ASoC: simple-mux: add read function
During initialisation DAPM tries to read the state of the MUX being connected, resulting in this error log: input-mux: ASoC: error at soc_component_read_no_lock on input-mux: -5 Provide a read function which allows DAPM to read the state of the MUX. Signed-off-by: Maarten Zanders <maarten.zanders@mind.be> Link: https://lore.kernel.org/r/20221028191303.166115-1-maarten.zanders@mind.beSigned-off-by: Mark Brown <broonie@kernel.org>
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