linux-kernel - Re: [PATCH 1/6] clk: sunxi: Add support for sun9i a80 usb clocks and resets

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Date:	Tue, 4 Nov 2014 18:12:19 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Mike Turquette <mturquette@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	linux-sunxi@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/6] clk: sunxi: Add support for sun9i a80 usb clocks and
 resets

On Tue, Nov 04, 2014 at 12:07:14PM +0800, Chen-Yu Tsai wrote:
> +	spin_lock_irqsave(data->lock, flags);
> +
> +	reg = readl(data->reg);
> +	writel(reg & ~BIT(id), data->reg);
> +
> +	spin_unlock_irqrestore(data->lock, flags);

Don't we have generic support for atomic modification of register
values?  Hmm, we have it for ARM only - atomic_io_modify() and
atomic_io_modify_relaxed().

I guess we should push for those to become cross-arch if we end up
with generic drivers shared between other architectures.

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