ARM: dts: stm32: Repair PMIC configuration on AV96

The vdd PMIC buck regulator was 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 add missing
Enpirion regulator for the IO voltage into the DT.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

diff --git a/arch/arm/boot/dts/stm32mp157a-avenger96.dts b/arch/arm/boot/dts/stm32mp157a-avenger96.dts
index aba3895..380ce14 100644 (file)
--- a/arch/arm/boot/dts/stm32mp157a-avenger96.dts
+++ b/arch/arm/boot/dts/stm32mp157a-avenger96.dts
@@ -77,6 +77,17 @@
                        default-state = "off";
                };
        };
+
+       /* 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 {
@@ -166,8 +177,8 @@
 
                        vdd: buck3 {
                                regulator-name = "vdd";
-                               regulator-min-microvolt = <3300000>;
-                               regulator-max-microvolt = <3300000>;
+                               regulator-min-microvolt = <2900000>;
+                               regulator-max-microvolt = <2900000>;
                                regulator-always-on;
                                regulator-initial-mode = <0>;
                                regulator-over-current-protection;
@@ -245,6 +256,7 @@
                                regulator-name = "vbus_otg";
                                interrupts = <IT_OCP_OTG 0>;
                                interrupt-parent = <&pmic>;
+                               regulator-active-discharge = <1>;
                        };
 
                        vbus_sw: pwr_sw2 {
@@ -275,7 +287,7 @@
 };
 
 &pwr_regulators {
-       vdd-supply = <&vdd>;
+       vdd-supply = <&vdd_io>;
        vdd_3v3_usbfs-supply = <&vdd_usb>;
 };