diff mbox series

[3/4] ARM: dts: imx6ul: phycore: Change USB LDO voltage for usb compliance

Message ID 20211201125327.3704500-4-andrej.picej@norik.com (mailing list archive)
State New, archived
Headers show
Series PHYTEC i.MX 6UL/ULL devicetree patches | expand

Commit Message

Andrej Picej Dec. 1, 2021, 12:53 p.m. UTC 
From: Yunus Bas <y.bas@phytec.de>

According to the NXP usb compliance reference, the USB data lines for
Full/Low speed are connected to the ARM USB LDO, which is set to
minimum-voltage = 2.6V and maximum-voltage = 3.4 V. When the regulator
is deactivated, the data lines are defaulty driven with 2.6V, which is
not USB Full-Speed compliant. To be compliant, we need to activate the
USB LDO regulator and set it to the value of 3V, which is the specified
value in the USB specification.

Signed-off-by: Yunus Bas <y.bas@phytec.de>
Signed-off-by: Andrej Picej <andrej.picej@norik.com>
---
 arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi b/arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi
index 3cddc68917a0..2e03be3d43ec 100644
--- a/arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi
+++ b/arch/arm/boot/dts/imx6ul-phytec-phycore-som.dtsi
@@ -83,6 +83,11 @@  eeprom@52 {
 	};
 };
 
+&reg_3p0 {
+	regulator-min-microvolt = <3000000>;
+	regulator-always-on;
+};
+
 &snvs_poweroff {
 	status = "okay";
 };