[U-Boot] [PATCH 2/2] gpio: tegra: use named constants

[Stephen Warren <swarren@wwwdotorg.org>]

On 10/01/2015 05:00 PM, Simon Glass wrote:
> On Friday, 25 September 2015, Stephen Warren <swarren@wwwdotorg.org> wrote:
>> From: Stephen Warren <swarren@nvidia.com>
>>
>> In order to make it clear what the parameters to set_config() and
>> set_direction() mean, and similarly for the return values from the
>> respective get_*(), define named constants for these values.
>>
>> Disassembly shows no diff in the generated code, except that the
>> order of the code in the branches of tegra_gpio_get_function() gets
>> modified without affecting behaviour.

>> diff --git a/drivers/gpio/tegra_gpio.c b/drivers/gpio/tegra_gpio.c

>> +static const int CONFIG_SFIO = 0;
>> +static const int CONFIG_GPIO = 1;
>> +static const int DIRECTION_INPUT = 0;
>> +static const int DIRECTION_OUTPUT = 1;
>
> Why not use an enum?

I don't think it gives any benefit does it?

Doing so would entail 5 extra lines of overhead for the enum { and } 
lines. I'd want to define two separate enum blocks since I dislike 
putting logically unrelated enum values into a single enum definition. 
Even if I didn't do that, it's still 2 lines of useless overhead to add 
everything into a single enum.