linux-kernel - Re: [PATCH 1/1] mfd: palmas: Add power off control

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Date:	Tue, 30 Jul 2013 23:22:47 -0700
From:	Bill Huang <bilhuang@...dia.com>
To:	Nishanth Menon <nm@...com>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"broonie@...aro.org" <broonie@...aro.org>,
	"j-keerthy@...com" <j-keerthy@...com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"ian@...mlogic.co.uk" <ian@...mlogic.co.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mallikarjun Kasoju <mkasoju@...dia.com>
Subject: Re: [PATCH 1/1] mfd: palmas: Add power off control

On Tue, 2013-07-30 at 21:17 +0800, Nishanth Menon wrote:
> On 07/30/2013 07:05 AM, Bill Huang wrote:
> > Hook up "pm_power_off" to palmas power off routine if there is DT
> > property "ti,system-power-controller" defined, so platform which is
> > powered by this regulator can be powered off properly.
> >
> > Based on work by:
> > Mallikarjun Kasoju <mkasoju@...dia.com>
> >
> > Signed-off-by: Bill Huang <bilhuang@...dia.com>
> > cc: Mallikarjun Kasoju <mkasoju@...dia.com>
> > ---
> >   .../devicetree/bindings/regulator/palmas-pmic.txt  |    5 +++++
> >   drivers/mfd/palmas.c                               |   23 ++++++++++++++++++--
> >   include/linux/mfd/palmas.h                         |    1 +
> any reason why it wont fit in drivers/power/reset/ is'nt it the right 
> place to add this?
> >   3 files changed, 27 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/regulator/palmas-pmic.txt b/Documentation/devicetree/bindings/regulator/palmas-pmic.txt
> > index 30b0581..4adca2a 100644
> > --- a/Documentation/devicetree/bindings/regulator/palmas-pmic.txt
> > +++ b/Documentation/devicetree/bindings/regulator/palmas-pmic.txt
> > @@ -36,6 +36,9 @@ Optional nodes:
> >   	       ti,smps-range - OTP has the wrong range set for the hardware so override
> >   	       0 - low range, 1 - high range.
> >
> > +- ti,system-power-controller: Telling whether or not this pmic is controlling
> controller or master?

We name it controller since it controls the system power of the
platform, I'm not sure will it make more sense to be master? Or does it
makes sense to other pmic which also control the system power (the same
property are already used in pmic TPS6586x and TPS65910).

> > +			      the system power.
> > +
> >   Example:
> >
> >   #include <dt-bindings/interrupt-controller/irq.h>
> > @@ -48,6 +51,8 @@ pmic {
> >
> >   	ti,ldo6-vibrator;
> >
> > +	ti,system-power-controller;
> > +
> >   	regulators {
> >   		smps12_reg : smps12 {
> >   			regulator-name = "smps12";
> > diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
> > index e4d1c70..0662b21 100644
> > --- a/drivers/mfd/palmas.c
> > +++ b/drivers/mfd/palmas.c
> > @@ -229,6 +229,22 @@ static void palmas_dt_to_pdata(struct i2c_client *i2c,
> >   					PALMAS_POWER_CTRL_ENABLE2_MASK;
> >   	if (i2c->irq)
> >   		palmas_set_pdata_irq_flag(i2c, pdata);
> > +
> > +	pdata->pm_off = of_property_read_bool(node,
> > +			"ti,system-power-controller");
> > +}
> > +
> > +static struct palmas *palmas_dev;
> > +static void palmas_power_off(void)
> > +{
> > +	unsigned int addr;
> > +
> > +	if (!palmas_dev)
> > +		return;
> > +
> > +	addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_DEV_CTRL);
> > +
> > +	regmap_update_bits(palmas_dev->regmap[0], addr, 1, 0);
> slave = PALMAS_BASE_TO_SLAVE(base);
> addr = PALMAS_BASE_TO_REG(base, reg);
> 
> r = regmap_update_bits(palmas->regmap[slave], addr, mask, val);
> instead?
> 
> just for reference, an old implementation I had done is available at [1]
> 
Thanks, I'll send out v2.
> 
> [1] 
> http://git.omapzoom.org/?p=kernel/omap.git;a=blob;f=drivers/mfd/palmas-poweroff.c;hb=p-linux-omap-3.4
> 


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