From: Andrej Picej <andrej.picej@norik.com>
To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
soc@kernel.org
Cc: robh+dt@kernel.org, kernel@pengutronix.de, shawnguo@kernel.org,
leoyang.li@nxp.com, krzysztof.kozlowski@canonical.com,
linux@rempel-privat.de, festevam@gmail.com, arnd@arndb.de,
linux-imx@nxp.com, andrej.picej@norik.com, y.bas@phytec.de
Subject: [PATCH 3/4] ARM: dts: imx6ul: phycore: Change USB LDO voltage for usb compliance
Date: Wed, 1 Dec 2021 13:53:26 +0100 [thread overview]
Message-ID: <20211201125327.3704500-4-andrej.picej@norik.com> (raw)
In-Reply-To: <20211201125327.3704500-1-andrej.picej@norik.com>
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 --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 {
};
};
+®_3p0 {
+ regulator-min-microvolt = <3000000>;
+ regulator-always-on;
+};
+
&snvs_poweroff {
status = "okay";
};
--
2.25.1
next prev parent reply other threads:[~2021-12-01 12:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-01 12:53 [PATCH 0/4] PHYTEC i.MX 6UL/ULL devicetree patches Andrej Picej
2021-12-01 12:53 ` [PATCH 1/4] dt-bindings: arm: fsl: add PHYTEC phyGATE Tauri i.MX6 ULL Andrej Picej
2021-12-13 19:15 ` Rob Herring
2021-12-16 8:45 ` Andrej Picej
2021-12-01 12:53 ` [PATCH 2/4] ARM: dts: imx6ull: Add support for PHYTEC phyGATE-Tauri-S with i.MX 6ULL Andrej Picej
2021-12-01 12:53 ` Andrej Picej [this message]
2021-12-01 12:53 ` [PATCH 4/4] ARM: dts: imx6ul: peb-av-02: move to 3 cell pwm Andrej Picej
2021-12-13 16:13 ` [PATCH 0/4] PHYTEC i.MX 6UL/ULL devicetree patches Arnd Bergmann
2021-12-16 7:13 ` Andrej Picej
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