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 | 17 ++++++++++++-
.../boot/dts/freescale/imx8mn-ddr4-evk.dts | 18 ++++++++++++++
arch/arm64/boot/dts/freescale/imx8mn.dtsi | 16 ++++++++++++-
arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 24 +++++++++++++++++++
arch/arm64/boot/dts/freescale/imx8mq.dtsi | 16 ++++++++++++-
6 files changed, 106 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
index 4f5e408d6e6a..be9abd8e4478 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
@@ -69,16 +69,34 @@
simple-audio-card,codec {
sound-dai = <&wm8524>;
clocks = <&clk IMX8MM_CLK_SAI3_ROOT>;
};
};
+
+ ddrc_opp_table: ddrc-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>;
+ };
+ };
};
&A53_0 {
cpu-supply = <&buck2_reg>;
};
+&ddrc {
+ operating-points-v2 = <&ddrc_opp_table>;
+};
+
&fec1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec1>;
phy-mode = "rgmii-id";
phy-handle = <ðphy0>;
diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
index 6edbdfe2d0d7..5404870d80d5 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
@@ -856,11 +856,26 @@
#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 = "dram_core",
+ "dram_pll",
+ "dram_alt",
+ "dram_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>;
+ operating-points-v2 = <&ddrc_opp_table>;
+ };
+
+ 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..ab2060667671 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
@@ -9,16 +9,34 @@
#include "imx8mn-evk.dtsi"
/ {
model = "NXP i.MX8MNano DDR4 EVK board";
compatible = "fsl,imx8mn-ddr4-evk", "fsl,imx8mn";
+
+ ddrc_opp_table: ddrc-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>;
+ };
+ };
};
&A53_0 {
cpu-supply = <&buck2_reg>;
};
+&ddrc {
+ operating-points-v2 = <&ddrc_opp_table>;
+};
+
&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..344dd777635f 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -757,11 +757,25 @@
#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 = "dram_core",
+ "dram_pll",
+ "dram_alt",
+ "dram_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..fc4c12ab8991 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
@@ -85,10 +85,30 @@
link_codec: simple-audio-card,codec {
sound-dai = <&wm8524>;
clocks = <&clk IMX8MQ_CLK_SAI2_ROOT>;
};
};
+
+ ddrc_opp_table: ddrc-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>;
+ };
+ };
};
&A53_0 {
cpu-supply = <&buck2_reg>;
};
@@ -103,10 +123,14 @@
&A53_3 {
cpu-supply = <&buck2_reg>;
};
+&ddrc {
+ operating-points-v2 = <&ddrc_opp_table>;
+};
+
&fec1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec1>;
phy-mode = "rgmii-id";
phy-handle = <ðphy0>;
diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index 7f9319452b58..6ef1af41ef68 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -1111,11 +1111,25 @@
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 = "dram_core",
+ "dram_pll",
+ "dram_alt",
+ "dram_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
