linux-kernel - Re: [PATCH v6 08/12] usb: hcd: Adapt to OTG core

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Date:	Mon, 18 Apr 2016 14:29:37 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	stern@...land.harvard.edu, balbi@...nel.org,
	gregkh@...uxfoundation.org, peter.chen@...escale.com,
	dan.j.williams@...el.com, jun.li@...escale.com,
	mathias.nyman@...ux.intel.com, tony@...mide.com,
	Joao.Pinto@...opsys.com, abrestic@...omium.org,
	r.baldyga@...sung.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH v6 08/12] usb: hcd: Adapt to OTG core

On Tue, Apr 05, 2016 at 05:05:13PM +0300, 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>
> ---
>  drivers/usb/core/hcd.c  | 71 +++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/hcd.h |  4 +++
>  2 files changed, 75 insertions(+)
> 
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 6b1930d..6a80193 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -46,6 +46,10 @@
>  #include <linux/usb.h>
>  #include <linux/usb/hcd.h>
>  #include <linux/usb/phy.h>
> +#include <linux/usb/otg.h>
> +
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
>  
>  #include "usb.h"
>  
> @@ -3013,6 +3017,73 @@ 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 manging this HCD

%s/manging/managing

> + *
> + * 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)
> +{

Some users may not want to use default otg_hcd_ops, would you please
add one more parameter (eg, hcd_ops) for that? If hcd_ops is NULL, just
use the default one.

> +	struct device *dev = hcd->self.controller;
> +
> +	if (!otg_dev) {
> +		struct device_node *np;
> +		struct platform_device *pdev;
> +
> +		np = of_parse_phandle(dev->of_node, "otg-controller", 0);
> +		if (!np) {
> +			dev_err(dev,
> +				"otg_dev is NULL and no otg-controller property in DT\n");
> +			return -EINVAL;
> +		}
> +
> +		pdev = of_find_device_by_node(np);
> +		of_node_put(np);
> +		if (!pdev) {
> +			dev_err(dev,
> +				"couldn't get otg-controller device\n");
> +			return -ENODEV;
> +		}
> +
> +		hcd->otg_dev = &pdev->dev;
> +	} else {
> +		hcd->otg_dev = otg_dev;
> +	}
> +
> +	return usb_otg_register_hcd(hcd, irqnum, irqflags, &otg_hcd_intf);
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_add_hcd);
> +

-- 

Best Regards,
Peter Chen