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179 lines
5.7 KiB
179 lines
5.7 KiB
From 69bec725985324e79b1c47ea287815ac4ddb0521 Mon Sep 17 00:00:00 2001
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From: Peter Chen <peter.chen@freescale.com>
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Date: Fri, 19 Feb 2016 17:26:15 +0800
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Subject: [PATCH] USB: core: let USB device know device node
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Although most of USB devices are hot-plug's, there are still some devices
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are hard wired on the board, eg, for HSIC and SSIC interface USB devices.
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If these kinds of USB devices are multiple functions, and they can supply
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other interfaces like i2c, gpios for other devices, we may need to
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describe these at device tree.
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In this commit, it uses "reg" in dts as physical port number to match
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the phyiscal port number decided by USB core, if they are the same,
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then the device node is for the device we are creating for USB core.
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Signed-off-by: Peter Chen <peter.chen@freescale.com>
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Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
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Acked-by: Alan Stern <stern@rowland.harvard.edu>
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Acked-by: Rob Herring <robh@kernel.org>
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Acked-by: Arnd Bergmann <arnd@arndb.de>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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.../devicetree/bindings/usb/usb-device.txt | 28 +++++++++++++
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drivers/usb/core/Makefile | 2 +-
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drivers/usb/core/of.c | 47 ++++++++++++++++++++++
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drivers/usb/core/usb.c | 10 +++++
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include/linux/usb/of.h | 7 ++++
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5 files changed, 93 insertions(+), 1 deletion(-)
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create mode 100644 Documentation/devicetree/bindings/usb/usb-device.txt
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create mode 100644 drivers/usb/core/of.c
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/usb/usb-device.txt
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@@ -0,0 +1,28 @@
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+Generic USB Device Properties
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+
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+Usually, we only use device tree for hard wired USB device.
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+The reference binding doc is from:
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+http://www.firmware.org/1275/bindings/usb/usb-1_0.ps
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+
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+Required properties:
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+- compatible: usbVID,PID. The textual representation of VID, PID shall
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+ be in lower case hexadecimal with leading zeroes suppressed. The
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+ other compatible strings from the above standard binding could also
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+ be used, but a device adhering to this binding may leave out all except
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+ for usbVID,PID.
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+- reg: the port number which this device is connecting to, the range
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+ is 1-31.
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+
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+Example:
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+
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+&usb1 {
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+ status = "okay";
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+
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ hub: genesys@1 {
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+ compatible = "usb5e3,608";
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+ reg = <1>;
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+ };
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+}
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--- a/drivers/usb/core/Makefile
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+++ b/drivers/usb/core/Makefile
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@@ -5,7 +5,7 @@
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usbcore-y := usb.o hub.o hcd.o urb.o message.o driver.o
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usbcore-y += config.o file.o buffer.o sysfs.o endpoint.o
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usbcore-y += devio.o notify.o generic.o quirks.o devices.o
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-usbcore-y += port.o
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+usbcore-y += port.o of.o
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usbcore-$(CONFIG_PCI) += hcd-pci.o
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usbcore-$(CONFIG_ACPI) += usb-acpi.o
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--- /dev/null
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+++ b/drivers/usb/core/of.c
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@@ -0,0 +1,47 @@
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+/*
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+ * of.c The helpers for hcd device tree support
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+ *
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+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
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+ * Author: Peter Chen <peter.chen@freescale.com>
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 of
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+ * the License as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <linux/of.h>
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+
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+/**
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+ * usb_of_get_child_node - Find the device node match port number
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+ * @parent: the parent device node
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+ * @portnum: the port number which device is connecting
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+ *
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+ * Find the node from device tree according to its port number.
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+ *
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+ * Return: On success, a pointer to the device node, %NULL on failure.
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+ */
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+struct device_node *usb_of_get_child_node(struct device_node *parent,
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+ int portnum)
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+{
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+ struct device_node *node;
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+ u32 port;
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+
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+ for_each_child_of_node(parent, node) {
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+ if (!of_property_read_u32(node, "reg", &port)) {
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+ if (port == portnum)
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+ return node;
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+ }
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+ }
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+
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+ return NULL;
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+}
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+EXPORT_SYMBOL_GPL(usb_of_get_child_node);
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+
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--- a/drivers/usb/core/usb.c
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+++ b/drivers/usb/core/usb.c
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@@ -36,6 +36,7 @@
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/debugfs.h>
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+#include <linux/usb/of.h>
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#include <asm/io.h>
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#include <linux/scatterlist.h>
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@@ -469,6 +470,7 @@ struct usb_device *usb_alloc_dev(struct
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dev->route = 0;
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dev->dev.parent = bus->controller;
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+ dev->dev.of_node = bus->controller->of_node;
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dev_set_name(&dev->dev, "usb%d", bus->busnum);
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root_hub = 1;
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} else {
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@@ -493,6 +495,14 @@ struct usb_device *usb_alloc_dev(struct
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dev->dev.parent = &parent->dev;
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dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);
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+ if (!parent->parent) {
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+ /* device under root hub's port */
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+ port1 = usb_hcd_find_raw_port_number(usb_hcd,
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+ port1);
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+ }
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+ dev->dev.of_node = usb_of_get_child_node(parent->dev.of_node,
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+ port1);
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+
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/* hub driver sets up TT records */
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}
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--- a/include/linux/usb/of.h
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+++ b/include/linux/usb/of.h
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@@ -15,6 +15,8 @@
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bool of_usb_host_tpl_support(struct device_node *np);
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int of_usb_update_otg_caps(struct device_node *np,
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struct usb_otg_caps *otg_caps);
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+struct device_node *usb_of_get_child_node(struct device_node *parent,
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+ int portnum);
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#else
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static inline bool of_usb_host_tpl_support(struct device_node *np)
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{
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@@ -25,6 +27,11 @@ static inline int of_usb_update_otg_caps
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{
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return 0;
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}
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+static inline struct device_node *usb_of_get_child_node
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+ (struct device_node *parent, int portnum)
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+{
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+ return NULL;
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+}
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#endif
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#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
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