linux-kernel - Re: [PATCH v4] regulator: pfuze100: add pfuze100 regulator driver

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Date:	Wed, 24 Jul 2013 12:18:59 +0200
From:	Steffen Trumtrar <s.trumtrar@...gutronix.de>
To:	Robin Gong <b38343@...escale.com>
Cc:	broonie@...nel.org, shawn.guo@...aro.org, grant.likely@...aro.org,
	rob.herring@...xeda.com, rob@...dley.net, lgirdwood@...il.com,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] regulator: pfuze100: add pfuze100 regulator driver

On Wed, Jul 24, 2013 at 06:07:18PM +0800, Robin Gong wrote:
> On Wed, Jul 24, 2013 at 10:30:41AM +0200, Steffen Trumtrar wrote:
> > Hi!
> > 
> > I tested your patch and had to change two things to actually make it
> > work. See below...
> > 
> > On Sun, Jul 21, 2013 at 05:17:27PM +0800, Robin Gong wrote:
> > > Add pfuze100 regulator driver.
> > > 
> > > Signed-off-by: Robin Gong <b38343@...escale.com>
> > 
> > (...)
> > 
> > > ---
> > 
> > > diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
> > > new file mode 100644
> > > index 0000000..fd259ef
> > > --- /dev/null
> > > +++ b/drivers/regulator/pfuze100-regulator.c
> > > @@ -0,0 +1,462 @@
> > 
> > (...)
> > 
> > > +static struct regulator_ops pfuze100_ldo_regulator_ops = {
> > > +	.enable = regulator_enable_regmap,
> > > +	.disable = regulator_disable_regmap,
> > > +	.is_enabled = regulator_is_enabled_regmap,
> > > +	.list_voltage = regulator_list_voltage_linear,
> > > +	.set_voltage_sel = regulator_set_voltage_sel_regmap,
> > > +	.get_voltage_sel = regulator_get_voltage_sel_regmap,
> > > +};
> > > +
> > > +static struct regulator_ops pfuze100_fixed_regulator_ops = {
> > > +	.list_voltage = regulator_list_voltage_linear,
> > > +};
> > 
> > 
> > This needs:
> > 
> > diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
> > index 07d5a54..d0d67b4 100644
> > --- a/drivers/regulator/pfuze100-regulator.c
> > +++ b/drivers/regulator/pfuze100-regulator.c
> > @@ -133,6 +133,7 @@ static struct regulator_ops pfuze100_ldo_regulator_ops = {
> > 
> >  static struct regulator_ops pfuze100_fixed_regulator_ops = {
> > 	.list_voltage = regulator_list_voltage_linear,
> > +	.set_voltage_sel = regulator_set_voltage_sel_regmap,
> >  };
> > 
> >  static struct regulator_ops pfuze100_sw_regulator_ops = {
> > 
> > 
> > Otherwise the fixed_regulator VDDR isn't registered and the driver then unloads
> > completely. This is at least the case for v3.10. I haven't had the chance to test
> > it on v3.11-rcX. If the _regulator_do_set_voltage logic changes, then scratch this.
> > 
> Thanks firstly for you test with the patch. I have test it on v3.10 just now,
> and can't reproduce what you saw that VDDR regulator can't be registered
> successfully. I don't think fixed regulator need <set_voltage_sel>.

Okay. I rechecked and I was doing it wrong. I had the min/max voltage propreties
in the DT and missed the "regulator-boot-on;" property. Works fine now.

Thanks,
Steffen

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