[PATCH 04/20] ALSA: intel-nhlt: add helper to detect SSP link mask

[Takashi Iwai]

On Tue, 08 Mar 2022 20:25:54 +0100,
Pierre-Louis Bossart wrote:
> 
> The NHLT information can be used to figure out which SSPs are enabled
> in a platform.
> 
> The 'SSP' link type is too broad for machine drivers, since it can
> cover the Bluetooth sideband and the analog audio codec connections,
> so this helper exposes a parameter to filter with the device
> type (DEVICE_I2S refers to analog audio codec in NHLT parlance).
> 
> The helper returns a mask, since more than one SSP may be used for
> analog audio, e.g. the NHLT spec describes the use of SSP0 for
> amplifiers and SSP1 for headset codec. Note that if more than one bit
> is set, it's impossible to determine which SSP is connected to what
> external component. Additional platform-specific information based on
> e.g. DMI quirks would still be required in the machine driver to
> configure the relevant dailinks.
> 
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> Reviewed-by: Bard Liao <yung-chuan.liao at linux.intel.com>
> Reviewed-by: Péter Ujfalusi <peter.ujfalusi at linux.intel.com>

Acked-by: Takashi Iwai <tiwai at suse.de>


thanks,

Takashi