linux-kernel - [PATCH] arm64: dts: rockchip: Fix power routing to support POE

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Date:   Wed, 19 Aug 2020 00:15:05 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc:     Suniel Mahesh <sunil@...rulasolutions.com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: [PATCH] arm64: dts: rockchip: Fix power routing to support POE

When POE used, the current power routing is failing to power-up
the PMIC regulators which cause Linux boot hangs.

This patch is trying to update the power routing in order to
support Type C0 and POE powering methods.

As per the schematics, sys_12v is a common output power regulator
when type c and POE power being used. sys_12v is supplied by dc_12v
which is supplied from MP8859 in type c0 power routing and sys_12v
is supplied by MP8009 PoE PD in POE power supply routing.

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
Tested-by: Suniel Mahesh <sunil@...rulasolutions.com>
---
 .../dts/rockchip/rk3399-roc-pc-mezzanine.dts   | 18 ++++++++++++++++--
 .../arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi | 12 ++++++++++--
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-mezzanine.dts b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-mezzanine.dts
index 2acb3d500fb9..754627d97144 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-mezzanine.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-mezzanine.dts
@@ -11,6 +11,16 @@ / {
 	model = "Firefly ROC-RK3399-PC Mezzanine Board";
 	compatible = "firefly,roc-rk3399-pc-mezzanine", "rockchip,rk3399";
 
+	/* MP8009 PoE PD */
+	poe_12v: poe-12v {
+		compatible = "regulator-fixed";
+		regulator-name = "poe_12v";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+	};
+
 	vcc3v3_ngff: vcc3v3-ngff {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc3v3_ngff";
@@ -22,7 +32,7 @@ vcc3v3_ngff: vcc3v3-ngff {
 		regulator-boot-on;
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
-		vin-supply = <&dc_12v>;
+		vin-supply = <&sys_12v>;
 	};
 
 	vcc3v3_pcie: vcc3v3-pcie {
@@ -34,10 +44,14 @@ vcc3v3_pcie: vcc3v3-pcie {
 		pinctrl-0 = <&vcc3v3_pcie_en>;
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
-		vin-supply = <&dc_12v>;
+		vin-supply = <&sys_12v>;
 	};
 };
 
+&sys_12v {
+	vin-supply = <&poe_12v>;
+};
+
 &pcie_phy {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi
index b85ec31cd283..e7a459fa4322 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi
@@ -110,6 +110,14 @@ vcc_vbus_typec0: vcc-vbus-typec0 {
 		regulator-max-microvolt = <5000000>;
 	};
 
+	sys_12v: sys-12v {
+		compatible = "regulator-fixed";
+		regulator-name = "sys_12v";
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&dc_12v>;
+	};
+
 	/* switched by pmic_sleep */
 	vcc1v8_s3: vcca1v8_s3: vcc1v8-s3 {
 		compatible = "regulator-fixed";
@@ -141,7 +149,7 @@ vcc3v3_sys: vcc3v3-sys {
 		regulator-boot-on;
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
-		vin-supply = <&dc_12v>;
+		vin-supply = <&sys_12v>;
 	};
 
 	vcca_0v9: vcca-0v9 {
@@ -186,7 +194,7 @@ vcc_sys: vcc-sys {
 		regulator-boot-on;
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
-		vin-supply = <&dc_12v>;
+		vin-supply = <&sys_12v>;
 	};
 
 	vdd_log: vdd-log {
-- 
2.25.1