linux-kernel - Re: [alsa-devel] [PATCH v3 1/2] mfd: arizona: Add support for INn

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Message-ID: <20140829081741.GD24579@lee--X1>
Date:	Fri, 29 Aug 2014 09:17:41 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Inha Song <ideal.song@...sung.com>
Cc:	broonie@...nel.org, alsa-devel@...a-project.org,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	ckeepax@...nsource.wolfsonmicro.com, lgirdwood@...il.com,
	sameo@...ux.intel.com, devicetree@...r.kernel.org,
	galak@...eaurora.org, ijc+devicetree@...lion.org.uk,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org,
	cw00.choi@...sung.com
Subject: Re: [alsa-devel] [PATCH v3 1/2] mfd: arizona: Add support for
 INn_Modec register control

On Fri, 29 Aug 2014, Inha Song wrote:

> Hi, Lee
> Thanks for your review.
> 
> On Thu, 28 Aug 2014 12:36:51 +0100
> Lee Jones <lee.jones@...aro.org> wrote:
> 
> > On Mon, 18 Aug 2014, Inha Song wrote:
> > 
> > > Some boards need to set the INn_MODE[1:0] register to change
> > > the input signal patch. This wlf,inmode property is optional.
> > > If present, values must be specified less than or equal to
> > > the number of input singals. If values less than the number
> > > of input signals, elements that has not been specifed are set
> > > to 0 by default.
> > > 
> > > Example:
> > >    - wlf,inmode = <2 0 2>;	/* IN1, IN3 use DMIC */
> > > 
> > > Signed-off-by: Inha Song <ideal.song@...sung.com>
> > > ---
> > >  drivers/mfd/arizona-core.c | 8 +++++++-
> > >  1 file changed, 7 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> > > index 10a0cb9..81e6db8 100644
> > > --- a/drivers/mfd/arizona-core.c
> > > +++ b/drivers/mfd/arizona-core.c
> > > @@ -534,7 +534,7 @@ EXPORT_SYMBOL_GPL(arizona_of_get_named_gpio);
> > >  static int arizona_of_get_core_pdata(struct arizona *arizona)
> > >  {
> > >  	struct arizona_pdata *pdata = &arizona->pdata;
> > > -	int ret, i;
> > > +	int ret, i, proplen;
> > >  
> > >  	pdata->reset = arizona_of_get_named_gpio(arizona, "wlf,reset", true);
> > >  
> > > @@ -560,6 +560,12 @@ static int arizona_of_get_core_pdata(struct arizona *arizona)
> > >  			ret);
> > >  	}
> > >  
> > > +	proplen = of_property_count_u32_elems(arizona->dev->of_node,
> > > +					      "wlf,inmode");
> > > +	if (proplen > 0 && proplen <= ARRAY_SIZE(arizona->pdata.inmode))
> > > +		of_property_read_u32_array(arizona->dev->of_node, "wlf,inmode",
> > > +					   arizona->pdata.inmode, proplen);
> > 
> > of_property_for_each_u32()?
> 
> Is it more clear to use of_property_for_each_u32() instead of
> of_property_read_u32_array()?

It prevents you from having to use of_property_count_u32_elems() first.

> If so, I will fix in v5.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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