From: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org> To: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> Cc: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, balbi-l0cyMroinI0@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, valentin.longchamp-SkAbAL50j+5BDgjK7y7TUQ@public.gmane.org Subject: Re: [RFC PATCH 1/2] USB: core: let USB device know device node Date: Fri, 8 Jan 2016 17:50:13 -0500 (EST) [thread overview] Message-ID: <Pine.LNX.4.44L0.1601081746080.21467-100000@netrider.rowland.org> (raw) In-Reply-To: <1452231864-11171-2-git-send-email-peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> On Fri, 8 Jan 2016, Peter Chen 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-KZfg59tc24xl57MIdRCFDg@public.gmane.org> > --- > +#include <linux/module.h> > +#include <linux/moduleparam.h> Do you need those two #include's? > +#include <linux/of.h> > + > +/** > + * usb_of_find_node - Find the device node match port number > + * @dev: the parent device node The parameter is actually named "parent". > + * @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; > + } > + } > + > + return NULL; > +} > +EXPORT_SYMBOL_GPL(usb_of_find_node); > + > diff --git a/include/linux/usb.h b/include/linux/usb.h > index 89533ba..a3a0b07 100644 > --- a/include/linux/usb.h > +++ b/include/linux/usb.h > @@ -21,6 +21,7 @@ > #include <linux/sched.h> /* for current && schedule_timeout */ > #include <linux/mutex.h> /* for struct mutex */ > #include <linux/pm_runtime.h> /* for runtime PM */ > +#include <linux/of.h> /* for device tree */ I think you don't need this line. You can simply write: struct device_node; just like the two lines below. > struct usb_device; > struct usb_driver; > @@ -616,6 +617,7 @@ struct usb_device { > struct usb3_lpm_parameters u1_params; > struct usb3_lpm_parameters u2_params; > unsigned lpm_disable_count; > + struct device_node *of_node; /* associated device tree node */ > }; > #define to_usb_device(d) container_of(d, struct usb_device, dev) Alan Stern -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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From: stern@rowland.harvard.edu (Alan Stern) To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 1/2] USB: core: let USB device know device node Date: Fri, 8 Jan 2016 17:50:13 -0500 (EST) [thread overview] Message-ID: <Pine.LNX.4.44L0.1601081746080.21467-100000@netrider.rowland.org> (raw) In-Reply-To: <1452231864-11171-2-git-send-email-peter.chen@freescale.com> On Fri, 8 Jan 2016, Peter Chen 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@freescale.com> > --- > +#include <linux/module.h> > +#include <linux/moduleparam.h> Do you need those two #include's? > +#include <linux/of.h> > + > +/** > + * usb_of_find_node - Find the device node match port number > + * @dev: the parent device node The parameter is actually named "parent". > + * @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; > + } > + } > + > + return NULL; > +} > +EXPORT_SYMBOL_GPL(usb_of_find_node); > + > diff --git a/include/linux/usb.h b/include/linux/usb.h > index 89533ba..a3a0b07 100644 > --- a/include/linux/usb.h > +++ b/include/linux/usb.h > @@ -21,6 +21,7 @@ > #include <linux/sched.h> /* for current && schedule_timeout */ > #include <linux/mutex.h> /* for struct mutex */ > #include <linux/pm_runtime.h> /* for runtime PM */ > +#include <linux/of.h> /* for device tree */ I think you don't need this line. You can simply write: struct device_node; just like the two lines below. > struct usb_device; > struct usb_driver; > @@ -616,6 +617,7 @@ struct usb_device { > struct usb3_lpm_parameters u1_params; > struct usb3_lpm_parameters u2_params; > unsigned lpm_disable_count; > + struct device_node *of_node; /* associated device tree node */ > }; > #define to_usb_device(d) container_of(d, struct usb_device, dev) Alan Stern
next prev parent reply other threads:[~2016-01-08 22:50 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-08 5:44 [RFC PATCH 0/2] USB: let the USB device know device node Peter Chen 2016-01-08 5:44 ` Peter Chen [not found] ` <1452231864-11171-1-git-send-email-peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> 2016-01-08 5:44 ` [RFC PATCH 1/2] USB: core: let " Peter Chen 2016-01-08 5:44 ` Peter Chen [not found] ` <1452231864-11171-2-git-send-email-peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> 2016-01-08 8:22 ` Arnd Bergmann 2016-01-08 8:22 ` Arnd Bergmann 2016-01-09 8:56 ` Peter Chen 2016-01-09 8:56 ` Peter Chen 2016-01-08 14:32 ` Rob Herring 2016-01-08 14:32 ` Rob Herring [not found] ` <CAL_JsqKwATxGiqJ_MNV6_pur1dUEVOzH+iB8yY+kWA0y2gWbNg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-01-09 9:05 ` Peter Chen 2016-01-09 9:05 ` Peter Chen 2016-01-09 15:20 ` Rob Herring 2016-01-09 15:20 ` Rob Herring 2016-01-08 22:50 ` Alan Stern [this message] 2016-01-08 22:50 ` Alan Stern [not found] ` <Pine.LNX.4.44L0.1601081746080.21467-100000-pYrvlCTfrz9XsRXLowluHWD2FQJk+8+b@public.gmane.org> 2016-01-09 9:32 ` Peter Chen 2016-01-09 9:32 ` Peter Chen 2016-01-08 5:44 ` [RFC PATCH 2/2] usb: Example for how to use device node at usb device driver Peter Chen 2016-01-08 5:44 ` Peter Chen [not found] ` <1452231864-11171-3-git-send-email-peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> 2016-01-08 8:26 ` Arnd Bergmann 2016-01-08 8:26 ` Arnd Bergmann 2016-01-09 8:57 ` Peter Chen 2016-01-09 8:57 ` Peter Chen
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