[RFC 03/13] ASoC: Intel: avs: Parse module-extension tuples

[Pierre-Louis Bossart]

> +struct avs_tplg_modcfg_ext {
> +	guid_t type;
> +
> +	union {
> +		struct {
> +			u16 num_input_pins;
> +			u16 num_output_pins;
> +			struct avs_tplg_pin_format *pin_fmts;
> +		} generic;
> +		struct {
> +			struct avs_audio_format *out_fmt;
> +			struct avs_audio_format *blob_fmt; /* optional override */
> +			u32 feature_mask;
> +			union avs_virtual_index vindex;
> +			u32 dma_type;
> +			u32 dma_buffer_size;
> +			u32 config_length;
> +			/* config_data part of priv data */
> +		} copier;
> +		struct {
> +			u32 out_channel_config;
> +			u32 coefficients_select;
> +			s32 coefficients[AVS_CHANNELS_MAX];
> +			u32 channel_map;
> +		} updown_mix;
> +		struct {
> +			u32 out_freq;
> +		} src;
> +		struct {
> +			u32 out_freq;
> +			u8 mode;
> +			u8 disable_jitter_buffer;
> +		} asrc;
> +		struct {
> +			u32 cpc_lp_mode;
> +		} wov;
> +		struct {
> +			struct avs_audio_format *ref_fmt;
> +			struct avs_audio_format *out_fmt;
> +			u32 cpc_lp_mode;
> +		} aec;
> +		struct {
> +			struct avs_audio_format *ref_fmt;
> +			struct avs_audio_format *out_fmt;
> +		} mux;
> +		struct {
> +			struct avs_audio_format *out_fmt;
> +		} micsel;
> +	};
> +};

I am struggling to reconcile the notion of 'extension' with a fixed
structure that deals with Intel-specific modules.

How would a 3rd party add their own modules and expose parameters/tokens
through the topology?