linux-kernel - Re: [PATCH v2 06/10] mfd: tps65910: Use the standard DT property system-power-controller

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Date:	Mon, 27 Oct 2014 11:41:53 -0500
From:	Felipe Balbi <balbi@...com>
To:	Lucas Stach <l.stach@...gutronix.de>
CC:	Romain Perier <romain.perier@...il.com>, <heiko@...ech.de>,
	<devicetree@...r.kernel.org>, <broonie@...nel.org>,
	<lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>,
	<grant.likely@...aro.org>, <robh@...nel.org>,
	<mark.rutland@....com>, <johan@...nel.org>,
	<linux-pm@...r.kernel.org>, <linux@...ck-us.net>,
	<lee.jones@...aro.org>, <balbi@...com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <linux@....linux.org.uk>,
	<swarren@...dotorg.org>, <thierry.reding@...il.com>,
	<gnurou@...il.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 06/10] mfd: tps65910: Use the standard DT property
 system-power-controller

On Mon, Oct 27, 2014 at 05:35:49PM +0100, Lucas Stach wrote:
> Am Montag, den 27.10.2014, 16:26 +0000 schrieb Romain Perier:
> > No longer use custom property to define poweroff capability, use the standard
> > DT property instead.
> > 
> > Signed-off-by: Romain Perier <romain.perier@...il.com>
> > ---
> >  drivers/mfd/tps65910.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
> > index 7612d89..a7faff2 100644
> > --- a/drivers/mfd/tps65910.c
> > +++ b/drivers/mfd/tps65910.c
> > @@ -423,8 +423,7 @@ static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
> >  
> >  	board_info->irq = client->irq;
> >  	board_info->irq_base = -1;
> > -	board_info->pm_off = of_property_read_bool(np,
> > -			"ti,system-power-controller");
> > +	board_info->pm_off = of_is_system_power_controller();
> >  
> >  	return board_info;
> >  }
> You are breaking compatibility with older DTs here. This is not
> acceptable.
> 
> You may change all in-tree DTs to use the new property and also patch
> the driver to understand it, but you must make sure that the driver
> still understands the old, custom property. And especially in this case
> it isn't really hard to do.

correct, it should be simple to hide that under
of_is_system_power_controller() itself.

-- 
balbi

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