/2] ASoC: TWL6040: Add twl6040 codec driver
lrg at slimlogic.co.uk
Thu Mar 18 09:43:48 CET 2010
On Wed, 2010-03-17 at 17:42 -0500, Olaya, Margarita wrote:
> From: Misael Lopez Cruz <x0052729 at ti.com>
> Initial version of TWL6040 codec driver.
> The TWL6040 codec uses a proprietary PDM-based digital audio interface.
> Audio paths supported are:
> - Input: Main Mic, Sub Mic, Headset Mic, Auxiliary-FM Left/Right
> - Output: Headset Left/Right, Handsfree Left/Right
> TWL6040 codec supports power-up/down manual and automatic sequence.
> Manual sequence is done through a specific register writes sequence.
> Automatic sequence is done when the codec is powered-up through the
> external AUDPWRON line. The completion of the sequence is signaled
> through the audio interrupt.
> TWL6040 codec sysclk can be provided by: low-power or high
> performance PLL:
> - The low-power PLL takes a low-frequency input at 32,768 Hz and
> generates an approximate of 17.64 or 19.2 MHz (for 44.1 KHz and 48 KHz
> - The high-performance PLL generates an exact 19.2 MHz clock signal
> from high-frequency input at 12/19.2/26/38.4 MHz.
> Low-power playback mode is a special scenario where only headset path
> (headset DAC and driver) is active.
> For the particular case of headset path, PLL being used defines the
> headset power mode: low-power, high-performance.
> Signed-off-by: Misael Lopez Cruz <x0052729 at ti.com>
> Signed-off-by: Jorge Eduardo Candelaria <jorge.candelaria at ti.com>
> Signed-off-by: Margarita Olaya Cabrera <magi.olaya at ti.com>
Acked-by: Liam Girdwood <lrg at slimlogic.co.uk>
Freelance Developer, SlimLogic Ltd
ASoC and Voltage Regulator Maintainer.
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