Unverified Commit 1b839d3e authored Aug 26, 2020 by Stephan Gerhold Committed by Mark Brown Sep 08, 2020

ASoC: qcom: common: Parse auxiliary devices from device tree



In some cases we need to probe additional audio components that do
not appear as part of the DAI links specified in the device tree.
Examples for this are auxiliary devices such as analog amplifiers
or codecs.

The ASoC core provides a way to probe these components by adding
them to snd_soc_card->aux_dev. We can use the snd_soc_of_parse_aux_devs()
function to parse them from the device tree.

As an example for this, some MSM8916 smartphones have an analog
speaker amplifier connected to the HPHR output. With the new property
this can be modelled as follows:

	speaker-amp: audio-amplifier {
		compatible = "simple-audio-amplifier";
		enable-gpios = <&msmgpio 114 GPIO_ACTIVE_HIGH>;
		sound-name-prefix = "Speaker Amp";
	};

	&sound {
		aux-devs = <&speaker_amp>;
		audio-routing = "Speaker Amp IN", "HPHR";
	};

Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200826095141.94017-3-stephan@gerhold.net


Signed-off-by: Mark Brown <broonie@kernel.org>

parent cdd3b8da

sound/soc/qcom/common.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -39,6 +39,10 @@ int qcom_snd_parse_of(struct snd_soc_card *card)
		return ret;
		}

		ret = snd_soc_of_parse_aux_devs(card, "aux-devs");
		if (ret)
		return ret;

		/* Populate links */
		num_links = of_get_child_count(dev->of_node);

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