100 lines
3.2 KiB
Groff
100 lines
3.2 KiB
Groff
.\" $NetBSD: tps65217pmic.4,v 1.10 2018/06/28 22:00:50 wiz Exp $
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.\"
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.\" Copyright (c) 2013 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Radoslaw Kujawa.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd June 28, 2018
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.Dt TPS65217PMIC 4
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.Os
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.Sh NAME
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.Nm tps65217pmic
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.Nd Texas Instruments TPS65217 Power Management IC driver
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.Sh SYNOPSIS
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.Cd "tps65217pmic0 at iic? addr 0x24"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides minimal support for the TPS65217 chip and allows reporting
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regulated voltages through the
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.Xr envsys 4
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API.
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.Pp
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The TPS65217 consists of low-dropout regulators (LDO) and step-down converters
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with integrated switching FETs (DCDC):
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.Bl -bullet -compact
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.It
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LDO1: 1.0V - 3.3V
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.It
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LDO2: 0.9V - 3.3V
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.It
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LDO3: 1.5V - 3.3V
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.It
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LDO4: 1.5V - 3.3V
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.It
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DCDC1: 0.9V - 1.8V
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.It
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DCDC2: 0.9V - 3.3V
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.It
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DCDC1: 0.9V - 1.5V
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.El
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.Sh SEE ALSO
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.Xr envsys 4
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.Sh HISTORY
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The
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.Nm
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device first appeared in
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.Nx 7.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com .
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Voltage change callback for AM335x was added by
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.An Manuel Bouyer .
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White LED (backlight) support was added by
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.An KIYOHARA Takashi .
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.Sh CAVEATS
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The driver can only report current voltage regulator settings.
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It can not measure the real voltage, as the TPS65217 chip lacks hardware to do
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that.
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Some boards allow voltage measurement by connecting the power output to
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external sensor, or analog input of the MPU, but this is outside of the
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scope of this driver.
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.Pp
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Modifying voltage regulator parameters from user space was deliberately left
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unimplemented, as these parameters should only be set at the firmware or
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kernel level.
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Setting wrong parameters may result in permanent hardware damage.
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.Pp
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The
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.Nm
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driver offers a function that can be used to change the voltage from other
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kernel components (currently used by AM335x support code).
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.Sh BUGS
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Battery and interrupt support is not implemented.
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