[PATCH v4 6/6] arm64: dts: imx8m: Add ddr controller nodes

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This is used by the imx-ddrc devfreq driver to implement dynamic
frequency scaling of DRAM.

Add a devfreq-event link to the dram PMU in order to support on-demand
scaling of ddrc based on measured dram bandwidth usage.

Support for proactive scaling via interconnect will come later. The
high-performance bus masters which need that (display, vpu, gpu) are not
yet enabled in upstream anyway.

Signed-off-by: Leonard Crestez <leonard.crestez@xxxxxxx>
---
 arch/arm64/boot/dts/freescale/imx8mm-evk.dts  | 18 ++++++++++++++
 arch/arm64/boot/dts/freescale/imx8mm.dtsi     | 13 +++++++++-
 .../boot/dts/freescale/imx8mn-ddr4-evk.dts    | 18 ++++++++++++++
 arch/arm64/boot/dts/freescale/imx8mn.dtsi     | 13 +++++++++-
 arch/arm64/boot/dts/freescale/imx8mq-evk.dts  | 24 +++++++++++++++++++
 arch/arm64/boot/dts/freescale/imx8mq.dtsi     | 13 +++++++++-
 6 files changed, 96 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
index 28ab17a277bb..ecf0d385c164 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
@@ -75,10 +75,28 @@
 
 &A53_0 {
 	cpu-supply = <&buck2_reg>;
 };
 
+&ddrc {
+	operating-points-v2 = <&ddrc_opp_table>;
+
+	ddrc_opp_table: opp-table {
+		compatible = "operating-points-v2";
+
+		opp-25M {
+			opp-hz = /bits/ 64 <25000000>;
+		};
+		opp-100M {
+			opp-hz = /bits/ 64 <100000000>;
+		};
+		opp-750M {
+			opp-hz = /bits/ 64 <750000000>;
+		};
+	};
+};
+
 &fec1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_fec1>;
 	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy0>;
diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
index 6edbdfe2d0d7..0fffc6362c43 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
@@ -856,11 +856,22 @@
 			#interrupt-cells = <3>;
 			interrupt-controller;
 			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
-		ddr-pmu@3d800000 {
+		ddrc: dram-controller@3d400000 {
+			compatible = "fsl,imx8mm-ddrc", "fsl,imx8m-ddrc";
+			reg = <0x3d400000 0x400000>;
+			clock-names = "core", "pll", "alt", "apb";
+			clocks = <&clk IMX8MM_CLK_DRAM_CORE>,
+				 <&clk IMX8MM_DRAM_PLL>,
+				 <&clk IMX8MM_CLK_DRAM_ALT>,
+				 <&clk IMX8MM_CLK_DRAM_APB>;
+			devfreq-events = <&ddr_pmu>;
+		};
+
+		ddr_pmu: ddr-pmu@3d800000 {
 			compatible = "fsl,imx8mm-ddr-pmu", "fsl,imx8m-ddr-pmu";
 			reg = <0x3d800000 0x400000>;
 			interrupt-parent = <&gic>;
 			interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
 		};
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
index 071949412caf..b051c927c11e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
@@ -15,10 +15,28 @@
 
 &A53_0 {
 	cpu-supply = <&buck2_reg>;
 };
 
+&ddrc {
+	operating-points-v2 = <&ddrc_opp_table>;
+
+	ddrc_opp_table: opp-table {
+		compatible = "operating-points-v2";
+
+		opp-25M {
+			opp-hz = /bits/ 64 <25000000>;
+		};
+		opp-100M {
+			opp-hz = /bits/ 64 <100000000>;
+		};
+		opp-600M {
+			opp-hz = /bits/ 64 <600000000>;
+		};
+	};
+};
+
 &i2c1 {
 	pmic@4b {
 		compatible = "rohm,bd71847";
 		reg = <0x4b>;
 		pinctrl-0 = <&pinctrl_pmic>;
diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
index e91625063f8e..c952bfb906a7 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -757,11 +757,22 @@
 			#interrupt-cells = <3>;
 			interrupt-controller;
 			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
-		ddr-pmu@3d800000 {
+		ddrc: dram-controller@3d400000 {
+			compatible = "fsl,imx8mn-ddrc", "fsl,imx8m-ddrc";
+			reg = <0x3d400000 0x400000>;
+			clock-names = "core", "pll", "alt", "apb";
+			clocks = <&clk IMX8MN_CLK_DRAM_CORE>,
+				 <&clk IMX8MN_DRAM_PLL>,
+				 <&clk IMX8MN_CLK_DRAM_ALT>,
+				 <&clk IMX8MN_CLK_DRAM_APB>;
+			devfreq-events = <&ddr_pmu>;
+		};
+
+		ddr_pmu: ddr-pmu@3d800000 {
 			compatible = "fsl,imx8mn-ddr-pmu", "fsl,imx8m-ddr-pmu";
 			reg = <0x3d800000 0x400000>;
 			interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
 		};
 	};
diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
index c36685916683..ee6dc5f07622 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
@@ -103,10 +103,34 @@
 
 &A53_3 {
 	cpu-supply = <&buck2_reg>;
 };
 
+&ddrc {
+	operating-points-v2 = <&ddrc_opp_table>;
+
+	ddrc_opp_table: opp-table {
+		compatible = "operating-points-v2";
+
+		opp-25M {
+			opp-hz = /bits/ 64 <25000000>;
+		};
+		opp-100M {
+			opp-hz = /bits/ 64 <100000000>;
+		};
+		/*
+		 * On imx8mq B0 PLL can't be bypassed so low bus is 166M
+		 */
+		opp-166M {
+			opp-hz = /bits/ 64 <166935483>;
+		};
+		opp-800M {
+			opp-hz = /bits/ 64 <800000000>;
+		};
+	};
+};
+
 &fec1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_fec1>;
 	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy0>;
diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index 7f9319452b58..d2270e99098e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -1111,11 +1111,22 @@
 			interrupt-controller;
 			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-parent = <&gic>;
 		};
 
-		ddr-pmu@3d800000 {
+		ddrc: dram-controller@3d400000 {
+			compatible = "fsl,imx8mq-ddrc", "fsl,imx8m-ddrc";
+			reg = <0x3d400000 0x400000>;
+			clock-names = "core", "pll", "alt", "apb";
+			clocks = <&clk IMX8MQ_CLK_DRAM_CORE>,
+				 <&clk IMX8MQ_DRAM_PLL_OUT>,
+				 <&clk IMX8MQ_CLK_DRAM_ALT>,
+				 <&clk IMX8MQ_CLK_DRAM_APB>;
+			devfreq-events = <&ddr_pmu>;
+		};
+
+		ddr_pmu: ddr-pmu@3d800000 {
 			compatible = "fsl,imx8mq-ddr-pmu", "fsl,imx8m-ddr-pmu";
 			reg = <0x3d800000 0x400000>;
 			interrupt-parent = <&gic>;
 			interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
 		};
-- 
2.17.1




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