linux-kernel - RE: [PATCH 1/2] mfd: dt: tps6586x: Add power off control

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Date:	Sat, 18 Aug 2012 06:45:32 +0800
From:	Bill Huang <bilhuang@...dia.com>
To:	'Thierry Reding' <thierry.reding@...onic-design.de>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"broonie@...nsource.wolfsonmicro.com" 
	<broonie@...nsource.wolfsonmicro.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	Xin Xie <xxie@...dia.com>,
	"lrg@...mlogic.co.uk" <lrg@...mlogic.co.uk>,
	"jhovold@...il.com" <jhovold@...il.com>,
	"kyle.manna@...l7.com" <kyle.manna@...l7.com>,
	Rhyland Klein <rklein@...dia.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] mfd: dt: tps6586x: Add power off control

nvpublic
> On Fri, Aug 17, 2012 at 02:16:28AM -0700, Bill Huang wrote:
> [...]
> > diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
> [...]
> > @@ -505,6 +519,11 @@ static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
> >  		goto err_add_devs;
> >  	}
> >
> > +	tps6586x_dev = &client->dev;
> > +
> > +	if (pdata->pm_off && !pm_power_off)
> > +		pm_power_off = tps6586x_power_off;
> > +
> 
> I think the assignment of tps6586x_dev needs to go inside the if block as well. Otherwise it might be
> overwritten by another instance for systems that actually have more than one tps6586x. Since currently
> the driver can't be built as a module it probably makes little sense to clean this up in .remove(),
> but it might still be worth adding so it isn't forgotten if and when somebody tries to convert the
> driver to a module.
> 
Thanks, good point.

> I should note that I don't like very much how the pm_power_off works.
> Maybe this should really be changed to allow passing a context for the function to work from.
> Something like:
> 
> 	pm_power_off = tps6586x_power_off;
> 	pm_power_off_data = &client->dev;
> 
> Where pm_power_off() would receive pm_power_off_data as an argument.
> 
> Even that's not very pretty. On the other hand this doesn't really buy us much because only the
> storage location of the variable would change and nothing else. But it would still make the
> association of the data clearer.
> 
> Thierry
> 
> * Unknown Key
> * 0x7F3EB3A1
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