linux-kernel - [PATCH v5 3/5] ARM: dts: da850-lcdk: enable cpufreq

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Date:   Wed, 17 Apr 2019 17:26:59 +0200
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>,
        Adam Ford <aford173@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v5 3/5] ARM: dts: da850-lcdk: enable cpufreq

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

Add a fixed regulator for the da850-lcdk board along with board-specific
CPU configuration.

Signed-off-by: David Lechner <david@...hnology.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 arch/arm/boot/dts/da850-lcdk.dts | 36 ++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm/boot/dts/da850-lcdk.dts b/arch/arm/boot/dts/da850-lcdk.dts
index 26f453dc8370..b36d5e36bcf1 100644
--- a/arch/arm/boot/dts/da850-lcdk.dts
+++ b/arch/arm/boot/dts/da850-lcdk.dts
@@ -155,12 +155,48 @@
 			};
 		};
 	};
+
+	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 operating points >= 300MHz are
+ * valid. Unfortunately due to a problem with the DA8XX OHCI controller, we
+ * can't enable more than one OPP by default, since the controller sometimes
+ * becomes unresponsive after a transition. Fix the frequency at 456 MHz.
+ */
+
+&opp_100 {
+	status = "disabled";
+};
+
+&opp_200 {
+	status = "disabled";
+};
+
+&opp_300 {
+	status = "disabled";
+};
+
+&opp_456 {
+	status = "okay";
+};
+
 &pmx_core {
 	status = "okay";
 
-- 
2.21.0