linux-kernel - Re: [PATCH 3/6] Clocksource: add nuc970 clocksource driver

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Message-ID: <5773F30F.3020201@linaro.org>
Date:	Wed, 29 Jun 2016 18:10:55 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Wan Zongshun <vw@...mu.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@...linux.org.uk>,
	devicetree@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Wan Zongshun <mcuos.com@...il.com>
Subject: Re: [PATCH 3/6] Clocksource: add nuc970 clocksource driver

On 06/29/2016 05:25 PM, Arnd Bergmann wrote:
> On Saturday, June 25, 2016 6:37:19 PM CEST Wan Zongshun wrote:
>> This patch is to add nuc970 clocksource driver support.
>>
>> Signed-off-by: Wan Zongshun <mcuos.com@...il.com>
>> ---
>>   .../mach-w90x900/include/mach/nuc970-regs-timer.h  |  44 +++++
>>   drivers/clocksource/Kconfig                        |   8 +
>>   drivers/clocksource/Makefile                       |   1 +
>>   drivers/clocksource/timer-nuc900.c                 | 207 +++++++++++++++++++++
>>   4 files changed, 260 insertions(+)
>>   create mode 100644 arch/arm/mach-w90x900/include/mach/nuc970-regs-timer.h
>>   create mode 100644 drivers/clocksource/timer-nuc900.c
>>
>> diff --git a/arch/arm/mach-w90x900/include/mach/nuc970-regs-timer.h b/arch/arm/mach-w90x900/include/mach/nuc970-regs-timer.h
>> new file mode 100644
>> index 0000000..43d7e8b
>> --- /dev/null
>> +++ b/arch/arm/mach-w90x900/include/mach/nuc970-regs-timer.h
>
> Please move the contents of the header file into the driver. We try to not
> have any new mach/*.h headers.
>
>> +
>> +static unsigned int timer0_load;
>> +static void __iomem *tmr_base;
>> +
>> +static int nuc970_clockevent_set_oneshot(struct clock_event_device *evt)
>> +{
>> +	unsigned int val;
>> +
>> +	val = __raw_readl(tmr_base + REG_TMR_TCSR0);
>> +	val &= ~(0x03 << 27);
>> +
>> +	val |= (ONESHOT | COUNTEN | INTEN | PRESCALE);
>> +
>> +	__raw_writel(val, tmr_base + REG_TMR_TCSR0);
>> +	return 0;
>> +}
>> +
>
> writel() instead of __raw_writel()

Wan Zongshun,

FYI : https://lkml.org/lkml/2015/12/18/422

Not sure it does a noticeable difference on arm926.

Thanks Arnd for the clarification.

   -- Daniel


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