[U-Boot] [RFC] gpio command: return value on write, additional actions

[Detlev Zundel <dzu@denx.de>]

Hi Mike,

> On Wednesday, July 06, 2011 06:36:00 Wolfgang Denk wrote:
>> For consistency I would prefer to have all commands return the same
>> type of information, i. e. either an error status (like we do with all
>> other commands - any result values would then have to be passed as
>> environment settings)
>
> going through the env seems a little wonky.  i dont know of any other commands 
> that do this, so i dont think there's any standard to work off of here ...

I believe Wolfgang means for example this:

,----[ common/cmd_setexpr.c ]
| U_BOOT_CMD(
|         setexpr, 5, 0, do_setexpr,
|         "set environment variable as the result of eval expression",
|         "[.b, .w, .l] name value1 <op> value2\n"
|         "    - set environment variable 'name' to the result of the evaluated\n"
|         "      express specified by <op>.  <op> can be &, |, ^, +, -, *, /, %\n"
|         "      size argument is only meaningful if value1 and/or value2 are memory addresses"
| );
`----

Cheers
  Detlev

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