linux-kernel - [PATCH] drivers: usb: dwc3 : Configure DMA properties and ops from DT

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Date:	Wed, 4 May 2016 09:11:58 +0530
From:	Rajesh Bhagat <rajesh.bhagat@....com>
To:	<linux-usb@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <balbi@...nel.org>,
	<gregkh@...uxfoundation.org>, <leoyang.li@....com>,
	<sriram.dash@....com>, Rajesh Bhagat <rajesh.bhagat@....com>
Subject: [PATCH] drivers: usb: dwc3 : Configure DMA properties and ops from DT

On certain platforms (e.g. ARM64) the dma_ops needs to be explicitly set
to be able to do DMA allocations, so use the of_dma_configure() helper
to populate the dma properties and assign an appropriate dma_ops.

Signed-off-by: Rajesh Bhagat <rajesh.bhagat@....com>
Reviewed-by: Yang-Leo Li <leoyang.li@....com>
---
 drivers/usb/dwc3/host.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index c679f63..4d5b783 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -17,6 +17,7 @@
 
 #include <linux/platform_device.h>
 #include <linux/usb/xhci_pdriver.h>
+#include <linux/of_device.h>
 
 #include "core.h"
 
@@ -32,6 +33,9 @@ int dwc3_host_init(struct dwc3 *dwc)
 		return -ENOMEM;
 	}
 
+	if (IS_ENABLED(CONFIG_OF) && dwc->dev->of_node)
+		of_dma_configure(&xhci->dev, dwc->dev->of_node);
+
 	dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
 
 	xhci->dev.parent	= dwc->dev;
-- 
2.6.2.198.g614a2ac