[PATCH v3 5/8] dt-bindings: devfreq: add Exynos5422 DMC device description

[Lukasz Luba]

The patch adds description for DT binding for a new Exynos5422 Dynamic
Memory Controller device.
It also contains needed MAINTAINERS file update.

CC: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
CC: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
CC: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
CC: Rob Herring <robh+dt@xxxxxxxxxx>
CC: Mark Rutland <mark.rutland@xxxxxxx>
CC: Kukjin Kim <kgene@xxxxxxxxxx>
CC: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
CC: linux-pm@xxxxxxxxxxxxxxx
CC: linux-samsung-soc@xxxxxxxxxxxxxxx
CC: devicetree@xxxxxxxxxxxxxxx
CC: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Lukasz Luba <l.luba@xxxxxxxxxxxxxxxxxxx>
---
 .../devicetree/bindings/devfreq/exynos5422-dmc.txt | 106 +++++++++++++++++++++
 MAINTAINERS                                        |   1 +
 2 files changed, 107 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt

diff --git a/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt
new file mode 100644
index 0000000..229efba
--- /dev/null
+++ b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt
@@ -0,0 +1,106 @@
+* Exynos5422 frequency and voltage scaling for Dynamic Memory Controller device
+
+The Samsung Exynos5422 SoC has DMC (Dynamic Memory Controller) to which the DRAM
+memory chips are connected. The driver is to monitor the controller in runtime
+and switch frequency and voltage. To monitor the usage of the controller in
+runtime, the driver uses the PPMU (Platform Performance Monitoring Unit), which
+is able to measure the current load of the memory.
+When 'userspace' governor is used for the driver, an application is able to
+switch the DMC frequency.
+
+Required properties for DMC device for Exynos5422:
+- compatible: Should be "samsung,exynos5422-bus".
+- clock-names : the name of clock used by the bus, "bus".
+- clocks : phandles for clock specified in "clock-names" property.
+- devfreq-events : phandles for PPMU devices connected to this DMC.
+
+The example definition of a DMC and PPMU devices declared in DT is shown below:
+
+	ppmu_dmc0_0: ppmu@10d00000 {
+		compatible = "samsung,exynos-ppmu";
+		reg = <0x10d00000 0x2000>;
+		clocks = <&clock CLK_PCLK_PPMU_DREX0_0>;
+		clock-names = "ppmu";
+		status = "okay";
+		events {
+			ppmu_event_dmc0_0: ppmu-event3-dmc0_0 {
+				event-name = "ppmu-event3-dmc0_0";
+			};
+		};
+	};
+
+
+	ppmu_dmc0_1: ppmu@10d10000 {
+		compatible = "samsung,exynos-ppmu";
+		reg = <0x10d10000 0x2000>;
+		clocks = <&clock CLK_PCLK_PPMU_DREX0_1>;
+		clock-names = "ppmu";
+		status = "okay";
+		events {
+			ppmu_event_dmc0_1: ppmu-event3-dmc0_1 {
+				event-name = "ppmu-event3-dmc0_1";
+			};
+		};
+	};
+
+	ppmu_dmc1_0: ppmu@10d10000 {
+		compatible = "samsung,exynos-ppmu";
+		reg = <0x10d60000 0x2000>;
+		clocks = <&clock CLK_PCLK_PPMU_DREX1_0>;
+		clock-names = "ppmu";
+		status = "okay";
+		events {
+			ppmu_event_dmc1_0: ppmu-event3-dmc1_0 {
+				event-name = "ppmu-event3-dmc1_0";
+			};
+		};
+	};
+
+	ppmu_dmc1_1: ppmu@10d70000 {
+		compatible = "samsung,exynos-ppmu";
+		reg = <0x10d70000 0x2000>;
+		clocks = <&clock CLK_PCLK_PPMU_DREX1_1>;
+		clock-names = "ppmu";
+		status = "okay";
+		events {
+			ppmu_event_dmc1_1: ppmu-event3-dmc1_1 {
+				event-name = "ppmu-event3-dmc1_1";
+			};
+		};
+	};
+
+	dmc: memory-controller@10c20000 {
+		compatible = "samsung,exynos5422-dmc";
+		reg = <0x10c20000 0x10000>, <0x10c30000 0x10000>,
+			<0x10030000 0x1000>, <0x10000000 0x1000>;
+		clocks = 	<&clock CLK_FOUT_SPLL>,
+				<&clock CLK_MOUT_SCLK_SPLL>,
+				<&clock CLK_FF_DOUT_SPLL2>,
+				<&clock CLK_FOUT_BPLL>,
+				<&clock CLK_MOUT_BPLL>,
+				<&clock CLK_SCLK_BPLL>,
+				<&clock CLK_MOUT_MX_MSPLL_CCORE>,
+				<&clock CLK_MOUT_MX_MSPLL_CCORE_PHY>,
+				<&clock CLK_MOUT_MCLK_CDREX>,
+				<&clock CLK_DOUT_CLK2X_PHY0>,
+				<&clock CLK_CLKM_PHY0>,
+				<&clock CLK_CLKM_PHY1>;
+		clock-names =	"fout_spll",
+				"mout_sclk_spll",
+				"ff_dout_spll2",
+				"fout_bpll",
+				"mout_bpll",
+				"sclk_bpll",
+				"mout_mx_mspll_ccore",
+				"mout_mx_mspll_ccore_phy",
+				"mout_mclk_cdrex",
+				"dout_clk2x_phy0",
+				"clkm_phy0",
+				"clkm_phy1";
+
+		status = "okay";
+		devfreq-events = <&ppmu_dmc0_0>, <&ppmu_dmc0_1>,
+				<&ppmu_dmc1_0>, <&ppmu_dmc1_1>;
+	};
+
+
diff --git a/MAINTAINERS b/MAINTAINERS
index e81dfbf..ab0d8a5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3316,6 +3316,7 @@ L:	linux-pm@xxxxxxxxxxxxxxx
 L:	linux-samsung-soc@xxxxxxxxxxxxxxx
 S:	Maintained
 F:	drivers/devfreq/exynos5422-dmc.c
+F:	Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt
 
 BUSLOGIC SCSI DRIVER
 M:	Khalid Aziz <khalid@xxxxxxxxxxxxxx>
-- 
2.7.4