linux-kernel - Re: [PATCH v2 1/3] drivers: power: twl4030_charger: fix link problems when building as module

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Message-ID: <20150924203924.GD3125@earth>
Date:	Thu, 24 Sep 2015 22:39:25 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Belisko Marek <marek.belisko@...il.com>
Cc:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"Dr. H. Nikolaus Schaller" <hns@...delico.com>,
	LKML <linux-kernel@...r.kernel.org>, Neil Brown <neilb@...e.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/3] drivers: power: twl4030_charger: fix link
 problems when building as module

Hi,

On Thu, Sep 24, 2015 at 09:09:15PM +0200, Belisko Marek wrote:
> On Tue, Sep 22, 2015 at 11:29 PM, Sebastian Reichel <sre@...nel.org> wrote:
> > On Tue, Sep 22, 2015 at 10:19:29PM +0200, Marek Belisko wrote:
> >> If either twl4030_charger or twl4030_madc is configured as MODULE,
> >> we get build (link) errors.
> >>
> >> To solve, the direct call of twl4030_get_madc_conversion() is replaced
> >> by a call to iio_read_channel_processed().
> >>
> >> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> >> Signed-off-by: Marek Belisko <marek@...delico.com>
> >> ---
> >> changes from V1: added missing iio_channel_release + document and add new DT bindings
> >
> > That was fast :) Patchset looks fine to me except for one last
> > thing: Let's make the iio-channel optional, so that old DT blobs
> > are still supported. Also the IS_REACHABLE(CONFIG_TWL4030_MADC)
> > check can be removed, it should no longer be needed with
> > iio_read_channel_processed().
> OK I updated driver code to pass when 'vac' property isn't found in
> DT. Should I mark it also
> in DT bindings or keep it as it was in v2? Thanks.

Move it from "Required properties:" to "Optional properties:". Maybe
stating, that the feature does not work, if it's not provided.

-- Sebastian

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