linux-kernel - Re: [RFC 3/5] ARM: OMAP2+: timer: Add clocksource initialization and powerup support

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Message-ID: <CAL_JsqJpyO_N-YSvfq+YupJw8Eo_TM1AoHkRqaEHcXCry7t-Dg@mail.gmail.com>
Date:	Fri, 14 Mar 2014 16:16:39 -0500
From:	Rob Herring <robh@...nel.org>
To:	Kevin Hilman <khilman@...aro.org>
Cc:	Joel Fernandes <joelf@...com>, Tony Lindgren <tony@...mide.com>,
	Tero Kristo <t-kristo@...com>, Nishanth Menon <nm@...com>,
	Suman Anna <s-anna@...com>, Felipe Balbi <balbi@...com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 3/5] ARM: OMAP2+: timer: Add clocksource initialization and
 powerup support

On Fri, Mar 14, 2014 at 4:09 PM, Kevin Hilman <khilman@...aro.org> wrote:
> Joel Fernandes <joelf@...com> writes:
>
>> On 03/13/2014 04:52 PM, Rob Herring wrote:
>>> On Thu, Mar 13, 2014 at 3:35 PM, Joel Fernandes <joelf@...com> wrote:
>>>> Introduce a generic omap timer initialization function that can
>>>> be used by all SoCs for which support is available in the clocksource
>>>> driver introduced in the series.
>>>>
>>>> The function will also be responsible for calling clock initialization
>>>> required for everything else to work.
>>>>
>>>> Signed-off-by: Joel Fernandes <joelf@...com>

[snip]

>>>> +void omap_generic_timer_init(void)
>>>> +{
>>>> +       if (!of_have_populated_dt())
>>>> +               BUG_ON("Generic timer init should only be used for DT boot\n");
>>>
>>> I thought omap2 is always DT boot now.
>>
>> That's right, sorry- I'll get rid of the check.
>
> Actually, mainline still supports legacy boot and has board files for
> OMAP3 platforms, and we shouldn't break legacy boot on purpose IMO.

It is not breaking anything. You'd have to call this function
mistakenly from a legacy machine desc or other non-DT boot path. It's
a question of how paranoid you are adding checks. IMHO, the BUG_ON is
quite pointless here. You are not likely to progress much further
anyway, and you won't see the BUG print because the serial port is not
up yet.

Rob
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