linux-kernel - Re: [PATCH v10 12/14] usb: hcd: Adapt to OTG core

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Message-ID: <575FBDB0.20700@ti.com>
Date:	Tue, 14 Jun 2016 11:17:52 +0300
From:	Roger Quadros <rogerq@...com>
To:	unlisted-recipients:; (no To-header on input)
CC:	<peter.chen@...escale.com>, <balbi@...nel.org>, <tony@...mide.com>,
	<gregkh@...uxfoundation.org>, <dan.j.williams@...el.com>,
	<mathias.nyman@...ux.intel.com>, <Joao.Pinto@...opsys.com>,
	<sergei.shtylyov@...entembedded.com>, <jun.li@...escale.com>,
	<grygorii.strashko@...com>, <yoshihiro.shimoda.uh@...esas.com>,
	<robh@...nel.org>, <nsekhar@...com>, <b-liu@...com>,
	<joe@...ches.com>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH v10 12/14] usb: hcd: Adapt to OTG core

+Alan

On 10/06/16 16:07, Roger Quadros wrote:
> Introduce usb_otg_add/remove_hcd() for use by host
> controllers that are part of OTG/dual-role port.
> 
> Non device tree platforms can use the otg_dev argument
> to specify the OTG controller device. If otg_dev is NULL
> then the device tree node's otg-controller property is used to
> get the otg_dev device.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Acked-by: Peter Chen <peter.chen@....com>
> ---
>  drivers/usb/core/hcd.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/hcd.h |  4 ++++
>  2 files changed, 59 insertions(+)
> 
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index ae6c76d..c6f4155 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -46,6 +46,11 @@
>  #include <linux/usb.h>
>  #include <linux/usb/hcd.h>
>  #include <linux/usb/phy.h>
> +#include <linux/usb/otg.h>
> +#include <linux/usb/of.h>
> +
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
>  
>  #include "usb.h"
>  
> @@ -3025,6 +3030,56 @@ void usb_remove_hcd(struct usb_hcd *hcd)
>  }
>  EXPORT_SYMBOL_GPL(usb_remove_hcd);
>  
> +static struct otg_hcd_ops otg_hcd_intf = {
> +	.add = usb_add_hcd,
> +	.remove = usb_remove_hcd,
> +	.usb_bus_start_enum = usb_bus_start_enum,
> +	.usb_control_msg = usb_control_msg,
> +	.usb_hub_find_child = usb_hub_find_child,
> +};
> +
> +/**
> + * usb_otg_add_hcd - Register the HCD with OTG core.
> + * @hcd: the usb_hcd structure to initialize
> + * @irqnum: Interrupt line to allocate
> + * @irqflags: Interrupt type flags
> + * @otg_dev: OTG controller device managing this HCD
> + *
> + * Registers the HCD with OTG core. OTG core will call usb_add_hcd()
> + * or usb_remove_hcd() as necessary.
> + * If otg_dev is NULL then device tree node is checked for OTG
> + * controller device via the otg-controller property.
> + */
> +int usb_otg_add_hcd(struct usb_hcd *hcd,
> +		    unsigned int irqnum, unsigned long irqflags,
> +		    struct device *otg_dev)
> +{
> +	struct device *dev = hcd->self.controller;
> +
> +	if (!otg_dev) {
> +		hcd->otg_dev = of_usb_get_otg(dev->of_node);
> +		if (!hcd->otg_dev)
> +			return -ENODEV;
> +	} else {
> +		hcd->otg_dev = otg_dev;
> +	}
> +
> +	return usb_otg_register_hcd(hcd, irqnum, irqflags, &otg_hcd_intf);
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_add_hcd);
> +
> +/**
> + * usb_otg_remove_hcd - Unregister the HCD with OTG core.
> + * @hcd: the usb_hcd structure to remove
> + *
> + * Unregisters the HCD from the OTG core.
> + */
> +void usb_otg_remove_hcd(struct usb_hcd *hcd)
> +{
> +	usb_otg_unregister_hcd(hcd);
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_remove_hcd);
> +
>  void
>  usb_hcd_platform_shutdown(struct platform_device *dev)
>  {
> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> index 36bd54f..0c70282 100644
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -473,6 +473,10 @@ extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
>  extern int usb_add_hcd(struct usb_hcd *hcd,
>  		unsigned int irqnum, unsigned long irqflags);
>  extern void usb_remove_hcd(struct usb_hcd *hcd);
> +extern int usb_otg_add_hcd(struct usb_hcd *hcd,
> +			   unsigned int irqnum, unsigned long irqflags,
> +			   struct device *otg_dev);
> +extern void usb_otg_remove_hcd(struct usb_hcd *hcd);
>  extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
>  
>  struct platform_device;
> 

--
cheers,
-roger