linux-kernel - Re: [PATCH v1 07/12] usb: roles: Find the usb role switch by also matching against the device node

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Message-ID: <e9a8f745-6211-d6d2-24f0-ac86f82924f0@huawei.com>
Date:   Mon, 21 Jan 2019 16:36:13 +0800
From:   Chen Yu <chenyu56@...wei.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
CC:     <liuyu712@...ilicon.com>, USB <linux-usb@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Suzhuangluan <suzhuangluan@...ilicon.com>,
        Kongfei <kongfei@...ilicon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "John Stultz" <john.stultz@...aro.org>
Subject: Re: [PATCH v1 07/12] usb: roles: Find the usb role switch by also
 matching against the device node

Hi Heikki,

On 2018/12/3 20:25, Heikki Krogerus wrote:
> Hi,
> 
> On Mon, Dec 03, 2018 at 10:17:20AM +0200, Andy Shevchenko wrote:
>> On Mon, Dec 3, 2018 at 5:45 AM Yu Chen <chenyu56@...wei.com> wrote:
>>>
>>> This patch adds code for supporting find usb role switch by matching against
>>> the device node described using of_graph.
>>
>>>  #include <linux/module.h>
>>>  #include <linux/mutex.h>
>>>  #include <linux/slab.h>
>>> +#include <linux/of.h>
>>> +#include <linux/of_graph.h>
>>
>> Keep it ordered.
>>
>>> +static int __switch_match_by_of_node(struct device *dev, const void *name)
>>> +{
>>> +       if (!dev->parent || !dev->parent->of_node)
>>> +               return 0;
>>> +
>>> +       return of_node_name_eq(dev->parent->of_node, (const char *)name);
>>> +}
>>
>> I think Heikki has introduced some more generic function for this.
> 
> Yes, for this I'm proposing a new function fwnode_get_name() that
> should allow us to support ACPI as well as OF platforms:
> https://lkml.org/lkml/2018/11/28/784
> 
>>>         sw = device_connection_find_match(dev, "usb-role-switch", NULL,
>>>                                           usb_role_switch_match);
>>
>>> +       sw = of_graph_find_match_by_type(dev, "usb-role-switch");
>>
>> Why this is here?! device_connection_find_match() should take care for OF case.
> 
> Exactly. device_connection_find_match() needs to parse the graph (OF
> and ACPI), and I already made proposal (RFC) for that:
> https://lkml.org/lkml/2018/10/24/619
> 
> I have prepared a more finalized version of those patches. I've been
> waiting for that fwnode_get_name() to be accepted before sending it
> out since we are going to need that function, but I'll send a new RFC
> if nothing happens soon with that fwnode_get_name() series.
> 
> 
> Br,
> 

Have the fwnode_get_name() patches been accepted?
And I will be grateful if you can tell me your plan about the
https://lkml.org/lkml/2018/10/24/619 patches.

thanks
- Yu Chen