ASoC: Remove platform field from snd_soc_dai

Typically a DAI does not need direct access to the platform. Currently the
only user of this field is in a platform driver where we have a more direct
way of getting a pointer to the platform. This patch updates the driver to
use the more direct way and then removes the platform field from the
snd_soc_dai struct.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -268,7 +268,6 @@ struct snd_soc_dai {
 	unsigned int sample_bits;
 
 	/* parent platform/codec */
-	struct snd_soc_platform *platform;
 	struct snd_soc_codec *codec;
 	struct snd_soc_component *component;
 

sound/soc/soc-core.c

@@ -1309,7 +1309,6 @@ static int soc_probe_link_dais(struct snd_soc_card *card, int num, int order)
 {
 	struct snd_soc_dai_link *dai_link = &card->dai_link[num];
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
-	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	int i, ret;
 
@@ -1317,7 +1316,6 @@ static int soc_probe_link_dais(struct snd_soc_card *card, int num, int order)
 			card->name, num, order);
 
 	/* config components */
-	cpu_dai->platform = platform;
 	cpu_dai->card = card;
 	for (i = 0; i < rtd->num_codecs; i++)
 		rtd->codec_dais[i]->card = card;

sound/soc/txx9/txx9aclc.c

@@ -292,7 +292,7 @@ static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 	struct snd_card *card = rtd->card->snd_card;
 	struct snd_soc_dai *dai = rtd->cpu_dai;
 	struct snd_pcm *pcm = rtd->pcm;
-	struct platform_device *pdev = to_platform_device(dai->platform->dev);
+	struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 	struct txx9aclc_soc_device *dev;
 	struct resource *r;
 	int i;