78 lines
2.2 KiB
Diff
78 lines
2.2 KiB
Diff
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From 4729b2a505cf18d16d484af5deb8627f937b773d Mon Sep 17 00:00:00 2001
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From: Sergey Larin <cerg2010cerg2010@mail.ru>
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Date: Thu, 20 Jun 2019 20:31:45 +0300
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Subject: [PATCH] ARM: dts: tegra20-glide: USB OTG bindings
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OTG here is provided by ChipIdea controller, which uses OTG FSM to
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power on the connected device. However, OTG specification says that
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the device needs to receive power in 100ms, but this is not a strict
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requirement. We need to disable the charger first and then power on VBUS,
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which is slow process so we set a delay for the regulator to workaround
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this.
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Signed-off-by: Sergey Larin <cerg2010cerg2010@mail.ru>
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---
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arch/arm/boot/dts/tegra20-glide.dts | 25 ++++++++++++++++++++++---
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1 file changed, 22 insertions(+), 3 deletions(-)
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diff --git a/arch/arm/boot/dts/tegra20-glide.dts b/arch/arm/boot/dts/tegra20-glide.dts
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index 0c6a903ef0c7..56e5407b2f42 100644
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--- a/arch/arm/boot/dts/tegra20-glide.dts
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+++ b/arch/arm/boot/dts/tegra20-glide.dts
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@@ -1520,15 +1520,28 @@
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};
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};
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+ /*
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+ * There's funny thing going on with OTG power
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+ * which I don't know how to fix properly.
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+ * When the OTG cable is plugged in, USB
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+ * controller detects this and enables VBUS
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+ * power. However, charger thinks that the
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+ * charging cable is plugged in and enables
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+ * charging. After that there's no power on
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+ * the port :)
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+ *
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+ * So we use a bit modified driver with "dummy"
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+ * regulator which disables charging when enabled.
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+ */
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usb@c5000000 {
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compatible = "nvidia,tegra20-udc";
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status = "okay";
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- dr_mode = "otg";
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- vbus-supply = <&vbus_reg>;
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+ vbus-supply = <&otg_reg>;
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};
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usb-phy@c5000000 {
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status = "okay";
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+ dr_mode = "otg";
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vbus-supply = <&usb_phy_reg>;
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};
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@@ -1708,7 +1721,7 @@
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enable-active-high;
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};
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- vbus_reg: regulator@3 {
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+ otg_reg: regulator@3 {
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compatible = "regulator-fixed";
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reg = <3>;
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regulator-name = "otg-en";
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@@ -1716,6 +1729,12 @@
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regulator-max-microvolt = <5000000>;
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gpio = <&gpio TEGRA_GPIO(R, 7) GPIO_ACTIVE_HIGH>;
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enable-active-high;
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+ /*
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+ * CI HDRC controller requires delay in 100ms, but
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+ * this thing is so slow!
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+ */
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+ regulator-enable-ramp-delay = <350000>;
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+ vin-supply = <&charger_supply>;
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};
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gps_en: regulator@4 {
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--
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2.22.0
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