ASoC: codecs: ak4619: Add optional powerdown GPIO

Add optional device tree binding that enables operation of the 'PDN' pin
during initialization:

    codec@10 {
        compatible = "asahi-kasei,ak4619";
        reg = <0x10>;
        powerdown-gpios = <&gpio1 0 GPIO_ACTIVE_LOW>;  // <--
        #sound-dai-cells = <0>;
    };

If defined, PDN is set high during driver probe, followed by a 10 ms
delay as required before first register access [1].

If no 'powerdown-gpios' is defined, the behaviour is unchanged.

[1] AK4619 datasheet, sec. 2 'Power-up/down Sequence', page 39

Signed-off-by: Alexander Koch <mail@alexanderkoch.net>
Link: https://patch.msgid.link/20260929090821.1476257-2-mail@alexanderkoch.net
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions