linux-kernel - Re: [PATCH 1/2] ARM: dts: tegra: Header file for pinctrl constants

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Date:	Tue, 03 Dec 2013 13:08:20 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>
CC:	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: dts: tegra: Header file for pinctrl constants

On 12/02/2013 11:04 PM, Laxman Dewangan wrote:
> On Monday 02 December 2013 07:55 PM, Thierry Reding wrote:
>> * PGP Signed by an unknown key
>>
>> On Mon, Dec 02, 2013 at 07:25:01PM +0530, Laxman Dewangan wrote:
>>
> 
>> +
>> +/* Schmitt enable/disable */
>> +#define TEGRA_PIN_DRIVE_SCHMITT_DISABLE            0
>> +#define TEGRA_PIN_DRIVE_SCHMITT_ENABLE            1
>> These are all boolean, so I wonder if perhaps we should be simply
>> defining a single pair and reuse that in different contexts:
>>
>>     #define TEGRA_PIN_DISABLE    0
>>     #define TEGRA_PIN_ENABLE    1
>>
>> The property names should provide enough context for them to be used
>> unambiguously.
>>
>>
> 
> I can make generic ENABLE/DISABLE macro as you suggested but datasheet
> says as 0=NORMAL, 1 = TRISTATE. and that's why I kept name very near to
> the datasheet.

That documentation is relative to a specific field, whereas the
namespace for #defines is global. Hence, we may have to name #defines
using stricter rules than the TRM's field values, in order to make them
unambiguous.
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