linux-kernel - [RFC PATCH 04/15] ARM: dts: Add DMC bus freqeuncy for exynos3250-rinato/monk

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Date:	Thu, 26 Nov 2015 22:47:28 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	kgene@...nel.org, k.kozlowski@...sung.com
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, tjakobi@...h.uni-bielefeld.de,
	cw00.choi@...sung.com, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: [RFC PATCH 04/15] ARM: dts: Add DMC bus freqeuncy for
 exynos3250-rinato/monk

This patch adds the DMC (DRAM Memory Controller) bus frequency node
which includes the devfreq-events and regulator properties. The bus
frequency support the DVFS (Dynamic Voltage Frequency Scaling) feature
with ondemand governor.

The devfreq-events (ppmu_dmc0*) can monitor the utilization of DMC bus
on runtime and the buck1_reg (VDD_MIF power line) supplies the power to
the DMC block.

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 arch/arm/boot/dts/exynos3250-monk.dts   | 6 ++++++
 arch/arm/boot/dts/exynos3250-rinato.dts | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/exynos3250-monk.dts b/arch/arm/boot/dts/exynos3250-monk.dts
index 443a35085846..d982586a6533 100644
--- a/arch/arm/boot/dts/exynos3250-monk.dts
+++ b/arch/arm/boot/dts/exynos3250-monk.dts
@@ -498,6 +498,12 @@
 	};
 };
 
+&bus_dmc {
+	devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
+	vdd-supply = <&buck1_reg>;
+	status = "okay";
+};
+
 &xusbxti {
 	clock-frequency = <24000000>;
 };
diff --git a/arch/arm/boot/dts/exynos3250-rinato.dts b/arch/arm/boot/dts/exynos3250-rinato.dts
index 3e64d5dcdd60..61477943015b 100644
--- a/arch/arm/boot/dts/exynos3250-rinato.dts
+++ b/arch/arm/boot/dts/exynos3250-rinato.dts
@@ -675,6 +675,12 @@
 	};
 };
 
+&bus_dmc {
+	devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
+	vdd-supply = <&buck1_reg>;
+	status = "okay";
+};
+
 &xusbxti {
 	clock-frequency = <24000000>;
 };
-- 
1.9.1

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