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

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Date:	Wed, 20 Apr 2016 09:46:54 +0300
From:	Roger Quadros <rogerq@...com>
To:	Peter Chen <hzpeterchen@...il.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 18/04/16 09:29, Peter Chen wrote:
> 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

OK.

> 
>> + *
>> + * 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.
> 

Can we please wait to add anything new till we have such users?

>> +	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);
>> +
> 

--
cheers,
-roger