linux-kernel - Re: [PATCH v2 2/5] extcon: arizona: Add basic microphone detection DT/ACPI bindings

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Date:	Fri, 19 Jun 2015 19:31:49 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	Lee Jones <lee.jones@...aro.org>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH v2 2/5] extcon: arizona: Add basic microphone detection
 DT/ACPI bindings

On Fri, Jun 19, 2015 at 6:08 PM, Charles Keepax
<ckeepax@...nsource.wolfsonmicro.com> wrote:
> On Fri, Jun 19, 2015 at 05:28:11PM +0900, Chanwoo Choi wrote:
>> On Fri, Jun 19, 2015 at 5:17 PM, Charles Keepax
>> <ckeepax@...nsource.wolfsonmicro.com> wrote:
>> > On Fri, Jun 19, 2015 at 11:25:57AM +0900, Chanwoo Choi wrote:
>> >> Hi Charles,
>> >>
>> >> On Thu, Jun 18, 2015 at 11:43 PM, Charles Keepax
>> >> <ckeepax@...nsource.wolfsonmicro.com> wrote:
>> >> > This patch adds bindings for the basic microphone detection platform
>> >> > data.
>> >> >
>> >> > Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
>> >> > ---
>> >> > +       dbtime = 0;
>> >> > +       device_property_read_u32(arizona->dev, "wlf,micd-dbtime", &dbtime);
>> >> > +       switch (dbtime) {
>> >> > +       case 2:
>> >>
>> >> I'd like you to define the constant variable for specific integer
>> >> value to improve the readability.
>> >> e.g.,
>> >>
>> >> #define MICD_DBTIME_XXX 2
>> >> #define MICD_DBTIME_XXX 4
>> >>
>> >> > +               pdata->micd_dbtime = 0x10000;
>> >>
>> >> Also, you better to define the constant variable for "0x10000" to
>> >> improbe readability in the include/linux/mfd/arizona.h. If you just
>> >> use the hex value, the other developer cannot analyze the meaning of
>> >> "0x10000".
>> >>
>> >> > +               break;
>> >> > +       case 4:
>> >>
>> >> ditto.
>> >>
>> >
>> > I am not sure these two really warrant a define the number in DT
>> > indicates the number of debounces to perform.
>> >
>> > #define MICD_DBTIME_TWO 2
>>
>> No. I mean that you should define the appropriate name of definition
>> to indicate the meaning of 2 or 4. Just not 2 -> TWO.
>>
>> 2 is 2 second? or 2 is milli-second? or Is there any other meaning?
>> I can never know the meaning of '2' without any description and any
>> proper name of definition.
>
> It is literally two, two debounces, I really can't see what I
> could call the define. What do you think to the idea I suggested
> to rename the variable dbtime -> num_debounces?

Is it either "debounce time" or "the number of debounce"?

Also,

When extcon-arizona driver update the bit for micd_dbtime, use the
ARIZONA_MICD_DBTIME_MASK (0x0002).

In following case, 0x10000 is larger than ARIZONA_MICD_DBTIME_MASK(0x0002).

          case 2:
                pdata->micd_dbtime = 0x10000;

Is it correct?

I thinkt that "arizona->pdata.micd_dbtime <<
ARIZONA_MICD_DBTIME_SHIFT" value should be included in the range of
ARIZONA_MICD_DBTIME_MASK(0x0002).

Thanks,
Chanwoo Choi
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