linux-kernel - Re: [PATCH v2] clocksource: Add BE APIs support for clocksource counter reading.

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Date:	Fri, 26 Sep 2014 15:34:08 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Xiubo Li <Li.Xiubo@...escale.com>
cc:	daniel.lezcano@...aro.org, john.stultz@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clocksource: Add BE APIs support for clocksource
 counter reading.

On Fri, 26 Sep 2014, Xiubo Li wrote:
> For now I just added  _be() support using ioread{16,32}be.
> And i have a check of the clocksource drivers, didn't find anyone
> using LE mode on one BE SoC, so _le() APIs is not needed.

Nonsense. The existing clocksource_mmio accessor function are
providing LE access independent of the CPU endianess. So we don't need
an _le() API simply because we have it already.
 
>  cycle_t clocksource_mmio_readl_up(struct clocksource *c)
>  {
> -	return (cycle_t)readl_relaxed(to_mmio_clksrc(c)->reg);
> +	return (cycle_t)ioread32(to_mmio_clksrc(c)->reg);

And how exactly is this change related to adding BE support?

Thanks,

	tglx
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