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    Subject[PATCH 4/5] ASoC: meson: axg-card: add basic codec-to-codec link support
    Date
    Add basic support for codec-to-codec link in the axg sound card.
    The cpu side of these links is expected to properly set the hw_params
    and format of the link.

    ATM, only the tohdmitx glue is supported but others (like the
    internal DAC glue) should follow.

    Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
    ---
    sound/soc/meson/axg-card.c | 19 +++++++++++++++++++
    1 file changed, 19 insertions(+)

    diff --git a/sound/soc/meson/axg-card.c b/sound/soc/meson/axg-card.c
    index 5c8deee8d512..db0a7fc18928 100644
    --- a/sound/soc/meson/axg-card.c
    +++ b/sound/soc/meson/axg-card.c
    @@ -29,6 +29,18 @@ struct axg_dai_link_tdm_data {
    struct axg_dai_link_tdm_mask *codec_masks;
    };

    +/*
    + * Base params for the codec to codec links
    + * Those will be over-written by the CPU side of the link
    + */
    +static const struct snd_soc_pcm_stream codec_params = {
    + .formats = SNDRV_PCM_FMTBIT_S24_LE,
    + .rate_min = 5525,
    + .rate_max = 192000,
    + .channels_min = 1,
    + .channels_max = 8,
    +};
    +
    #define PREFIX "amlogic,"

    static int axg_card_reallocate_links(struct axg_card *priv,
    @@ -517,6 +529,11 @@ static int axg_card_cpu_is_tdm_iface(struct device_node *np)
    return of_device_is_compatible(np, PREFIX "axg-tdm-iface");
    }

    +static int axg_card_cpu_is_codec(struct device_node *np)
    +{
    + return of_device_is_compatible(np, PREFIX "g12a-tohdmitx");
    +}
    +
    static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
    int *index)
    {
    @@ -540,6 +557,8 @@ static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,

    if (axg_card_cpu_is_tdm_iface(dai_link->cpu_of_node))
    ret = axg_card_parse_tdm(card, np, index);
    + else if (axg_card_cpu_is_codec(dai_link->cpu_of_node))
    + dai_link->params = &codec_params;

    return ret;
    }
    --
    2.20.1
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