linux-kernel - [PATCH 1/3 v3] USB: ohci-exynos: Add support for device tree

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Date:	Mon, 16 Jul 2012 11:25:36 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	stern@...land.harvard.edu, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Cc:	l.majewski@...sung.com, a.kesavan@...sung.com,
	prashanth.g@...sung.com, kmpark@...radead.org, joshi@...sung.com,
	olofj@...gle.com, jg1.han@...sung.com, jy0922.shim@...sung.com,
	thomas.abraham@...aro.org, sshtylyov@...sta.com
Subject: [PATCH 1/3 v3] USB: ohci-exynos: Add support for device tree

This patch adds support to parse probe data for
ohci driver for exynos using device tree.

Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
Signed-off-by: Abhilash Kesavan <a.kesavan@...sung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>

diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index 8bcbdb5..fc3091b 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <mach/ohci.h>
 #include <plat/usb-phy.h>
@@ -71,6 +72,8 @@ static const struct hc_driver exynos_ohci_hc_driver = {
 	.start_port_reset	= ohci_start_port_reset,
 };
 
+static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
+
 static int __devinit exynos_ohci_probe(struct platform_device *pdev)
 {
 	struct exynos4_ohci_platdata *pdata;
@@ -87,6 +90,16 @@ static int __devinit exynos_ohci_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	/*
+	 * Right now device-tree probed devices don't get dma_mask set.
+	 * Since shared usb code relies on it, set it here for now.
+	 * Once we move to full device tree support this will vanish off.
+	 */
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &ohci_exynos_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
 	exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
 					GFP_KERNEL);
 	if (!exynos_ohci)
@@ -256,6 +269,14 @@ static const struct dev_pm_ops exynos_ohci_pm_ops = {
 	.resume		= exynos_ohci_resume,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ohci_match[] = {
+	{ .compatible = "samsung,exynos-ohci" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_ohci_match);
+#endif
+
 static struct platform_driver exynos_ohci_driver = {
 	.probe		= exynos_ohci_probe,
 	.remove		= __devexit_p(exynos_ohci_remove),
@@ -264,6 +285,7 @@ static struct platform_driver exynos_ohci_driver = {
 		.name	= "exynos-ohci",
 		.owner	= THIS_MODULE,
 		.pm	= &exynos_ohci_pm_ops,
+		.of_match_table	= of_match_ptr(exynos_ohci_match),
 	}
 };
 
-- 
1.7.0.4

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