1.\" $NetBSD: tps65217pmic.4,v 1.10 2018/06/28 22:00:50 wiz Exp $ 2.\" 3.\" Copyright (c) 2013 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Radoslaw Kujawa. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd June 28, 2018 31.Dt TPS65217PMIC 4 32.Os 33.Sh NAME 34.Nm tps65217pmic 35.Nd Texas Instruments TPS65217 Power Management IC driver 36.Sh SYNOPSIS 37.Cd "tps65217pmic0 at iic? addr 0x24" 38.Sh DESCRIPTION 39The 40.Nm 41driver provides minimal support for the TPS65217 chip and allows reporting 42regulated voltages through the 43.Xr envsys 4 44API. 45.Pp 46The TPS65217 consists of low-dropout regulators (LDO) and step-down converters 47with integrated switching FETs (DCDC): 48.Bl -bullet -compact 49.It 50LDO1: 1.0V - 3.3V 51.It 52LDO2: 0.9V - 3.3V 53.It 54LDO3: 1.5V - 3.3V 55.It 56LDO4: 1.5V - 3.3V 57.It 58DCDC1: 0.9V - 1.8V 59.It 60DCDC2: 0.9V - 3.3V 61.It 62DCDC1: 0.9V - 1.5V 63.El 64.Sh SEE ALSO 65.Xr envsys 4 66.Sh HISTORY 67The 68.Nm 69device first appeared in 70.Nx 7.0 . 71.Sh AUTHORS 72.An -nosplit 73The 74.Nm 75driver was written by 76.An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com . 77Voltage change callback for AM335x was added by 78.An Manuel Bouyer . 79White LED (backlight) support was added by 80.An KIYOHARA Takashi . 81.Sh CAVEATS 82The driver can only report current voltage regulator settings. 83It can not measure the real voltage, as the TPS65217 chip lacks hardware to do 84that. 85Some boards allow voltage measurement by connecting the power output to 86external sensor, or analog input of the MPU, but this is outside of the 87scope of this driver. 88.Pp 89Modifying voltage regulator parameters from user space was deliberately left 90unimplemented, as these parameters should only be set at the firmware or 91kernel level. 92Setting wrong parameters may result in permanent hardware damage. 93.Pp 94The 95.Nm 96driver offers a function that can be used to change the voltage from other 97kernel components (currently used by AM335x support code). 98.Sh BUGS 99Battery and interrupt support is not implemented. 100