linux-kernel - Re: [PATCH v4 5/6] extcon: add possibility to get extcon device by OF node

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Date:   Wed, 21 Feb 2018 16:54:42 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        dri-devel@...ts.freedesktop.org, Inki Dae <inki.dae@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Archit Taneja <architt@...eaurora.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc@...r.kernel.org, USB <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4 5/6] extcon: add possibility to get extcon device by
 OF node

On 21.02.2018 15:27, Andy Shevchenko wrote:
> On Wed, Feb 21, 2018 at 10:55 AM, Andrzej Hajda <a.hajda@...sung.com> wrote:
>> Since extcon property is not allowed in DT, extcon subsystem requires
>> another way to get extcon device. Lets try the simplest approach - get
>> edev by of_node.
>> +/*
>> + * extcon_get_edev_by_of_node - Get the extcon device from devicetree.
>> + * @node       : OF node identyfying edev
>> + *
>> + * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
>> + */
>> +struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
> First of all, the all other similar cases use "_by_node" in the name.

OK, looks better.

> Second, it's not _get_, it's _find_.

The patch splits exisiting extcon_get_edev_by_phandle function into two
functions, nothing more.
Thus it followed naming convention present in extcon framework. I can
switch it of course to _find_.

>
>> +{
>> +       struct extcon_dev *edev;
>> +
>> +       mutex_lock(&extcon_dev_list_lock);
>> +       list_for_each_entry(edev, &extcon_dev_list, entry)
>> +               if (edev->dev.parent && edev->dev.parent->of_node == node)
>> +                       goto out;
>> +       edev = ERR_PTR(-EPROBE_DEFER);
>> +out:
>> +       mutex_unlock(&extcon_dev_list_lock);
>> +
>> +       return edev;
> Can't it be done using bus_find_device()?

There is no special extcon bus, so I am not sure. Anyway if it can, it
should be done probably in another patch.

Regards
Andrzej