ASoC: rsnd: Add Volume Ramp support
This patch adds Volume Ramp to Renesas sound driver. amixer set "DVC Out" 100% amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps" amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps" amixer set "DVC Out Ramp" on aplay xxx.wav & amixer set "DVC Out" 80% // Volume Down amixer set "DVC Out" 100% // Volume Up Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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