linux-kernel - Re: [PATCH v3] mfd: arizona: Add DT options for max_channels

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Date:   Tue, 13 Sep 2016 09:54:32 +0100
From:   Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:     Rob Herring <robh@...nel.org>
CC:     <lee.jones@...aro.org>, <patches@...nsource.wolfsonmicro.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mfd: arizona: Add DT options for
 max_channels_clocked and PDM speaker config

On Mon, 2016-09-12 at 11:53 -0500, Rob Herring wrote:
> On Mon, Sep 05, 2016 at 12:56:25PM +0100, Richard Fitzgerald wrote:
> > This patch adds DT settings for the max_channels_clocked, spk_fmt and
> > spk_mute pdata.
> > 
> > Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
> > ---
> >  Documentation/devicetree/bindings/mfd/arizona.txt | 18 ++++++++++++++
> >  drivers/mfd/arizona-core.c                        | 30 +++++++++++++++++++++++
> >  2 files changed, 48 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/arizona.txt b/Documentation/devicetree/bindings/mfd/arizona.txt
> > index a6e2ea41..8f2e282 100644
> > --- a/Documentation/devicetree/bindings/mfd/arizona.txt
> > +++ b/Documentation/devicetree/bindings/mfd/arizona.txt
> > @@ -85,6 +85,24 @@ Optional properties:
> >      present, the number of values should be less than or equal to the
> >      number of inputs, unspecified inputs will use the chip default.
> >  
> > +  - wlf,max-channels-clocked : The maximum number of channels to be clocked on
> > +    each AIF, useful for I2S systems with multiple data lines being mastered.
> > +    Specify one cell for each AIF to be configured, specify zero for AIFs that
> > +    should be handled normally.
> > +    If present, number of cells must be less than or equal to the number of
> > +    AIFs. If less than the number of AIFs, for cells that have not been
> > +    specified the corresponding AIFs will be treated as default setting.
> > +
> > +  - wlf,spk-fmt : PDM speaker data format, must contain 2 cells (OUT5 and OUT6).
> > +    See the datasheet for values.
> > +    The second cell is ignored for codecs that do not have OUT6 (wm5102, wm8997,
> > +      wm8998, wm1814)
> > +
> > +  - wlf,spk-mute : PDM speaker mute setting, must contain 2 cells (OUT5 and OUT6).
> > +    See the datasheet for values.
> > +    The second cell is ignored for codecs that do not have OUT6 (wm5102, wm8997,
> > +    wm8998, wm1814)
> > +
> >    - DCVDD-supply, MICVDD-supply : Power supplies, only need to be specified if
> >      they are being externally supplied. As covered in
> >      Documentation/devicetree/bindings/regulator/regulator.txt
> > diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> > index fa267fa..c621c46 100644
> > --- a/drivers/mfd/arizona-core.c
> > +++ b/drivers/mfd/arizona-core.c
> > @@ -813,6 +813,7 @@ static int arizona_of_get_core_pdata(struct arizona *arizona)
> >  	struct property *prop;
> >  	const __be32 *cur;
> >  	u32 val;
> > +	u32 pdm_val[ARIZONA_MAX_PDM_SPK];
> >  	int ret, i;
> >  	int count = 0;
> >  
> > @@ -869,6 +870,35 @@ static int arizona_of_get_core_pdata(struct arizona *arizona)
> >  		count++;
> >  	}
> >  
> > +	count = 0;
> > +	of_property_for_each_u32(arizona->dev->of_node,
> > +				 "wlf,max-channels-clocked",
> > +				 prop, cur, val) {
> > +		if (count == ARRAY_SIZE(pdata->max_channels_clocked))
> > +			break;
> > +
> > +		pdata->max_channels_clocked[count] = val;
> > +		count++;
> > +	}
> > +
> > +	ret = of_property_read_u32_array(arizona->dev->of_node,
> > +					 "wlf,spk-fmt",
> > +					 pdm_val,
> > +					 ARRAY_SIZE(pdm_val));
> 
> Why are you using this intermediate buffer?
> 

Because targets are not u32

> > +
> > +	if (ret >= 0)
> > +		for (count = 0; count < ARRAY_SIZE(pdata->spk_fmt); ++count)
> > +			pdata->spk_fmt[count] = pdm_val[count];
> > +
> > +	ret = of_property_read_u32_array(arizona->dev->of_node,
> > +					 "wlf,spk-mute",
> > +					 pdm_val,
> > +					 ARRAY_SIZE(pdm_val));
> > +
> > +	if (ret >= 0)
> > +		for (count = 0; count < ARRAY_SIZE(pdata->spk_fmt); ++count)
> 
> s/spk_fmt/spk_mute/
> 

Damn!, I read and re-read and re-re-read that code so many times to make
sure I had the right names

> > +			pdata->spk_mute[count] = pdm_val[count];
> > +
> >  	return 0;
> >  }
> >  
> > -- 
> > 1.9.1
> >