[alsa-devel] [PATCH 1/1] ASoC: dwc: Use devm_ioremap_shared_resource

[Akshu Agrawal]

In the event when resgiters are same, this patch checks shared
flag and uses devm_ioremap_shared_resource for mapping. This allows
us to have 2 separate cpu dais for playback and capture having same
register set.

Signed-off-by: Akshu Agrawal <akshu.agrawal at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
---
 include/sound/designware_i2s.h |  1 +
 sound/soc/dwc/dwc-i2s.c        | 18 +++++++++++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/include/sound/designware_i2s.h b/include/sound/designware_i2s.h
index 830f5ca..a43a3708 100644
--- a/include/sound/designware_i2s.h
+++ b/include/sound/designware_i2s.h
@@ -56,6 +56,7 @@ struct i2s_platform_data {
 	void *capture_dma_data;
 	bool (*filter)(struct dma_chan *chan, void *slave);
 	int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
+	bool shared;
 };
 
 struct i2s_dma_data {
diff --git a/sound/soc/dwc/dwc-i2s.c b/sound/soc/dwc/dwc-i2s.c
index e27e21f..1e7c285 100644
--- a/sound/soc/dwc/dwc-i2s.c
+++ b/sound/soc/dwc/dwc-i2s.c
@@ -629,9 +629,21 @@ static int dw_i2s_probe(struct platform_device *pdev)
 	dw_i2s_dai->resume = dw_i2s_resume;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(dev->i2s_base))
-		return PTR_ERR(dev->i2s_base);
+	/* For devices which use the same registers for playback
+	 * and capture, we would set shared flag for registering
+	 * the second cpu dai.
+	 */
+	if (pdata && pdata->shared) {
+			dev->i2s_base =
+				devm_ioremap_shared_resource(&pdev->dev, res);
+			if (IS_ERR(dev->i2s_base))
+				return PTR_ERR(dev->i2s_base);
+	} else {
+			dev->i2s_base =
+				devm_ioremap_resource(&pdev->dev, res);
+			if (IS_ERR(dev->i2s_base))
+				return PTR_ERR(dev->i2s_base);
+	}
 
 	dev->dev = &pdev->dev;
 
-- 
1.9.1