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hwmon: (ltc2978) Add support for LTC3887

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LTC3887 is an enhanced version of LTC3880 and supports the same commands.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2015-08-07 09:06:37 -07:00
parent e8047a2686
commit 15398566f0
4 changed files with 29 additions and 13 deletions
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1
Documentation/devicetree/bindings/hwmon/ltc2978.txt
View file

@ -8,6 +8,7 @@ Required properties:
* "lltc,ltc3880"
* "lltc,ltc3882"
* "lltc,ltc3883"
* "lltc,ltc3887"
* "lltc,ltm4676"
- reg: I2C slave address

19
Documentation/hwmon/ltc2978
View file

@ -27,6 +27,10 @@ Supported chips:
Prefix: 'ltc3883'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc3883
* Linear Technology LTC3887
Prefix: 'ltc3887'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc3887
* Linear Technology LTM4676
Prefix: 'ltm4676'
Addresses scanned: -
@ -41,7 +45,8 @@ Description
LTC2974 is a quad digital power supply managers.
LTC2978 is an octal power supply monitor.
LTC2977 is a pin compatible replacement for LTC2978.
LTC3880 and LTC3882 are dual output poly-phase step-down DC/DC controllers.
LTC3880, LTC3882, and LTC3887 are dual output poly-phase step-down DC/DC
controllers.
LTC3883 is a single phase step-down DC/DC controller.
LTM4676 is a dual 13A or single 26A uModule regulator.
@ -85,7 +90,7 @@ in[N]_label "vout[1-8]".
LTC2974: N=2-5
LTC2977: N=2-9
LTC2978: N=2-9
LTC3880, LTC3882, LTM4676: N=2-3
LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
LTC3883: N=2
in[N]_input Measured output voltage.
in[N]_min Minimum output voltage.
@ -105,8 +110,8 @@ temp[N]_input Measured temperature.
and temp5 reports the chip temperature.
On LTC2977 and LTC2978, only one temperature measurement
is supported and reports the chip temperature.
On LTC3880, LTC3882, and LTM4676, temp1 and temp2
report external temperatures, and temp3 reports
On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and
temp2 report external temperatures, and temp3 reports
the chip temperature.
On LTC3883, temp1 reports an external temperature,
and temp2 reports the chip temperature.
@ -134,11 +139,11 @@ power[N]_label "pout[1-4]".
LTC2974: N=1-4
LTC2977: Not supported
LTC2978: Not supported
LTC3880, LTC3882, LTM4676: N=1-2
LTC3880, LTC3882, LTC3887, LTM4676: N=1-2
LTC3883: N=2
power[N]_input Measured output power.
curr1_label "iin". LTC3880, LTC3883, and LTM4676 only.
curr1_label "iin". LTC3880, LTC3883, LTC3887, and LTM4676 only.
curr1_input Measured input current.
curr1_max Maximum input current.
curr1_max_alarm Input current high alarm.
@ -149,7 +154,7 @@ curr[N]_label "iout[1-4]".
LTC2974: N=1-4
LTC2977: not supported
LTC2978: not supported
LTC3880, LTC3882, LTM4676: N=2-3
LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
LTC3883: N=2
curr[N]_input Measured output current.
curr[N]_max Maximum output current.

3
drivers/hwmon/pmbus/Kconfig
View file

@ -52,7 +52,8 @@ config SENSORS_LTC2978
default n
help
If you say yes here you get hardware monitoring support for Linear
Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, and LTM4676.
Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTC3887,
and LTM4676.
This driver can also be built as a module. If so, the module will
be called ltc2978.

19
drivers/hwmon/pmbus/ltc2978.c
View file

@ -1,6 +1,6 @@
/*
* Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,
* LTC3883, and LTM4676
* LTC3883, LTC3887. and LTM4676
*
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013, 2014 Guenter Roeck
@ -25,7 +25,8 @@
#include <linux/regulator/driver.h>
#include "pmbus.h"
enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltm4676 };
enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,
ltm4676 };
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
@ -42,7 +43,7 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltm4676 };
#define LTC2974_MFR_IOUT_PEAK 0xd7
#define LTC2974_MFR_IOUT_MIN 0xd8
/* LTC3880, LTC3882, LTC3883, and LTM4676 */
/* LTC3880, LTC3882, LTC3883, LTC3887, and LTM4676 */
#define LTC3880_MFR_IOUT_PEAK 0xd7
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
@ -60,9 +61,11 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltm4676 };
#define LTC3880_ID_MASK 0xff00
#define LTC3883_ID 0x4300
#define LTC3883_ID_MASK 0xff00
#define LTC3887_ID 0x4700
#define LTC3887_ID_MASK 0xff00
#define LTM4676_ID 0x4400
#define LTM4676_ID_2 0x4480
#define LTM4676A_ID 0x47E0
#define LTM4676A_ID 0x47e0
#define LTM4676_ID_MASK 0xfff0
#define LTC2974_NUM_PAGES 4
@ -315,7 +318,8 @@ static int ltc2978_clear_peaks(struct i2c_client *client, int page,
{
int ret;
if (id == ltc3880 || id == ltc3882 || id == ltc3883 || id == ltm4676)
if (id == ltc3880 || id == ltc3882 || id == ltc3883 || id == ltc3887 ||
id == ltm4676)
ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
else
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
@ -373,6 +377,7 @@ static const struct i2c_device_id ltc2978_id[] = {
{"ltc3880", ltc3880},
{"ltc3882", ltc3882},
{"ltc3883", ltc3883},
{"ltc3887", ltc3887},
{"ltm4676", ltm4676},
{}
};
@ -432,6 +437,8 @@ static int ltc2978_get_id(struct i2c_client *client)
return ltc3880;
else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID)
return ltc3883;
else if ((chip_id & LTC3887_ID_MASK) == LTC3887_ID)
return ltc3887;
else if ((chip_id & LTM4676_ID_MASK) == LTM4676_ID ||
(chip_id & LTM4676_ID_MASK) == LTM4676_ID_2 ||
(chip_id & LTM4676_ID_MASK) == LTM4676A_ID)
@ -511,6 +518,7 @@ static int ltc2978_probe(struct i2c_client *client,
}
break;
case ltc3880:
case ltc3887:
case ltm4676:
info->read_word_data = ltc3880_read_word_data;
info->pages = LTC3880_NUM_PAGES;
@ -573,6 +581,7 @@ static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,ltc3880" },
{ .compatible = "lltc,ltc3882" },
{ .compatible = "lltc,ltc3883" },
{ .compatible = "lltc,ltc3887" },
{ .compatible = "lltc,ltm4676" },
{ }
};