linux-kernel - Re: [PATCH v3 02/10] clk: sunxi-ng: Add MP_MMC clocks that support MMC timing modes switching

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Date:   Tue, 25 Jul 2017 09:32:50 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 02/10] clk: sunxi-ng: Add MP_MMC clocks that support
 MMC timing modes switching

On Mon, Jul 24, 2017 at 09:58:57PM +0800, Chen-Yu Tsai wrote:
> All of our MMC clocks are of the MP clock type. A few MMC clocks on some
> SoCs, such as MMC2 on the A83T, support new/old timing mode switching.
> 
> From a clock rate point of view, when the new timing mode is active. the
> output clock rate is halved.
> 
> This patch adds a special wrapper class of clocks, MP_MMC, around the
> generic MP type clocks. The rate related callbacks in ccu_mp_mmc_ops
> for this class look at the timing mode bit and apply the /2 post-divider
> when needed, before passing it through to the generic class ops,
> ccu_mp_ops.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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