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drivers: hwmon: (pmbus/ltc2978) Add support for LTM4686 uModule

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This patch adds support for LTM4686 Ultrathin Dual 10A or
Single 20A uModule Regulator with Digital Power System Management.

Datasheet: http://www.analog.com/ltm4686

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Michael Hennerich 2018-08-14 14:18:28 +02:00 committed by Guenter Roeck
parent 0238df646e
commit 4e15d05d9c
4 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/hwmon/ltc2978.txt
View File

@ -15,6 +15,7 @@ Required properties:
* "lltc,ltm2987"
* "lltc,ltm4675"
* "lltc,ltm4676"
* "lltc,ltm4686"
- reg: I2C slave address
Optional properties:
@ -30,6 +31,7 @@ Valid names of regulators depend on number of supplies supported per device:
* ltc3880, ltc3882, ltc3886 : vout0 - vout1
* ltc3883 : vout0
* ltm4676 : vout0 - vout1
* ltm4686 : vout0 - vout1
Example:
ltc2978@5e {

5
Documentation/hwmon/ltc2978
View File

@ -55,6 +55,10 @@ Supported chips:
Prefix: 'ltm4676'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltm4676
* Analog Devices LTM4686
Prefix: 'ltm4686'
Addresses scanned: -
Datasheet: http://www.analog.com/ltm4686
Author: Guenter Roeck <linux@roeck-us.net>
@ -76,6 +80,7 @@ additional components on a single die. The chip is instantiated and reported
as two separate chips on two different I2C bus addresses.
LTM4675 is a dual 9A or single 18A μModule regulator
LTM4676 is a dual 13A or single 26A uModule regulator.
LTM4686 is a dual 10A or single 20A uModule regulator.
Usage Notes

3
drivers/hwmon/pmbus/Kconfig
View File

@ -83,7 +83,8 @@ config SENSORS_LTC2978_REGULATOR
depends on SENSORS_LTC2978 && REGULATOR
help
If you say yes here you get regulator support for Linear
Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, and LTM4676.
Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTM4676
and LTM4686.
config SENSORS_LTC3815
tristate "Linear Technologies LTC3815"

9
drivers/hwmon/pmbus/ltc2978.c
View File

@ -4,6 +4,7 @@
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013, 2014, 2015 Guenter Roeck
* Copyright (c) 2015 Linear Technology
* Copyright (c) 2018 Analog Devices Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -28,7 +29,7 @@
#include "pmbus.h"
enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
ltc3883, ltc3886, ltc3887, ltm2987, ltm4675, ltm4676 };
ltc3883, ltc3886, ltc3887, ltm2987, ltm4675, ltm4676, ltm4686 };
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
@ -81,6 +82,7 @@ enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
#define LTM4676_ID_REV1 0x4400
#define LTM4676_ID_REV2 0x4480
#define LTM4676A_ID 0x47e0
#define LTM4686_ID 0x4770
#define LTC2974_NUM_PAGES 4
#define LTC2978_NUM_PAGES 8
@ -512,6 +514,7 @@ static const struct i2c_device_id ltc2978_id[] = {
{"ltm2987", ltm2987},
{"ltm4675", ltm4675},
{"ltm4676", ltm4676},
{"ltm4686", ltm4686},
{}
};
MODULE_DEVICE_TABLE(i2c, ltc2978_id);
@ -588,6 +591,8 @@ static int ltc2978_get_id(struct i2c_client *client)
else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
chip_id == LTM4676A_ID)
return ltm4676;
else if (chip_id == LTM4686_ID)
return ltm4686;
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
return -ENODEV;
@ -684,6 +689,7 @@ static int ltc2978_probe(struct i2c_client *client,
case ltc3887:
case ltm4675:
case ltm4676:
case ltm4686:
data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
info->read_word_data = ltc3880_read_word_data;
info->pages = LTC3880_NUM_PAGES;
@ -770,6 +776,7 @@ static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,ltm2987" },
{ .compatible = "lltc,ltm4675" },
{ .compatible = "lltc,ltm4676" },
{ .compatible = "lltc,ltm4686" },
{ }
};
MODULE_DEVICE_TABLE(of, ltc2978_of_match);