ASoC: simple-card-utils: Unify clock direction by clk_direction

Original sample-card assumes SND_SOC_CLOCK_IN is used for
snd_soc_dai_set_sysclk(), but someday, Codec uses SND_SOC_CLOCK_IN
and CPU uses SND_SOC_CLOCK_OUT at hw_params(), and dai->clk_direction
is used at simple_init_dai().

There is no uniformity today. Let's use dai->clk_direction for all cases.

Fortunately, almost all DAI doesn't care about "dir"
(= SND_SOC_CLOCK_IN/OUT) in .set_sysclk callback function (which is called
in snd_soc_dai_set_sysclk()), so this patch has no effect in such DAIs.

But this patch might breaks some existing Sound Card. Use
"system-clock-direction-out" property if it needs to use SND_SOC_CLOCK_OUT

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87y10lu0gx.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/simple-card-utils.c

@@ -365,17 +365,15 @@ void simple_util_shutdown(struct snd_pcm_substream *substream)
 		struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, i);
 
 		if (props->mclk_fs && !dai->clk_fixed && !snd_soc_dai_active(cpu_dai))
-			snd_soc_dai_set_sysclk(cpu_dai,
-					       0, 0, SND_SOC_CLOCK_OUT);
+			snd_soc_dai_set_sysclk(cpu_dai, 0, 0, dai->clk_direction);
 
 		simple_clk_disable(dai);
 	}
 	for_each_prop_dai_codec(props, i, dai) {
 		struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, i);
 
 		if (props->mclk_fs && !dai->clk_fixed && !snd_soc_dai_active(codec_dai))
-			snd_soc_dai_set_sysclk(codec_dai,
-					       0, 0, SND_SOC_CLOCK_IN);
+			snd_soc_dai_set_sysclk(codec_dai, 0, 0, dai->clk_direction);
 
 		simple_clk_disable(dai);
 	}
@@ -483,13 +481,15 @@ int simple_util_hw_params(struct snd_pcm_substream *substream,
 		}
 
 		for_each_rtd_codec_dais(rtd, i, sdai) {
-			ret = snd_soc_dai_set_sysclk(sdai, 0, mclk, SND_SOC_CLOCK_IN);
+			pdai = simple_props_to_dai_codec(props, i);
+			ret = snd_soc_dai_set_sysclk(sdai, 0, mclk, pdai->clk_direction);
 			if (ret && ret != -ENOTSUPP)
 				return ret;
 		}
 
 		for_each_rtd_cpu_dais(rtd, i, sdai) {
-			ret = snd_soc_dai_set_sysclk(sdai, 0, mclk, SND_SOC_CLOCK_OUT);
+			pdai = simple_props_to_dai_cpu(props, i);
+			ret = snd_soc_dai_set_sysclk(sdai, 0, mclk, pdai->clk_direction);
 			if (ret && ret != -ENOTSUPP)
 				return ret;
 		}