hwmon: (ltc2978) Add support for LTC3887

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

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

4 files changed, 29 insertions, 13 deletions

diff --git a/Documentation/devicetree/bindings/hwmon/ltc2978.txt b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
index 230389f6c984..c1d23c14ddd9 100644
--- a/Documentation/devicetree/bindings/hwmon/ltc2978.txt
+++ b/Documentation/devicetree/bindings/hwmon/ltc2978.txt
@@ -8,6 +8,7 @@ Required properties:
   * "lltc,ltc3880"
   * "lltc,ltc3882"
   * "lltc,ltc3883"
+  * "lltc,ltc3887"
   * "lltc,ltm4676"
 - reg: I2C slave address
 
diff --git a/Documentation/hwmon/ltc2978 b/Documentation/hwmon/ltc2978
index 521ee8a1135c..ff130997f22e 100644
--- a/Documentation/hwmon/ltc2978
+++ b/Documentation/hwmon/ltc2978
@@ -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.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 2b3242cc7779..43b6de900ce5 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -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.
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index acbfe3ec2ffd..0756d8ae9dad 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -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" },
         { }
 };