LTC3882 is mostly compatible with LTC3880. Major differences are that it
does not measure the input current, and it no longer supports LTC's legacy
mechanism to identify the chip.
Cc: Ananda Babu Nettam <anandab@xxxxxxxxxxx>
Cc: Amit U Jain <amjain@xxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
.../devicetree/bindings/hwmon/ltc2978.txt | 3 +-
Documentation/hwmon/ltc2978 | 26 ++++++-----
drivers/hwmon/pmbus/ltc2978.c | 50 +++++++++++++++++++---
3 files changed, 62 insertions(+), 17 deletions(-)
diff --git a/Documentation/devicetree/bindings/hwmon/ltc2978.txt b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
index ed2f09dc2483..230389f6c984 100644
--- a/Documentation/devicetree/bindings/hwmon/ltc2978.txt
+++ b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
@@ -6,6 +6,7 @@ Required properties:
* "lltc,ltc2977"
* "lltc,ltc2978"
* "lltc,ltc3880"
+ * "lltc,ltc3882"
* "lltc,ltc3883"
* "lltc,ltm4676"
- reg: I2C slave address
@@ -20,7 +21,7 @@ Valid names of regulators depend on number of supplies supported per device:
* ltc2974 : vout0 - vout3
* ltc2977 : vout0 - vout7
* ltc2978 : vout0 - vout7
- * ltc3880 : vout0 - vout1
+ * ltc3880, ltc3882 : vout0 - vout1
* ltc3883 : vout0
* ltm4676 : vout0 - vout1
diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index 686c078bb0e0..521ee8a1135c 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -19,6 +19,10 @@ Supported chips:
Prefix: 'ltc3880'
Addresses scanned: -
Datasheet: http://www.linear.com/product/ltc3880
+ * Linear Technology LTC3882
+ Prefix: 'ltc3882'
+ Addresses scanned: -
+ Datasheet: http://www.linear.com/product/ltc3882
* Linear Technology LTC3883
Prefix: 'ltc3883'
Addresses scanned: -
@@ -34,11 +38,12 @@ Author: Guenter Roeck <linux@xxxxxxxxxxxx>
Description
-----------
-LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply
-monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual
-output poly-phase step-down DC/DC controller. LTC3883 is a single phase
-step-down DC/DC controller. LTM4676 is a dual 13A or single 26A uModule
-regulator.
+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.
+LTC3883 is a single phase step-down DC/DC controller.
+LTM4676 is a dual 13A or single 26A uModule regulator.
Usage Notes
@@ -80,7 +85,7 @@ in[N]_label "vout[1-8]".
LTC2974: N=2-5
LTC2977: N=2-9
LTC2978: N=2-9
- LTC3880, LTM4676: N=2-3
+ LTC3880, LTC3882, LTM4676: N=2-3
LTC3883: N=2
in[N]_input Measured output voltage.
in[N]_min Minimum output voltage.
@@ -100,8 +105,9 @@ 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 and LTM4676, temp1 and temp2 report external
- temperatures, and temp3 reports the chip temperature.
+ On LTC3880, LTC3882, 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.
temp[N]_min Mimimum temperature. LTC2974, LCT2977, and LTC2978 only.
@@ -128,7 +134,7 @@ power[N]_label "pout[1-4]".
LTC2974: N=1-4
LTC2977: Not supported
LTC2978: Not supported
- LTC3880, LTM4676: N=1-2
+ LTC3880, LTC3882, LTM4676: N=1-2
LTC3883: N=2
power[N]_input Measured output power.
@@ -143,7 +149,7 @@ curr[N]_label "iout[1-4]".
LTC2974: N=1-4
LTC2977: not supported
LTC2978: not supported
- LTC3880, LTM4676: N=2-3
+ LTC3880, LTC3882, LTM4676: N=2-3
LTC3883: N=2
curr[N]_input Measured output current.
curr[N]_max Maximum output current.
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index a27debafaad9..b312f4390fe9 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -25,13 +25,13 @@
#include <linux/regulator/driver.h>
#include "pmbus.h"
-enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
+enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltm4676 };
/* Common for all chips */
#define LTC2978_MFR_VOUT_PEAK 0xdd
#define LTC2978_MFR_VIN_PEAK 0xde
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
-#define LTC2978_MFR_SPECIAL_ID 0xe7
+#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Not on LTC3882 */
/* LTC2974, LCT2977, and LTC2978 */
#define LTC2978_MFR_VOUT_MIN 0xfb
@@ -42,7 +42,7 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
#define LTC2974_MFR_IOUT_PEAK 0xd7
#define LTC2974_MFR_IOUT_MIN 0xd8
-/* LTC3880, LTC3883, and LTM4676 */
+/* LTC3880, LTC3882, LTC3883, and LTM4676 */
#define LTC3880_MFR_IOUT_PEAK 0xd7
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
@@ -313,7 +313,7 @@ static int ltc2978_clear_peaks(struct i2c_client *client, int page,
{
int ret;
- if (id == ltc3880 || id == ltc3883 || id == ltm4676)
+ if (id == ltc3880 || id == ltc3882 || id == ltc3883 || id == ltm4676)
ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
else
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
@@ -369,6 +369,7 @@ static const struct i2c_device_id ltc2978_id[] = {
{"ltc2977", ltc2977},
{"ltc2978", ltc2978},
{"ltc3880", ltc3880},
+ {"ltc3882", ltc3882},
{"ltc3883", ltc3883},
{"ltm4676", ltm4676},
{}
@@ -393,8 +394,30 @@ static int ltc2978_get_id(struct i2c_client *client)
int chip_id;
chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
- if (chip_id < 0)
- return chip_id;
+ if (chip_id < 0) {
+ const struct i2c_device_id *id;
+ u8 buf[I2C_SMBUS_BLOCK_MAX];
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+ if (ret < 0)
+ return ret;
+ if (ret < 3 || strncmp(buf, "LTC", 3))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+ if (ret < 0)
+ return ret;
+ for (id = <c2978_id[0]; strlen(id->name); id++) {
+ if (!strncasecmp(id->name, buf, strlen(id->name)))
+ return (int)id->driver_data;
+ }
+ return -ENODEV;
+ }
if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)
return ltc2974;
@@ -497,6 +520,20 @@ static int ltc2978_probe(struct i2c_client *client,
| PMBUS_HAVE_POUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
break;
+ case ltc3882:
+ info->read_word_data = ltc3880_read_word_data;
+ info->pages = LTC3880_NUM_PAGES;
+ info->func[0] = PMBUS_HAVE_VIN
+ | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
+ | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
+ info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+ break;
case ltc3883:
info->read_word_data = ltc3883_read_word_data;
info->pages = LTC3883_NUM_PAGES;
@@ -529,6 +566,7 @@ static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,ltc2977" },
{ .compatible = "lltc,ltc2978" },
{ .compatible = "lltc,ltc3880" },
+ { .compatible = "lltc,ltc3882" },
{ .compatible = "lltc,ltc3883" },
{ .compatible = "lltc,ltm4676" },
{ }
--
2.1.4
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