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From: Leonard Crestez <leonard.crestez@nxp.com>
To: Stephen Boyd <sboyd@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
	MyungJoo Ham <myungjoo.ham@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Rob Herring <robh+dt@kernel.org>
Cc: "Kyungmin Park" <kyungmin.park@samsung.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Michael Turquette" <mturquette@baylibre.com>,
	"Artur Świgoń" <a.swigon@partner.samsung.com>,
	"Saravana Kannan" <saravanak@google.com>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Alexandre Bailon" <abailon@baylibre.com>,
	"Georgi Djakov" <georgi.djakov@linaro.org>,
	"Dong Aisheng" <aisheng.dong@nxp.com>,
	"Abel Vesa" <abel.vesa@nxp.com>, "Jacky Bai" <ping.bai@nxp.com>,
	"Anson Huang" <Anson.Huang@nxp.com>,
	"Fabio Estevam" <fabio.estevam@nxp.com>,
	"Viresh Kumar" <viresh.kumar@linaro.org>,
	devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-imx@nxp.com,
	kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 7/7] arm64: dts: imx8mm: Add devfreq nodes
Date: Tue, 20 Aug 2019 18:45:12 +0300
Message-ID: <71f9ecb1152b1860399e59aacb22c467d519b0f5.1566315740.git.leonard.crestez@nxp.com> (raw)
In-Reply-To: <cover.1566315740.git.leonard.crestez@nxp.com>
In-Reply-To: <cover.1566315740.git.leonard.crestez@nxp.com>

Add initial support for bus scaling on imx8m, starting with noc and ddrc
because they're the biggest power hogs.

Add a devfreq-event link to the PMU in order to support on-demand
scaling of ddrc based on measured dram bandwith usage. Make ddrc a
parent of the NOC because all traffic to ddrc goes through

Support for proactive scaling via interconnect and support for scaling
additional NICs 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@nxp.com>
---
 arch/arm64/boot/dts/freescale/imx8mm.dtsi | 53 ++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
index 5f9d0da196e1..5474c50784c2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
@@ -139,10 +139,38 @@
 			clock-latency-ns = <150000>;
 			opp-suspend;
 		};
 	};
 
+	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>;
+		};
+	};
+
+	noc_opp_table: noc-opp-table {
+		compatible = "operating-points-v2";
+
+		opp-150M {
+			opp-hz = /bits/ 64 <150000000>;
+		};
+		opp-375M {
+			opp-hz = /bits/ 64 <375000000>;
+		};
+		opp-750M {
+			opp-hz = /bits/ 64 <750000000>;
+		};
+	};
+
 	memory@40000000 {
 		device_type = "memory";
 		reg = <0x0 0x40000000 0 0x80000000>;
 	};
 
@@ -773,10 +801,18 @@
 				status = "disabled";
 			};
 
 		};
 
+		noc: noc@32700000 {
+			compatible = "fsl,imx8mm-noc", "fsl,imx8m-noc";
+			reg = <0x32700000 0x100000>;
+			clocks = <&clk IMX8MM_CLK_NOC>;
+			devfreq = <&ddrc>;
+			operating-points-v2 = <&noc_opp_table>;
+		};
+
 		aips4: bus@32c00000 {
 			compatible = "fsl,aips-bus", "simple-bus";
 			#address-cells = <1>;
 			#size-cells = <1>;
 			ranges = <0x32c00000 0x32c00000 0x400000>;
@@ -857,11 +893,26 @@
 			#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>;
 		};
-- 
2.17.1


      parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 15:45 [PATCH v2 0/7] PM / devfreq: Add initial imx support Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 1/7] clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram_alt/apb Leonard Crestez
     [not found]   ` <20190916203312.CF8D02067B@mail.kernel.org>
2019-09-16 23:03     ` Leonard Crestez
     [not found]       ` <20190917163215.A838020665@mail.kernel.org>
2019-09-17 16:59         ` Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 2/7] dt-bindings: devfreq: Add bindings for generic imx buses Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 3/7] PM / devfreq: Add generic imx bus driver Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 4/7] dt-bindings: devfreq: Add bindings for imx ddr controller Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 5/7] PM / devfreq: Add dynamic scaling " Leonard Crestez
2019-08-20 15:45 ` [PATCH v2 6/7] PM / devfreq: imx-ddrc: Measure bandwidth with perf Leonard Crestez
2019-08-20 15:45 ` Leonard Crestez [this message]

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