On Thu, Jan 7, 2016 at 11:44 PM, Peter Chen <peter.chen@xxxxxxxxxxxxx> wrote: > Although most of USB devices are hot-plug's, there are still some devices > are hard wired on the board, eg, for HSIC and SSIC interface USB devices. > If these kinds of USB devices are multiple functions, and they can supply > other interfaces like i2c, gpios for other devices, we may need to > descirbe these at device tree. > > In this commit, it uses "reg" in dts as port number to match the port > number decided by USB core, if they are the same, then the device node > is for the device we are creating for USB core. > > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx> > --- > .../devicetree/bindings/usb/usb-device.txt | 8 ++++ > drivers/usb/core/Makefile | 2 +- > drivers/usb/core/of.c | 48 ++++++++++++++++++++++ > drivers/usb/core/usb.c | 8 +++- > include/linux/usb.h | 2 + > include/linux/usb/of.h | 6 +++ > 6 files changed, 71 insertions(+), 3 deletions(-) > create mode 100644 Documentation/devicetree/bindings/usb/usb-device.txt > create mode 100644 drivers/usb/core/of.c > > diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt > new file mode 100644 > index 0000000..d35facd > --- /dev/null > +++ b/Documentation/devicetree/bindings/usb/usb-device.txt > @@ -0,0 +1,8 @@ > +Generic USB Device Properties > + > +Usually, we only use device tree for hard wired USB device. > +The reference binding doc is from: > +http://playground.sun.com/1275/bindings/usb/usb-1_0.ps. This path doesn't exist anymore. Use http://www.firmware.org/1275/bindings/usb/usb-1_0.ps > + > +Required properties: > +- reg: the port number which this device is connecting to. At least compatible should also be here. > diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile > index 2f6f932..9780877 100644 > --- a/drivers/usb/core/Makefile > +++ b/drivers/usb/core/Makefile > @@ -5,7 +5,7 @@ > usbcore-y := usb.o hub.o hcd.o urb.o message.o driver.o > usbcore-y += config.o file.o buffer.o sysfs.o endpoint.o > usbcore-y += devio.o notify.o generic.o quirks.o devices.o > -usbcore-y += port.o > +usbcore-y += port.o of.o > > usbcore-$(CONFIG_PCI) += hcd-pci.o > usbcore-$(CONFIG_ACPI) += usb-acpi.o > diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c > new file mode 100644 > index 0000000..008ae6a > --- /dev/null > +++ b/drivers/usb/core/of.c > @@ -0,0 +1,48 @@ > +/* > + * of.c The helpers for hcd device tree support > + * > + * Copyright (C) 2016 Freescale Semiconductor, Inc. > + * Author: Peter Chen <peter.chen@xxxxxxxxxxxxx> > + * > + * This program is free software: you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 of > + * the License as published by the Free Software Foundation. > + * > + * 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. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/module.h> > +#include <linux/moduleparam.h> > +#include <linux/of.h> > + > +/** > + * usb_of_find_node - Find the device node match port number > + * @dev: the parent device node > + * @portnum: the port number which device is connecting > + * > + * Find the node from device tree according to its port number. > + * > + * Return: On success, a pointer to the device node, %NULL on failure. > + */ > +struct device_node *usb_of_find_node(struct device_node *parent, int portnum) > +{ > + struct device_node *node; > + u32 port; > + > + for_each_child_of_node(parent, node) { > + if (!of_property_read_u32(node, "reg", &port)) { > + if (port == portnum) > + return node; This needs to match on the compatible string too. Otherwise, this could match in lots of cases. > + } > + } > + > + return NULL; > +} > +EXPORT_SYMBOL_GPL(usb_of_find_node); > + -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
