usb: common: introduce of_usb_get_maximum_speed() (1494a1f6) · Commits · 戴 / test

Documentation/devicetree/bindings/usb/generic.txt

0 → 100644

+24 −0

Original line number	Diff line number	Diff line
		Generic USB Properties

		Optional properties:
		- maximum-speed: tells USB controllers we want to work up to a certain
		speed. Valid arguments are "super-speed", "high-speed",
		"full-speed" and "low-speed". In case this isn't passed
		via DT, USB controllers should default to their maximum
		HW capability.
		- dr_mode: tells Dual-Role USB controllers that we want to work on a
		particular mode. Valid arguments are "host",
		"peripheral" and "otg". In case this attribute isn't
		passed via DT, USB DRD controllers should default to
		OTG.

		This is an attribute to a USB controller such as:

		dwc3@4a030000 {
		compatible = "synopsys,dwc3";
		reg = <0x4a030000 0xcfff>;
		interrupts = <0 92 4>
		usb-phy = <&usb2_phy>, <&usb3,phy>;
		maximum-speed = "super-speed";
		dr_mode = "otg";
		};

drivers/usb/usb-common.c

+38 −11

Original line number	Diff line number	Diff line
		@@ -43,9 +43,7 @@ const char *usb_otg_state_string(enum usb_otg_state state)
		}
		EXPORT_SYMBOL_GPL(usb_otg_state_string);

		const char *usb_speed_string(enum usb_device_speed speed)
		{
		static const char *const names[] = {
		static const char *const speed_names[] = {
		[USB_SPEED_UNKNOWN] = "UNKNOWN",
		[USB_SPEED_LOW] = "low-speed",
		[USB_SPEED_FULL] = "full-speed",
		@@ -54,9 +52,11 @@ const char *usb_speed_string(enum usb_device_speed speed)
		[USB_SPEED_SUPER] = "super-speed",
		};

		if (speed < 0 \|\| speed >= ARRAY_SIZE(names))
		const char *usb_speed_string(enum usb_device_speed speed)
		{
		if (speed < 0 \|\| speed >= ARRAY_SIZE(speed_names))
		speed = USB_SPEED_UNKNOWN;
		return names[speed];
		return speed_names[speed];
		}
		EXPORT_SYMBOL_GPL(usb_speed_string);

		@@ -112,6 +112,33 @@ enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
		return USB_DR_MODE_UNKNOWN;
		}
		EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);

		/**
		* of_usb_get_maximum_speed - Get maximum requested speed for a given USB
		* controller.
		* @np: Pointer to the given device_node
		*
		* The function gets the maximum speed string from property "maximum-speed",
		* and returns the corresponding enum usb_device_speed.
		*/
		enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np)
		{
		const char *maximum_speed;
		int err;
		int i;

		err = of_property_read_string(np, "maximum-speed", &maximum_speed);
		if (err < 0)
		return USB_SPEED_UNKNOWN;

		for (i = 0; i < ARRAY_SIZE(speed_names); i++)
		if (strcmp(maximum_speed, speed_names[i]) == 0)
		return i;

		return USB_SPEED_UNKNOWN;
		}
		EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed);

		#endif

		MODULE_LICENSE("GPL");

include/linux/usb/of.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -7,16 +7,24 @@
		#ifndef __LINUX_USB_OF_H
		#define __LINUX_USB_OF_H

		#include <linux/usb/ch9.h>
		#include <linux/usb/otg.h>
		#include <linux/usb/phy.h>

		#if IS_ENABLED(CONFIG_OF)
		enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np);
		enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np);
		#else
		static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
		{
		return USB_DR_MODE_UNKNOWN;
		}

		static inline enum usb_device_speed
		of_usb_get_maximum_speed(struct device_node *np)
		{
		return USB_SPEED_UNKNOWN;
		}
		#endif

		#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_PHY)

Admin message