linux-kernel - [PATCH 2/4] ARM: dts: da850: add cpu node and operating points to DT

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Message-Id: <20190321141010.19612-3-brgl@bgdev.pl>
Date:   Thu, 21 Mar 2019 15:10:08 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Lechner <david@...hnology.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 2/4] ARM: dts: da850: add cpu node and operating points to DT

From: David Lechner <david@...hnology.com>

This adds a cpu node and operating points to the common da850.dtsi file.

Additionally, a regulator is added to the LEGO EV3 board along with
some board-specific CPU configuration.

Regulators need to be hooked up on other boards to get them working.

Signed-off-by: David Lechner <david@...hnology.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 arch/arm/boot/dts/da850-lcdk.dts     | 31 +++++++++++++++
 arch/arm/boot/dts/da850-lego-ev3.dts | 30 +++++++++++++++
 arch/arm/boot/dts/da850.dtsi         | 56 ++++++++++++++++++++++++++++
 3 files changed, 117 insertions(+)

diff --git a/arch/arm/boot/dts/da850-lcdk.dts b/arch/arm/boot/dts/da850-lcdk.dts
index 26f453dc8370..f29ed9010812 100644
--- a/arch/arm/boot/dts/da850-lcdk.dts
+++ b/arch/arm/boot/dts/da850-lcdk.dts
@@ -155,12 +155,43 @@
 			};
 		};
 	};
+
+	cvdd: regulator0 {
+		compatible = "regulator-fixed";
+		regulator-name = "cvdd";
+		regulator-min-microvolt = <1300000>;
+		regulator-max-microvolt = <1300000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
 };
 
 &ref_clk {
 	clock-frequency = <24000000>;
 };
 
+&cpu {
+	cpu-supply = <&cvdd>;
+};
+
+/* LCDK has a fixed CVDD of 1.3V, so only op points >= 300MHz are valid */
+
+&opp_100 {
+	status = "disabled";
+};
+
+&opp_200 {
+	status = "disabled";
+};
+
+&opp_375 {
+	status = "okay";
+};
+
+&opp_456 {
+	status = "okay";
+};
+
 &pmx_core {
 	status = "okay";
 
diff --git a/arch/arm/boot/dts/da850-lego-ev3.dts b/arch/arm/boot/dts/da850-lego-ev3.dts
index 66fcadf0ba91..553717f84483 100644
--- a/arch/arm/boot/dts/da850-lego-ev3.dts
+++ b/arch/arm/boot/dts/da850-lego-ev3.dts
@@ -125,6 +125,15 @@
 		amp-supply = <&amp>;
 	};
 
+	cvdd: regulator0 {
+		compatible = "regulator-fixed";
+		regulator-name = "cvdd";
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
 	/*
 	 * This is a 5V current limiting regulator that is shared by USB,
 	 * the sensor (input) ports, the motor (output) ports and the A/DC.
@@ -204,6 +213,27 @@
 	clock-frequency = <24000000>;
 };
 
+&cpu {
+	cpu-supply = <&cvdd>;
+};
+
+/* since we have a fixed regulator, we can't run at these points */
+&opp_100 {
+	status = "disabled";
+};
+
+&opp_200 {
+	status = "disabled";
+};
+
+/*
+ * The SoC is actually the 456MHz version, but because of the fixed regulator
+ * This is the fastest we can go.
+ */
+&opp_375 {
+	status = "okay";
+};
+
 &pmx_core {
 	status = "okay";
 
diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
index 559659b399d0..ee61d1253b58 100644
--- a/arch/arm/boot/dts/da850.dtsi
+++ b/arch/arm/boot/dts/da850.dtsi
@@ -20,6 +20,62 @@
 		reg = <0xc0000000 0x0>;
 	};
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu: cpu@0 {
+			compatible = "arm,arm926ej-s";
+			device_type = "cpu";
+			reg = <0>;
+			clocks = <&psc0 14>;
+			operating-points-v2 = <&opp_table>;
+		};
+	};
+
+	opp_table: opp-table {
+		compatible = "operating-points-v2";
+
+		opp_100: opp100-100000000 {
+			opp-hz = /bits/ 64 <100000000>;
+			opp-microvolt = <1000000 950000 1050000>;
+		};
+
+		opp_200: opp110-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			opp-microvolt = <1100000 1050000 1160000>;
+		};
+
+		opp_300: opp120-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+			opp-microvolt = <1200000 1140000 1320000>;
+		};
+
+		/*
+		 * Original silicon was 300MHz max, so higher frequencies
+		 * need to be enabled on a per-board basis if the chip is
+		 * capable.
+		 */
+
+		opp_375: opp120-375000000 {
+			status = "disabled";
+			opp-hz = /bits/ 64 <375000000>;
+			opp-microvolt = <1200000 1140000 1320000>;
+		};
+
+		opp_415: opp130-415000000 {
+			status = "disabled";
+			opp-hz = /bits/ 64 <415000000>;
+			opp-microvolt = <1300000 1250000 1350000>;
+		};
+
+		opp_456: opp130-456000000 {
+			status = "disabled";
+			opp-hz = /bits/ 64 <456000000>;
+			opp-microvolt = <1300000 1250000 1350000>;
+		};
+	};
+
 	arm {
 		#address-cells = <1>;
 		#size-cells = <1>;
-- 
2.20.1