From patchwork Tue Mar 31 17:51:34 2020
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X-Patchwork-Submitter: Marek Vasut <marex@denx.de>
X-Patchwork-Id: 244679
List-Id: U-Boot discussion <u-boot.lists.denx.de>
From: marex at denx.de (Marek Vasut)
Date: Tue, 31 Mar 2020 19:51:34 +0200
Subject: [PATCH V3 12/14] ARM: dts: stm32: Repair PMIC configuration on AV96
In-Reply-To: <20200331175136.205020-1-marex@denx.de>
References: <20200331175136.205020-1-marex@denx.de>
Message-ID: <20200331175136.205020-13-marex@denx.de>

The core and vdd PMIC buck regulators were misconfigured, which caused
instability of the board and malfunction of high-speed interfaces, like
the RGMII. Configure the PMIC correctly to repair these problems. Also,
model the missing Enpirion EP53A8LQI on the DHCOR SoM as a fixed regulator.

Reviewed-by: Patrice Chotard <patrice.chotard at st.com>
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org>
Cc: Patrick Delaunay <patrick.delaunay at st.com>
Cc: Patrice Chotard <patrice.chotard at st.com>
---
V2: - Model the Enpirion EP53A8LQI on the DHCOR SoM as a fixed regulator
    - Adjust the PMIC voltages further
V3: No change
---
 arch/arm/dts/stm32mp157a-avenger96.dts | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/arch/arm/dts/stm32mp157a-avenger96.dts b/arch/arm/dts/stm32mp157a-avenger96.dts
index 8181d1fa05..97ff40144e 100644
--- a/arch/arm/dts/stm32mp157a-avenger96.dts
+++ b/arch/arm/dts/stm32mp157a-avenger96.dts
@@ -91,6 +91,17 @@
 		states = <1800000 0x1>,
 			 <2900000 0x0>;
 	};
+
+	/* Enpirion EP3A8LQI U2 on the DHCOR */
+	vdd_io: regulator-buck-io {
+		compatible = "regulator-fixed";
+		regulator-name = "buck-io";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+		regulator-boot-on;
+		vin-supply = <&vdd>;
+	};
 };
 
 &ethernet0 {
@@ -167,7 +178,7 @@
 
 			vddcore: buck1 {
 				regulator-name = "vddcore";
-				regulator-min-microvolt = <1200000>;
+				regulator-min-microvolt = <800000>;
 				regulator-max-microvolt = <1350000>;
 				regulator-always-on;
 				regulator-initial-mode = <0>;
@@ -185,8 +196,8 @@
 
 			vdd: buck3 {
 				regulator-name = "vdd";
-				regulator-min-microvolt = <3300000>;
-				regulator-max-microvolt = <3300000>;
+				regulator-min-microvolt = <2900000>;
+				regulator-max-microvolt = <2900000>;
 				regulator-always-on;
 				st,mask_reset;
 				regulator-initial-mode = <0>;
@@ -268,6 +279,7 @@
 				regulator-name = "vbus_otg";
 				interrupts = <IT_OCP_OTG 0>;
 				interrupt-parent = <&pmic>;
+				regulator-active-discharge = <1>;
 			};
 
 			vbus_sw: pwr_sw2 {
@@ -304,7 +316,7 @@
 };
 
 &pwr_regulators {
-	vdd-supply = <&vdd>;
+	vdd-supply = <&vdd_io>;
 	vdd_3v3_usbfs-supply = <&vdd_usb>;
 };