Re: [RFC PATCH] atmel_lcdfb Kconfig: remove long dependency line

From: Nicolas Ferre
Date: Tue Nov 03 2009 - 09:42:36 EST

I come back on this patch as I have a Kconfig cleanup patch series coming.

Russell King - ARM Linux :
> On Tue, Jun 23, 2009 at 04:12:54PM +0200, Nicolas Ferre wrote:
>> Haavard Skinnemoen :
>>> Nicolas Ferre wrote:
>>>> +config ARCH_ATMEL_HAS_FB
>>>> + bool
>>>> + depends on FB
>>>> + default n
>>> What happens when we unconditionally select something which depends on
>>> something else?
>> :-P
>> Experience shows that this configuration is selected.
>> The dependency allows to have a good hierarchy in the configuration tree...
>> Better proposition welcome.
> 1st - no need for 'default n' - you're specifying something that's already
> the default.


> 2nd - don't make this symbol depend on anything, and don't use the symbol
> for anything except providing a dependency for FB_ATMEL. Instead, let
> FB_ATMEL deal with the dependency on FB and ARCH_ATMEL_HAS_FB.

The problem is that if I do not setup the dependency here the menu entry
will not be available at the proper level. In fact I will see the Atmel
LCD entry here:
"Graphics support"
<*> Support for frame buffer devices --->
<*> AT91/AT32 LCD Controller support

instead of here:
"Graphics support"
---> "Support for frame buffer devices"
<*> "AT91/AT32 LCD Controller support"

So I keep the depend.

> 3rd - ISTR we have a convention for these - 'HAVE_foo' for a configuration
> option named 'foo'. So it should probably be HAVE_FB_ATMEL.

Ok, changed to HAVE_FB_ATMEL indeed.

Thanks. Best regards,
Nicolas Ferre

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