linux-kernel - [PATCH v5 10/14] ASoC: simple-card-utils: add asoc_simple_card_try_to_probe_graph

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Date:   Mon, 28 Nov 2016 02:47:39 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Rob Herring <robh+dt@...nel.org>, Mark Brown <broonie@...nel.org>
CC:     Linux-ALSA <alsa-devel@...a-project.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Simon <horms@...ge.net.au>,
        Laurent <laurent.pinchart@...asonboard.com>,
        Guennadi <g.liakhovetski@....de>,
        Grant Likely <grant.likely@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Linux-DT <devicetree@...r.kernel.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 10/14] ASoC: simple-card-utils: add asoc_simple_card_try_to_probe_graph_card()

From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

If CPU/Platform side driver probes successfully, and if it is supporting
both previous normal sound card style and graph style DT, it can call
asoc_simple_card_try_to_probe_graph_card().
It checks graph style DT, and do nothing if it was non graph style DT,
or register new simple-graph-card driver if graph style DT.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
 include/sound/simple_card_utils.h     |  2 ++
 sound/soc/generic/simple-card-utils.c | 42 +++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index c223f79..276e8e4 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -79,4 +79,6 @@ void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
 
 int asoc_simple_card_clean_reference(struct snd_soc_card *card);
 
+void asoc_simple_card_try_to_probe_graph_card(struct device *dev);
+
 #endif /* __SIMPLE_CARD_CORE_H */
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 527944d..fdf7d5e 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -8,6 +8,7 @@
  * published by the Free Software Foundation.
  */
 #include <linux/clk.h>
+#include <linux/dma-mapping.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
@@ -292,6 +293,47 @@ int asoc_simple_card_clean_reference(struct snd_soc_card *card)
 }
 EXPORT_SYMBOL_GPL(asoc_simple_card_clean_reference);
 
+void asoc_simple_card_try_to_probe_graph_card(struct device *dev)
+{
+	struct platform_device_info pdevinfo;
+	struct device_node *node;
+	const char *compatible;
+	int ret;
+
+	node = of_graph_get_top_port(dev);
+	if (!node)
+		/*
+		 * It doesn't have graph base sound DT.
+		 * Do nothing here, It assumes that system has
+		 * normal sound card.
+		 */
+		return;
+
+	ret = of_property_read_string(node, "compatible", &compatible);
+	if (ret < 0)
+		goto probe_err;
+
+	/*
+	 * FIXME
+	 *
+	 * It should use of_platform_xxx() instead of
+	 * platform_device_register_full() ? but there is no solution.
+	 * see also
+	 * linux/sound/soc/generic/simple-graph-card.c :: asoc_simple_card_probe
+	 */
+
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+	pdevinfo.parent		= dev;
+	pdevinfo.id		= PLATFORM_DEVID_AUTO;
+	pdevinfo.name		= compatible;
+	pdevinfo.dma_mask	= DMA_BIT_MASK(32);
+	platform_device_register_full(&pdevinfo);
+
+probe_err:
+	of_node_put(node);
+}
+EXPORT_SYMBOL_GPL(asoc_simple_card_try_to_probe_graph_card);
+
 /* Module information */
 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>");
 MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
-- 
1.9.1