ASoC: SOF: sof-audio: add sof_dai_get_tdm_slots function

An new interface, sof_dai_get_tdm_slots(), is added for machine driver
to get tdm slot number from topology. The dai_get_param() callback
needs to support new parameter type SOF_DAI_PARAM_INTEL_SSP_TDM_SLOTS
by returning the tdm slot number of specific SSP port.
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240527193552.165567-14-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/sof.h

@@ -173,5 +173,6 @@ struct sof_dev_desc {
 
 int sof_dai_get_mclk(struct snd_soc_pcm_runtime *rtd);
 int sof_dai_get_bclk(struct snd_soc_pcm_runtime *rtd);
+int sof_dai_get_tdm_slots(struct snd_soc_pcm_runtime *rtd);
 
 #endif

sound/soc/sof/sof-audio.c

@@ -1016,3 +1016,13 @@ int sof_dai_get_bclk(struct snd_soc_pcm_runtime *rtd)
 	return sof_dai_get_param(rtd, SOF_DAI_PARAM_INTEL_SSP_BCLK);
 }
 EXPORT_SYMBOL(sof_dai_get_bclk);
+
+/*
+ * Helper to get SSP TDM slot number from a pcm_runtime.
+ * Return 0 if not exist.
+ */
+int sof_dai_get_tdm_slots(struct snd_soc_pcm_runtime *rtd)
+{
+	return sof_dai_get_param(rtd, SOF_DAI_PARAM_INTEL_SSP_TDM_SLOTS);
+}
+EXPORT_SYMBOL(sof_dai_get_tdm_slots);

sound/soc/sof/sof-audio.h

@@ -44,8 +44,9 @@
 #define WIDGET_IS_AIF_OR_DAI(id) (WIDGET_IS_DAI(id) || WIDGET_IS_AIF(id))
 #define WIDGET_IS_COPIER(id) (WIDGET_IS_AIF_OR_DAI(id) || (id) == snd_soc_dapm_buffer)
 
-#define SOF_DAI_PARAM_INTEL_SSP_MCLK	0
-#define SOF_DAI_PARAM_INTEL_SSP_BCLK	1
+#define SOF_DAI_PARAM_INTEL_SSP_MCLK		0
+#define SOF_DAI_PARAM_INTEL_SSP_BCLK		1
+#define SOF_DAI_PARAM_INTEL_SSP_TDM_SLOTS	2
 
 enum sof_widget_op {
 	SOF_WIDGET_PREPARE,