hwmon: (pmbus/ltc2978) add support for ltm4673

Add support for LTM4673. The LTM4673 is a quad output, dual 12A and dual
5A, switching mode DC/DC step-down μModule regulator integrated with
4-channel power system manager.

This adds only the chip id, the checks for the manufacturer special id,
and the relevant attributes for the device's pmbus_driver_info.
The device does not support clear peaks.

Signed-off-by: Cedric Encarnacion <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: cencarna

Documentation/hwmon/ltc2978.rst

@@ -167,6 +167,14 @@ Supported chips:
 
     Datasheet: https://www.analog.com/en/products/ltm4644
 
+   * Linear Technology LTM4673
+
+    Prefix: 'ltm4673'
+
+    Addresses scanned: -
+
+    Datasheet: https://www.analog.com/en/products/ltm4673
+
    * Linear Technology LTM4675
 
     Prefix: 'ltm4675'
@@ -245,6 +253,7 @@ Description
 - LTM2987 is a 16-channel Power System Manager with two LTC2977 plus
 - additional components on a single die. The chip is instantiated and reported
 - as two separate chips on two different I2C bus addresses.
+- LTM4673 is a dual 12A and dual 5A μModule regulator.
 - 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.

drivers/hwmon/pmbus/Kconfig

@@ -225,8 +225,8 @@ config SENSORS_LTC2978_REGULATOR
 	help
 	  If you say yes here you get regulator support for Linear Technology
 	  LT7170, LT7171, LTC3880, LTC3883, LTC3884, LTC3886, LTC3887, LTC3889,
-	  LTC7841, LTC7880, LTM4644, LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,
-	  LTM4686, and LTM4700.
+	  LTC7841, LTC7880, LTM4644, LTM4673, LTM4675, LTM4676, LTM4677, LTM4678,
+	  LTM4680, LTM4686, and LTM4700.
 
 config SENSORS_LTC3815
 	tristate "Linear Technologies LTC3815"

drivers/hwmon/pmbus/ltc2978.c

@@ -26,8 +26,8 @@ enum chips {
 	lt7170, lt7171, ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887,
 	ltc3889, ltc7132, ltc7841, ltc7880,
 	/* Modules */
-	ltm2987, ltm4664, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680, ltm4686,
-	ltm4700,
+	ltm2987, ltm4664, ltm4673, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680,
+	ltm4686, ltm4700,
 };
 
 /* Common for all chips */
@@ -87,6 +87,8 @@ enum chips {
 #define LTM2987_ID_A			0x8010	/* A/B for two die IDs */
 #define LTM2987_ID_B			0x8020
 #define LTM4664_ID			0x4120
+#define LTM4673_ID_REV1			0x0230
+#define LTM4673_ID			0x4480
 #define LTM4675_ID			0x47a0
 #define LTM4676_ID_REV1			0x4400
 #define LTM4676_ID_REV2			0x4480
@@ -557,6 +559,7 @@ static const struct i2c_device_id ltc2978_id[] = {
 	{"ltc7880", ltc7880},
 	{"ltm2987", ltm2987},
 	{"ltm4664", ltm4664},
+	{"ltm4673", ltm4673},
 	{"ltm4675", ltm4675},
 	{"ltm4676", ltm4676},
 	{"ltm4677", ltm4677},
@@ -687,6 +690,8 @@ static int ltc2978_get_id(struct i2c_client *client)
 		return ltm2987;
 	else if (chip_id == LTM4664_ID)
 		return ltm4664;
+	else if (chip_id == LTM4673_ID || chip_id == LTM4673_ID_REV1)
+		return ltm4673;
 	else if (chip_id == LTM4675_ID)
 		return ltm4675;
 	else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
@@ -905,6 +910,21 @@ static int ltc2978_probe(struct i2c_client *client)
 		  | PMBUS_HAVE_IOUT
 		  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 		break;
+	case ltm4673:
+		data->features |= FEAT_NEEDS_POLLING;
+		info->read_word_data = ltc2975_read_word_data;
+		info->pages = LTC2974_NUM_PAGES;
+		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+		  | PMBUS_HAVE_TEMP2;
+		for (i = 0; i < info->pages; i++) {
+			info->func[i] |= PMBUS_HAVE_IIN
+			  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+			  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+			  | PMBUS_HAVE_PIN
+			  | PMBUS_HAVE_POUT
+			  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
+		}
+		break;
 	default:
 		return -ENODEV;
 	}
@@ -964,6 +984,7 @@ static const struct of_device_id ltc2978_of_match[] = {
 	{ .compatible = "lltc,ltc7880" },
 	{ .compatible = "lltc,ltm2987" },
 	{ .compatible = "lltc,ltm4664" },
+	{ .compatible = "lltc,ltm4673" },
 	{ .compatible = "lltc,ltm4675" },
 	{ .compatible = "lltc,ltm4676" },
 	{ .compatible = "lltc,ltm4677" },