linux-kernel - Re: [PATCH 02/12] clocksource: sti: Provide support for the ST LPC Clocksource IP

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Message-ID: <20150508102834.GC29044@x1>
Date:	Fri, 8 May 2015 11:28:34 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...inux.com, devicetree@...r.kernel.org,
	daniel.lezcano@...aro.org, tglx@...utronix.de, wim@...ana.be,
	a.zummo@...ertech.it, linux-watchdog@...r.kernel.org,
	rtc-linux@...glegroups.com, linux@...ck-us.net
Subject: Re: [PATCH 02/12] clocksource: sti: Provide support for the ST LPC
 Clocksource IP

On Fri, 08 May 2015, Paul Bolle wrote:

> On Thu, 2015-05-07 at 14:38 +0100, Lee Jones wrote:
> > --- a/drivers/clocksource/Kconfig
> > +++ b/drivers/clocksource/Kconfig
> 
> > +config CLKSRC_ST_LPC
> > +	bool
> > +	depends on ARCH_STI
> 
> By itself this does nothing. You can't set this symbol to 'y', even if
> ARCH_STI is 'y', right? Of course, ARCH_STI will select this symbol (see
> 11/12) otherwise it would be inert. But as ARCH_STI selects
> CLKSRC_ST_LPC I'd say this dependency isn't actually needed.

I guess this is more of a representative dependency, but you're right,
the likelihood is that no one is likely to accidentally enable it.

I can remove it.

> Are other selects of CLKSRC_ST_LPC expected to be added in the future?
> If not, CLKSRC_ST_LPC should operate in lockstep with ARCH_STI. In that
> case you might as well not bother with CLKSRC_ST_LPC and use ARCH_STI
> directly. (But that forces you to move the select statement below into
> the ARCH_STI entry, which might be ugly.)

Although true, there might be cases where we need to stop this from
being enabled on all ARCH_STI platforms.  It'll be easier to move
CLKSRC_ST_LPC around in arch code than to start renaming this symbol.

I'd prefer to keep this as CLKSRC_ST_LPC if you're not passionate
about the alternative.

> > +	select CLKSRC_OF if OF
> > +	help
> > +	  Enable this option to use the Low Power controller timer
> > +	  as clocksource.
> 
> (Please add an empty line.)

I believe the new line comes in the next patch.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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