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diff --git a/Documentation/sound/alsa/soc/platform.txt b/Documentation/sound/alsa/soc/platform.txt
deleted file mode 100644
index 3a08a2c9150c..000000000000
--- a/Documentation/sound/alsa/soc/platform.txt
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@@ -1,79 +0,0 @@
-ASoC Platform Driver
-====================
-
-An ASoC platform driver class can be divided into audio DMA drivers, SoC DAI
-drivers and DSP drivers. The platform drivers only target the SoC CPU and must
-have no board specific code.
-
-Audio DMA
-=========
-
-The platform DMA driver optionally supports the following ALSA operations:-
-
-/* SoC audio ops */
-struct snd_soc_ops {
-	int (*startup)(struct snd_pcm_substream *);
-	void (*shutdown)(struct snd_pcm_substream *);
-	int (*hw_params)(struct snd_pcm_substream *, struct snd_pcm_hw_params *);
-	int (*hw_free)(struct snd_pcm_substream *);
-	int (*prepare)(struct snd_pcm_substream *);
-	int (*trigger)(struct snd_pcm_substream *, int);
-};
-
-The platform driver exports its DMA functionality via struct
-snd_soc_platform_driver:-
-
-struct snd_soc_platform_driver {
-	char *name;
-
-	int (*probe)(struct platform_device *pdev);
-	int (*remove)(struct platform_device *pdev);
-	int (*suspend)(struct platform_device *pdev, struct snd_soc_cpu_dai *cpu_dai);
-	int (*resume)(struct platform_device *pdev, struct snd_soc_cpu_dai *cpu_dai);
-
-	/* pcm creation and destruction */
-	int (*pcm_new)(struct snd_card *, struct snd_soc_codec_dai *, struct snd_pcm *);
-	void (*pcm_free)(struct snd_pcm *);
-
-	/*
-	 * For platform caused delay reporting.
-	 * Optional.
-	 */
-	snd_pcm_sframes_t (*delay)(struct snd_pcm_substream *,
-		struct snd_soc_dai *);
-
-	/* platform stream ops */
-	struct snd_pcm_ops *pcm_ops;
-};
-
-Please refer to the ALSA driver documentation for details of audio DMA.
-http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
-
-An example DMA driver is soc/pxa/pxa2xx-pcm.c
-
-
-SoC DAI Drivers
-===============
-
-Each SoC DAI driver must provide the following features:-
-
- 1) Digital audio interface (DAI) description
- 2) Digital audio interface configuration
- 3) PCM's description
- 4) SYSCLK configuration
- 5) Suspend and resume (optional)
-
-Please see codec.txt for a description of items 1 - 4.
-
-
-SoC DSP Drivers
-===============
-
-Each SoC DSP driver usually supplies the following features :-
-
- 1) DAPM graph
- 2) Mixer controls
- 3) DMA IO to/from DSP buffers (if applicable)
- 4) Definition of DSP front end (FE) PCM devices.
-
-Please see DPCM.txt for a description of item 4.