linux-kernel - Re: Trivial clocksource driver

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Date:	Tue, 29 Sep 2015 22:55:02 +0100
From:	Måns Rullgård <mans@...sr.com>
To:	Mason <slash.tmp@...e.fr>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: Trivial clocksource driver

Mason <slash.tmp@...e.fr> writes:

> Hello Mans,
>
> On 29/09/2015 22:18, Måns Rullgård wrote:
>
>> Mason writes:
>> 
>>> On 29/09/2015 20:32, Thomas Gleixner wrote:
>>>
>>>> On Tue, 29 Sep 2015, Mason wrote:
>>>>
>>>>> I am trying to submit a new ARM port, and Arnd pointed out that the
>>>>> clocksource code could not live in arch/arm/$PLATFORM, but had to
>>>>> move to drivers/clocksource (and it had to support DT).
>>>>>
>>>>> Did I understand correctly? Is this the right place to submit code
>>>>> as provided below?
>>>>
>>>> Yes, drivers/clocksource is the right place. You just need to submit a
>>>> formal patch, which includes a proper subject line, changelog, plus
>>>> the necessary Makefile and Kconfig modifications.
>>>
>>> OK, I'll send a formal patch tomorrow.
>>> There are no Kconfig modifications, is that OK?
>> 
>> Why don't you use my driver?  It's even simpler, and it works just fine
>> on the 87xx chip.
>> 
>> https://github.com/mansr/linux-tangox/blob/master/drivers/clocksource/clksrc-tangox.c
>
> As you know, I am using two of your complex drivers, namely
> ethernet and interrupt controller (which would have taken me
> several weeks to write). I will be submitting them upstream
> shortly, is that OK with you?

I want to test them a bit more on the 87xx first.  It's booting, but
there are a couple of niggles that should be looked into.  Getting some
documentation would expedite that process.

> I'm not using this particular driver of yours because I had
> already written the code, and porting it to DT was a good
> learning process. This is probably my only opportunity to
> actually write any kind of code for this port.

You should still be using the existing clocksource_mmio helper.  In
fact, that interface could be exposed using a generic DT binding.

-- 
Måns Rullgård
mans@...sr.com
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