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

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 <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>

Documentation/devicetree/bindings/hwmon/ltc2978.txt

···
   * "lltc,ltm2987"
   * "lltc,ltm4675"
   * "lltc,ltm4676"
+  * "lltc,ltm4686"
 - reg: I2C slave address
 
 Optional properties:
···
   * ltc3880, ltc3882, ltc3886 : vout0 - vout1
   * ltc3883 : vout0
   * ltm4676 : vout0 - vout1
+  * ltm4686 : vout0 - vout1
 
 Example:
 ltc2978@5e {

Documentation/hwmon/ltc2978

···
     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 <[e-mail]>
 
···
 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

drivers/hwmon/pmbus/Kconfig

···
 	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"

drivers/hwmon/pmbus/ltc2978.c

···
  * 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
···
 #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
···
 #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
···
 	{"ltm2987", ltm2987},
 	{"ltm4675", ltm4675},
 	{"ltm4676", ltm4676},
+	{"ltm4686", ltm4686},
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ltc2978_id);
···
 	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;
···
 	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;
···
 	{ .compatible = "lltc,ltm2987" },
 	{ .compatible = "lltc,ltm4675" },
 	{ .compatible = "lltc,ltm4676" },
+	{ .compatible = "lltc,ltm4686" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ltc2978_of_match);