[PATCH v4 1/3] USB: chipidea: add imx usbmisc support

i.MX usb controllers shares non-core registers, which may include
SoC specific controls. We take it as a usbmisc device and usbmisc
driver set operations needed by ci13xxx_imx driver.

For example, Sabrelite board has bad over-current design, we can
usbmisc to disable over-current detect.

Signed-off-by: Richard Zhao <redacted>
---
 .../devicetree/bindings/usb/ci13xxx-imx.txt        |    5 +
 .../devicetree/bindings/usb/usbmisc-imx.txt        |   14 ++
 drivers/usb/chipidea/Makefile                      |    2 +-
 drivers/usb/chipidea/ci13xxx_imx.c                 |   64 ++++++++
 drivers/usb/chipidea/usbmisc_imx6q.c               |  162 ++++++++++++++++++++
 5 files changed, 246 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/usb/usbmisc-imx.txt
 create mode 100644 drivers/usb/chipidea/usbmisc_imx6q.c

diff --git a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
index 2c29041..5778b9c 100644
--- a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
+++ b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt

@@ -7,7 +7,10 @@ Required properties:
 
 Optional properties:
 - fsl,usbphy: phandler of usb phy that connects to the only one port
+- fsl,usbmisc: phandler of non-core register device, with one argument
+  that indicate usb controller index
 - vbus-supply: regulator for vbus
+- disable-over-current: disable over current detect
 
 Examples:
 usb at 02184000 { /* USB OTG */

@@ -15,4 +18,6 @@ usb at 02184000 { /* USB OTG */
 	reg = <0x02184000 0x200>;
 	interrupts = <0 43 0x04>;
 	fsl,usbphy = <&usbphy1>;
+	fsl,usbmisc = <&usbmisc 0>;
+	disable-over-current;
 };

diff --git a/Documentation/devicetree/bindings/usb/usbmisc-imx.txt b/Documentation/devicetree/bindings/usb/usbmisc-imx.txt
new file mode 100644
index 0000000..97ce94e
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usbmisc-imx.txt

@@ -0,0 +1,14 @@
+* Freescale i.MX non-core registers
+
+Required properties:
+- #index-cells: Cells used to descibe usb controller index. Should be <1>
+- compatible: Should be one of below:
+	"fsl,imx6q-usbmisc" for imx6q
+- reg: Should contain registers location and length
+
+Examples:
+usbmisc at 02184800 {
+	#index-cells = <1>;
+	compatible = "fsl,imx6q-usbmisc";
+	reg = <0x02184800 0x200>;
+};

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 5c66d9c..57e510f 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile

@@ -15,5 +15,5 @@ ifneq ($(CONFIG_PCI),)
 endif
 
 ifneq ($(CONFIG_OF_DEVICE),)
-	obj-$(CONFIG_USB_CHIPIDEA)	+= ci13xxx_imx.o
+	obj-$(CONFIG_USB_CHIPIDEA)	+= ci13xxx_imx.o usbmisc_imx6q.o
 endif

diff --git a/drivers/usb/chipidea/ci13xxx_imx.c b/drivers/usb/chipidea/ci13xxx_imx.c
index ef60d06..05cd0ae 100644
--- a/drivers/usb/chipidea/ci13xxx_imx.c
+++ b/drivers/usb/chipidea/ci13xxx_imx.c

@@ -22,6 +22,7 @@
 #include <linux/regulator/consumer.h>
 
 #include "ci.h"
+#include "ci13xxx_imx.h"
 
 #define pdev_to_phy(pdev) \
 	((struct usb_phy *)platform_get_drvdata(pdev))

@@ -34,6 +35,55 @@ struct ci13xxx_imx_data {
 	struct regulator *reg_vbus;
 };
 
+static const struct usbmisc_ops *usbmisc_ops;
+
+/* Common functions shared by usbmisc drivers */
+
+int usbmisc_set_ops(const struct usbmisc_ops *ops)
+{
+	if (usbmisc_ops)
+		return -EBUSY;
+
+	usbmisc_ops = ops;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbmisc_set_ops);
+
+void usbmisc_unset_ops(const struct usbmisc_ops *ops)
+{
+	usbmisc_ops = NULL;
+}
+EXPORT_SYMBOL_GPL(usbmisc_unset_ops);
+
+int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev)
+{
+	struct device_node *np = dev->of_node;
+	struct of_phandle_args args;
+	int ret;
+
+	usbdev->dev = dev;
+
+	ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
+					0, &args);
+	if (ret) {
+		dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
+			ret);
+		memset(usbdev, 0, sizeof(*usbdev));
+		return ret;
+	}
+	usbdev->index = args.args[0];
+	of_node_put(args.np);
+
+	if (of_find_property(np, "disable-over-current", NULL))
+		usbdev->disable_oc = 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbmisc_get_init_data);
+
+/* End of common functions shared by usbmisc drivers*/
+
 static struct ci13xxx_platform_data ci13xxx_imx_platdata __devinitdata  = {
 	.name			= "ci13xxx_imx",
 	.flags			= CI13XXX_REQUIRE_TRANSCEIVER |

@@ -51,6 +101,10 @@ static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
 	struct regulator *reg_vbus;
 	int ret;
 
+	if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL)
+		&& !usbmisc_ops)
+		return -EPROBE_DEFER;
+
 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data) {
 		dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n");

@@ -120,6 +174,16 @@ static int __devinit ci13xxx_imx_probe(struct platform_device *pdev)
 		*pdev->dev.dma_mask = DMA_BIT_MASK(32);
 		dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask);
 	}
+
+	if (usbmisc_ops && usbmisc_ops->init) {
+		ret = usbmisc_ops->init(&pdev->dev);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"usbmisc init failed, ret=%d\n", ret);
+			return ret;
+		}
+	}
+
 	plat_ci = ci13xxx_add_device(&pdev->dev,
 				pdev->resource, pdev->num_resources,
 				&ci13xxx_imx_platdata);

diff --git a/drivers/usb/chipidea/usbmisc_imx6q.c b/drivers/usb/chipidea/usbmisc_imx6q.c
new file mode 100644
index 0000000..416e3fc
--- /dev/null
+++ b/drivers/usb/chipidea/usbmisc_imx6q.c

@@ -0,0 +1,162 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include "ci13xxx_imx.h"
+
+#define USB_DEV_MAX 4
+
+#define BM_OVER_CUR_DIS		BIT(7)
+
+struct imx6q_usbmisc {
+	void __iomem *base;
+	spinlock_t lock;
+	struct clk *clk;
+	struct usbmisc_usb_device usbdev[USB_DEV_MAX];