linux-kernel - [RFC 3/3] ARM: dts: Use frequency scaling for MSHC

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Date:	Mon, 12 Jan 2015 10:23:05 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, Kukjin Kim <kgene@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [RFC 3/3] ARM: dts: Use frequency scaling for MSHC

Enable frequency scaling on MSHC to reduce energy consumption. In idle
this reduced energy consumption by 1.0% (from 27.16 mA to 26.89 mA).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
---
 arch/arm/boot/dts/exynos3250-rinato.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/exynos3250-rinato.dts b/arch/arm/boot/dts/exynos3250-rinato.dts
index e53f62f216ba..aad09109fdbc 100644
--- a/arch/arm/boot/dts/exynos3250-rinato.dts
+++ b/arch/arm/boot/dts/exynos3250-rinato.dts
@@ -493,6 +493,7 @@
 	vmmc-supply = <&ldo12_reg>;
 	clock-frequency = <100000000>;
 	clock-freq-min-max = <400000 100000000>;
+	frequency-scaling;
 	samsung,dw-mshc-ciu-div = <1>;
 	samsung,dw-mshc-sdr-timing = <0 1>;
 	samsung,dw-mshc-ddr-timing = <1 2>;
-- 
1.9.1

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