linux-kernel - Re: [PATCHv3 1/4] mfd: smsc: Add support for smsc gpio io/keypad driver

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Message-ID: <CAAe_U6JX9QDWvWA3KH7E9sOv0EHGkozVONuXDgn+a2MZ4GTE7Q@mail.gmail.com>
Date:	Mon, 1 Oct 2012 17:23:15 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Sourav Poddar <sourav.poddar@...com>,
	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	b-cousson@...com, balbi@...com, santosh.shilimkar@...com,
	sameo@...ux.intel.com
Subject: Re: [PATCHv3 1/4] mfd: smsc: Add support for smsc gpio io/keypad driver

Hi,

On Mon, Oct 1, 2012 at 5:14 PM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> On Mon, Oct 01, 2012 at 05:00:06PM +0530, ABRAHAM, KISHON VIJAY wrote:
>> On Mon, Oct 1, 2012 at 4:31 PM, Sourav Poddar <sourav.poddar@...com> wrote:
>
> Delete irrelevant context from your replies, it makes it much easier to
> find new text.
>
>> > +static int smsc_i2c_remove(struct i2c_client *i2c)
>> > +{
>> > +       struct smsc *smsc = i2c_get_clientdata(i2c);
>> > +
>> > +       mfd_remove_devices(smsc->dev);
>
>> IMO, this should have resulted in an abort (hint: see
>> mfd_remove_devices_fn()). Trying to do mfd_remove_devices without
>> mfd_add_devices(). Use device_for_each_child here to remove the
>> device.
>
> No, this is not at all sensible - if there's an mfd_remove_devices()
> function we really ought to be able to use it to remove the children.
> If we can't do that we should fix the API usability, not open code the
> same stuff in every user.

What makes more sense to me is extend mfd_add_devices to create child
devices from dt data. Then for removing devices, one can use
mfd_remove_devices().

Thanks
Kishon
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