linux-kernel - Re: [PATCH v2] mfd: arizona: Add DT options for max_channels

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Date:   Fri, 2 Sep 2016 12:51:46 -0500
From:   Rob Herring <robh@...nel.org>
To:     Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        patches@...nsource.wolfsonmicro.com,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mfd: arizona: Add DT options for max_channels_clocked
 and PDM speaker config

On Fri, Sep 2, 2016 at 10:56 AM, Richard Fitzgerald
<rf@...nsource.wolfsonmicro.com> wrote:
> On Fri, 2016-09-02 at 10:34 -0500, Rob Herring wrote:
>> On Wed, Aug 31, 2016 at 10:25:43AM +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 | 11 ++++++++
>>
>> Binding looks fine, but...
>>
>> >  drivers/mfd/arizona-core.c                        | 31 +++++++++++++++++++++++
>> >  2 files changed, 42 insertions(+)
>>
>> > diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
>> > index b95ff2d..36a9633 100644
>> > --- a/drivers/mfd/arizona-core.c
>> > +++ b/drivers/mfd/arizona-core.c
>> > @@ -816,6 +816,37 @@ 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++;
>> > +   }
>>
>> of_property_read_u32_array doesn't work for you?
>
> No, it doesn't, because it doesn't read a variable-sized array.

But the next 2 loops are fixed with 2 elements, right? They should be
converted. If not fixed size, you have the same pattern repeated 3
times.

Maybe we should fix of_property_read_u32_array to be more flexible and
return an array less than a max size. Not sure if anyone relies on
that case failing though, so leaving the 1st loop is fine.

Rob

>> > +   count = 0;
>> > +   of_property_for_each_u32(arizona->dev->of_node, "wlf,spk-fmt", prop,
>> > +                            cur, val) {
>> > +           if (count == ARRAY_SIZE(pdata->spk_fmt))
>> > +                   break;
>> > +
>> > +           pdata->spk_fmt[count] = val;
>> > +           count++;
>> > +   }
>> > +
>> > +   count = 0;
>> > +   of_property_for_each_u32(arizona->dev->of_node, "wlf,spk-mute", prop,
>> > +                            cur, val) {
>> > +           if (count == ARRAY_SIZE(pdata->spk_mute))
>> > +                   break;
>> > +
>> > +           pdata->spk_mute[count] = val;
>> > +           count++;
>> > +   }
>> > +
>> >     return 0;
>> >  }
>> >
>> > --
>> > 1.9.1
>> >
>> > --
>> > To unsubscribe from this list: send the line "unsubscribe devicetree" in
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>
>