[V4 PATCH 24/26] usb: gadget: mv_udc: add device tree support

[Chao Xie]

In original driver, we have callbacks in platform data, and some
dynamically allocations variables in platform data.
Now, these blocks are removed, the device tree support is easier
now.

Signed-off-by: Chao Xie <chao.xie at marvell.com>
---
 drivers/usb/gadget/mv_udc.h      |    5 +-
 drivers/usb/gadget/mv_udc_core.c |  106 ++++++++++++++++++++++++++++++--------
 2 files changed, 86 insertions(+), 25 deletions(-)

diff --git a/drivers/usb/gadget/mv_udc.h b/drivers/usb/gadget/mv_udc.h
index 50ae7c7..de84722 100644
--- a/drivers/usb/gadget/mv_udc.h
+++ b/drivers/usb/gadget/mv_udc.h
@@ -179,6 +179,7 @@ struct mv_udc {
 	int				irq;
 
 	unsigned int			extern_attr;
+	unsigned int			mode;
 	struct notifier_block		notifier;
 
 	struct mv_cap_regs __iomem	*cap_regs;
@@ -222,11 +223,9 @@ struct mv_udc {
 	struct mv_usb2_phy	*phy;
 	struct usb_phy		*transceiver;
 
-	struct mv_usb_platform_data     *pdata;
-
 	/* some SOC has mutiple clock sources for USB*/
 	unsigned int    clknum;
-	struct clk      *clk[0];
+	struct clk      **clk;
 };
 
 /* endpoint data structure */
diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index 4b50334..42eba77 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -34,6 +34,7 @@
 #include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/of.h>
 #include <linux/platform_data/mv_usb.h>
 #include <linux/usb/mv_usb2.h>
 #include <asm/unaligned.h>
@@ -2153,21 +2154,57 @@ static int mv_udc_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int mv_udc_parse_dt(struct platform_device *pdev,
+				struct mv_udc *udc)
+{
+	struct device_node *np = pdev->dev.of_node;
+	unsigned int clks_num;
+	int i, ret;
+	const char *clk_name;
+
+	if (!np)
+		return 1;
+
+	clks_num = of_property_count_strings(np, "clocks");
+	if (clks_num < 0)
+		return clks_num;
+
+	udc->clk = devm_kzalloc(&pdev->dev,
+		sizeof(struct clk *) * clks_num, GFP_KERNEL);
+	if (udc->clk == NULL)
+		return -ENOMEM;
+
+	for (i = 0; i < clks_num; i++) {
+		ret = of_property_read_string_index(np, "clocks", i,
+			&clk_name);
+		if (ret)
+			return ret;
+		udc->clk[i] = devm_clk_get(&pdev->dev, clk_name);
+		if (IS_ERR(udc->clk[i]))
+			return PTR_ERR(udc->clk[i]);
+	}
+
+	udc->clknum = clks_num;
+
+	ret = of_property_read_u32(np, "extern_attr", &udc->extern_attr);
+	if (ret)
+		return ret;
+
+	ret = of_property_read_u32(np, "mode", &udc->mode);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static int mv_udc_probe(struct platform_device *pdev)
 {
-	struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
 	struct mv_udc *udc;
 	int retval = 0;
-	int clk_i = 0;
 	struct resource *r;
 	size_t size;
 
-	if (pdata == NULL) {
-		dev_err(&pdev->dev, "missing platform_data\n");
-		return -ENODEV;
-	}
-
-	size = sizeof(*udc) + sizeof(struct clk *) * pdata->clknum;
+	size = sizeof(*udc);
 	udc = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 	if (udc == NULL) {
 		dev_err(&pdev->dev, "failed to allocate memory for udc\n");
@@ -2175,14 +2212,43 @@ static int mv_udc_probe(struct platform_device *pdev)
 	}
 
 	udc->done = &release_done;
-	udc->extern_attr = pdata->extern_attr;
-	udc->pdata = pdev->dev.platform_data;
 	spin_lock_init(&udc->lock);
 
 	udc->dev = pdev;
 
+	retval = mv_udc_parse_dt(pdev, udc);
+	if (retval > 0) {
+		/* no CONFIG_OF */
+		struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
+		int clk_i = 0;
+
+		if (pdata == NULL) {
+			dev_err(&pdev->dev, "missing platform_data\n");
+			return -ENODEV;
+		}
+		udc->extern_attr = pdata->extern_attr;
+		udc->mode = pdata->mode;
+		udc->clknum = pdata->clknum;
+
+		size = sizeof(struct clk *) * udc->clknum;
+		udc->clk = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+		if (udc->clk == NULL)
+			return -ENOMEM;
+		for (clk_i = 0; clk_i < udc->clknum; clk_i++) {
+			udc->clk[clk_i] = devm_clk_get(&pdev->dev,
+						pdata->clkname[clk_i]);
+			if (IS_ERR(udc->clk[clk_i])) {
+				retval = PTR_ERR(udc->clk[clk_i]);
+				return retval;
+			}
+		}
+	} else if (retval < 0) {
+		dev_err(&pdev->dev, "error parse dt\n");
+		return retval;
+	}
+
 #ifdef CONFIG_USB_OTG_UTILS
-	if (pdata->mode == MV_USB_MODE_OTG) {
+	if (udc->mode == MV_USB_MODE_OTG) {
 		udc->transceiver = devm_usb_get_phy(&pdev->dev,
 					USB_PHY_TYPE_USB2);
 		if (IS_ERR_OR_NULL(udc->transceiver)) {
@@ -2191,17 +2257,6 @@ static int mv_udc_probe(struct platform_device *pdev)
 		}
 	}
 #endif
-
-	udc->clknum = pdata->clknum;
-	for (clk_i = 0; clk_i < udc->clknum; clk_i++) {
-		udc->clk[clk_i] = devm_clk_get(&pdev->dev,
-					pdata->clkname[clk_i]);
-		if (IS_ERR(udc->clk[clk_i])) {
-			retval = PTR_ERR(udc->clk[clk_i]);
-			return retval;
-		}
-	}
-
 	r = platform_get_resource(udc->dev, IORESOURCE_MEM, 0);
 	if (r == NULL) {
 		dev_err(&pdev->dev, "no I/O memory resource defined\n");
@@ -2466,6 +2521,12 @@ static void mv_udc_shutdown(struct platform_device *pdev)
 	mv_udc_disable(udc);
 }
 
+static struct of_device_id mv_udc_dt_ids[] = {
+	{ .compatible = "mrvl,mv-udc" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mv_udc_dt_ids);
+
 static struct platform_driver udc_driver = {
 	.probe		= mv_udc_probe,
 	.remove		= mv_udc_remove,
@@ -2476,6 +2537,7 @@ static struct platform_driver udc_driver = {
 #ifdef CONFIG_PM
 		.pm	= &mv_udc_pm_ops,
 #endif
+		.of_match_table = mv_udc_dt_ids,
 	},
 };
 
-- 
1.7.4.1