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    Subject[RFC PATCH 2/7] ASoC: sunxi: sun4i-i2s: Use channel-dins device tree property
    Date
    Instead of using DIN pin 0 for all pins, allow changing this using
    the device tree property.

    As an example:

    &i2s2 {
    channel-dins = /bits/ 8 <0 0 1 1 2 2>;
    };

    This sets channels 0 and 1 to DIN pin 0, channels 1 and 2 to DIN pin 1,
    and channels 3 and 4 to DIN pin 3 respectively.

    Signed-off-by: John Watts <contact@jookia.org>
    ---
    sound/soc/sunxi/sun4i-i2s.c | 25 +++++++++++++++++++++++++
    1 file changed, 25 insertions(+)

    diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
    index d8f999ecaf05..cf66f21646a4 100644
    --- a/sound/soc/sunxi/sun4i-i2s.c
    +++ b/sound/soc/sunxi/sun4i-i2s.c
    @@ -236,8 +236,33 @@ struct sun4i_i2s_clk_div {

    static int sun4i_i2s_read_channel_dins(struct device *dev, struct sun4i_i2s *i2s)
    {
    + struct device_node *np = dev->of_node;
    + int max_channels = ARRAY_SIZE(i2s->channel_dins);
    + int ret;
    +
    /* Use DIN pin 0 by default */
    memset(i2s->channel_dins, 0, sizeof(i2s->channel_dins));
    +
    + if (!np)
    + return 0;
    +
    + ret = of_property_read_variable_u8_array(np, "channel-dins",
    + i2s->channel_dins,
    + 1, max_channels);
    +
    + if (ret == -EINVAL)
    + return 0;
    +
    + if (ret < 0)
    + return ret;
    +
    + for (int i = 0; i < ret; ++i) {
    + u8 din = i2s->channel_dins[i];
    +
    + if (din >= i2s->variant->num_din_pins)
    + return -EINVAL;
    + }
    +
    return 0;
    }

    --
    2.41.0
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