drivers: bus: add a new driver for omap-ocp2scp

Adds a new driver *omap-ocp2scp*. This driver takes the responsibility of
creating all the devices that is connected to OCP2SCP. In the case of OMAP4,
USB2PHY is connected to ocp2scp.

This also includes device tree support for ocp2scp driver and
the documentation with device tree binding information is updated.
Acked-by: Felipe Balbi <balbi@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/bus/omap-ocp2scp.txt

+* OMAP OCP2SCP - ocp interface to scp interface
+
+properties:
+- compatible : Should be "ti,omap-ocp2scp"
+- #address-cells, #size-cells : Must be present if the device has sub-nodes
+- ranges : the child address space are mapped 1:1 onto the parent address space
+- ti,hwmods : must be "ocp2scp_usb_phy"
+
+Sub-nodes:
+All the devices connected to ocp2scp are described using sub-node to ocp2scp

drivers/Kconfig

@@ -2,6 +2,8 @@ menu "Device Drivers"
 
 source "drivers/base/Kconfig"
 
+source "drivers/bus/Kconfig"
+
 source "drivers/connector/Kconfig"
 
 source "drivers/mtd/Kconfig"

drivers/Makefile

@@ -5,6 +5,8 @@
 # Rewritten to use lists instead of if-statements.
 #
 
+obj-y				+= bus/
+
 # GPIO must come after pinctrl as gpios may need to mux pins etc
 obj-y				+= pinctrl/
 obj-y				+= gpio/

drivers/bus/Kconfig

+#
+# Bus Devices
+#
+
+menu "Bus devices"
+
+config OMAP_OCP2SCP
+	tristate "OMAP OCP2SCP DRIVER"
+	help
+	  Driver to enable ocp2scp module which transforms ocp interface
+	  protocol to scp protocol. In OMAP4, USB PHY is connected via
+	  OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
+	  OCP2SCP.
+
+endmenu

drivers/bus/Makefile

+#
+# Makefile for the bus drivers.
+#
+
+obj-$(CONFIG_OMAP_OCP2SCP)	+= omap-ocp2scp.o

drivers/bus/omap-ocp2scp.c

+/*
+ * omap-ocp2scp.c - transform ocp interface protocol to scp protocol
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+static int ocp2scp_remove_devices(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
+static int __devinit omap_ocp2scp_probe(struct platform_device *pdev)
+{
+	int			ret;
+	struct device_node	*np = pdev->dev.of_node;
+
+	if (np) {
+		ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to add resources for ocp2scp child\n");
+			goto err0;
+		}
+	}
+	pm_runtime_enable(&pdev->dev);
+
+	return 0;
+
+err0:
+	device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
+
+	return ret;
+}
+
+static int __devexit omap_ocp2scp_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+	device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id omap_ocp2scp_id_table[] = {
+	{ .compatible = "ti,omap-ocp2scp" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
+#endif
+
+static struct platform_driver omap_ocp2scp_driver = {
+	.probe		= omap_ocp2scp_probe,
+	.remove		= __devexit_p(omap_ocp2scp_remove),
+	.driver		= {
+		.name	= "omap-ocp2scp",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(omap_ocp2scp_id_table),
+	},
+};
+
+module_platform_driver(omap_ocp2scp_driver);
+
+MODULE_ALIAS("platform: omap-ocp2scp");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_DESCRIPTION("OMAP OCP2SCP driver");
+MODULE_LICENSE("GPL v2");