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

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Message-ID: <5506459.umvW5Ff7a7@diego>
Date:	Mon, 27 Oct 2014 17:49:34 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	balbi@...com
Cc:	Lucas Stach <l.stach@...gutronix.de>,
	Romain Perier <romain.perier@...il.com>,
	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, 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

Am Montag, 27. Oktober 2014, 11:41:53 schrieb Felipe Balbi:
> 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.

If I'm reading patch 1 correctly, it already does handle the generic "system-
power-controller", as well as any foo,system-power-controller properties.


Heiko

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