linux-kernel - Re: [PATCH] Topcliff PHUB: Generate PacketHub driver

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Date:	Tue, 15 Jun 2010 12:42:27 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Masayuki Ohtake" <masa-korg@....okisemi.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Andrew" <andrew.chih.howe.khor@...el.com>,
	"Intel OTC" <joel.clark@...el.com>, "Wang, Qi" <qi.wang@...el.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>
Subject: Re: [PATCH] Topcliff PHUB: Generate PacketHub driver

On Tuesday 15 June 2010, Masayuki Ohtake wrote:
> >This should not be necessary. Just use CONFIG_PCH_CAN_PCLK_50MHZ directly
> >in the code instead of the extra PCH_CAN_PCLK_50MHZ macro.
> 
> I have a question. I show the above reason.
> In case CAN is integrated as MODULE, macro name is CONFIG_PCH_CAN_PCLK_50MHZ_MODULE.
> On the other hand, integrated as built-in, CONFIG_PCH_CAN_PCLK_50MHZ.
> To prevent PHUB source code from integrated as MODULE or BUILT-IN,
> we re-define macro name in Makefile.
> 
> If use CONFIG_PCH_CAN_PCLK_50MHZ directly in the source code,
> in case buit-in, behavior is not correct.
> But in case module, behavior is not correct.

I don't understand the problem, because you have the definition

config PCH_CAN_PCLK_50MHZ
       bool "CAN PCLK 50MHz"
       depends on PCH_PHUB

which is 'bool', not 'tristate', so it can never be a module.
If you are referring to a dependency on the CAN code that is
not part of this patch, you can express this as

config PCH_CAN_PCLK_50MHZ
       bool "CAN PCLK 50MHz"
       depends on PCH_PHUB || CAN != "n"

This will leave CONFIG_PCH_CAN_PCLK_50MHZ as bool and let it only
get enabled if CONFIG_CAN is either "y" or "m".
Does that answer your question?

	Arnd
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