linux-kernel - Re: [PATCH 4/6] twl4030_charger: Allow charger to control the regulator that feeds it.

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Date:	Tue, 1 May 2012 11:01:56 +1000
From:	NeilBrown <neilb@...e.de>
To:	<t-kristo@...com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, Felipe Balbi <balbi@...com>,
	Grazvydas Ignotas <notasas@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/6] twl4030_charger: Allow charger to control the
 regulator that feeds it.

On Mon, 30 Apr 2012 13:14:32 +0300 Tero Kristo <t-kristo@...com> wrote:

> Hi Neil,
> 
> As I am supposed to be acting as a maintainer for the drivers/mfd/twl-*,
> you can add an ack from me for the twl-core.c part. It looks kind of
> okay, even if I would eventually like to remove/fix the ugly regulator
> init from twl-core.

Thanks.

> 
> Just a question, who is going to merge all this seeing it is touching
> stuff all over the place?

Good question.  I'll try Anton Vorontsov as he seems to handle drivers/power/
stuff.  Maybe with your ack he will take it.  Otherwise apkm seems to be the
default if no-one else cares :-)

Thanks,
NeilBrown


> 
> -Tero
> 
> 
> On Wed, 2012-04-25 at 17:33 +1000, NeilBrown wrote:
> > The charger needs usb3v1 to be running, so add a new consumer to
> > keep it running.
> > 
> > This allows the charger to draw current even when the USB driver has
> > powered down.
> > 
> > Signed-off-by: NeilBrown <neilb@...e.de>
> > ---
> > 
> >  drivers/mfd/twl-core.c          |    9 +++++----
> >  drivers/power/twl4030_charger.c |   15 +++++++++++++++
> >  2 files changed, 20 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
> > index 7c2267e..4cbf285 100644
> > --- a/drivers/mfd/twl-core.c
> > +++ b/drivers/mfd/twl-core.c
> > @@ -723,8 +723,9 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
> >  		static struct regulator_consumer_supply usb1v8 = {
> >  			.supply =	"usb1v8",
> >  		};
> > -		static struct regulator_consumer_supply usb3v1 = {
> > -			.supply =	"usb3v1",
> > +		static struct regulator_consumer_supply usb3v1[] = {
> > +			{ .supply =	"usb3v1" },
> > +			{ .supply =	"bci3v1" },
> >  		};
> >  
> >  	/* First add the regulators so that they can be used by transceiver */
> > @@ -752,7 +753,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
> >  				return PTR_ERR(child);
> >  
> >  			child = add_regulator_linked(TWL4030_REG_VUSB3V1,
> > -						      &usb_fixed, &usb3v1, 1,
> > +						      &usb_fixed, usb3v1, 2,
> >  						      features);
> >  			if (IS_ERR(child))
> >  				return PTR_ERR(child);
> > @@ -773,7 +774,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
> >  		if (twl_has_regulator() && child) {
> >  			usb1v5.dev_name = dev_name(child);
> >  			usb1v8.dev_name = dev_name(child);
> > -			usb3v1.dev_name = dev_name(child);
> > +			usb3v1[0].dev_name = dev_name(child);
> >  		}
> >  	}
> >  	if (twl_has_usb() && pdata->usb && twl_class_is_6030()) {
> > diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
> > index 684662a..d9d8e4a 100644
> > --- a/drivers/power/twl4030_charger.c
> > +++ b/drivers/power/twl4030_charger.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/power_supply.h>
> >  #include <linux/notifier.h>
> >  #include <linux/usb/otg.h>
> > +#include <linux/regulator/machine.h>
> >  
> >  #define TWL4030_BCIMSTATEC	0x02
> >  #define TWL4030_BCIICHG		0x08
> > @@ -86,6 +87,8 @@ struct twl4030_bci {
> >  	struct work_struct	work;
> >  	int			irq_chg;
> >  	int			irq_bci;
> > +	struct regulator	*usb_reg;
> > +	int			usb_enabled;
> >  
> >  	unsigned long		event;
> >  };
> > @@ -179,6 +182,12 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
> >  			return -EACCES;
> >  		}
> >  
> > +		/* Need to keep regulator on */
> > +		if (!bci->usb_enabled) {
> > +			regulator_enable(bci->usb_reg);
> > +			bci->usb_enabled = 1;
> > +		}
> > +
> >  		/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
> >  		ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
> >  		if (ret < 0)
> > @@ -189,6 +198,10 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
> >  			TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
> >  	} else {
> >  		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
> > +		if (bci->usb_enabled) {
> > +			regulator_disable(bci->usb_reg);
> > +			bci->usb_enabled = 0;
> > +		}
> >  	}
> >  
> >  	return ret;
> > @@ -507,6 +520,8 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
> >  	bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
> >  	bci->usb.get_property = twl4030_bci_get_property;
> >  
> > +	bci->usb_reg = regulator_get(bci->dev, "bci3v1");
> > +
> >  	ret = power_supply_register(&pdev->dev, &bci->usb);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
> > 
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-omap" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 


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