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

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Date:	Wed, 20 Apr 2016 09:47:38 +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 19/04/16 11:14, Peter Chen wrote:
> On Mon, Apr 18, 2016 at 02:29:37PM +0800, 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
>>
>>> + *
>>> + * 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.
>>
> 
> I forgot there is .start_host at otg fsm API when reviewing, so it is
> ok to have a unified hcd_ops, the user can do platform things at
> fsm.start_host.
> 
OK, great :).

cheers,
-roger