[dps200] Add dps200 PSU module driver (#207)

Fix sonic-net#6602

This change is add new dps200 PSU module driver for fix this issue sonic-net#6602

I have try to use the generic pmbus driver, but it not support.

[ 5733.051510] pmbus 12-005a: Chip identification failed
[ 5733.112598] i2c i2c-12: new_device: Instantiated device pmbus at 0x5a
[ 5748.459851] pmbus 13-005b: Chip identification failed
[ 5748.520975] i2c i2c-13: new_device: Instantiated device pmbus at 0x5b

patch/driver-hwmon-pmbus-dps200.patch

@@ -0,0 +1,158 @@
+From 966db1e756443757cf74b7d0ba56a3254e35fd79 Mon Sep 17 00:00:00 2001
+
+From: Saranpong Chobtrong <schobtr@celestica.com>
+
+Subject: [PATCH] hwmon: (pmbus/dps200): Support DPS200 PSU module
+
+The generic PMBUS driver does not support the chip that uses direct mode yet.
+This driver supports dps200 which uses coefficients defined in the datasheet.
+Ref: datasheet is DPS200PB184E-ES002.pdf [not public access datasheet]
+
+DP200 does not support pmbus coefficient commands.
+Each field of direct mode has a conversion definition defined by the datasheet.
+
+Add dps200 device to the dps1900 driver.
+
+Signed-off-by: Saranpong Chobtrong <schobtr@celestica.com>
+---
+ drivers/hwmon/pmbus/dps1900.c |  104 +++++++++++++++++++++++++++++++++++++++--
+ 1 file changed, 98 insertions(+), 6 deletions(-)
+
+diff --git a/drivers/hwmon/pmbus/dps1900.c b/drivers/hwmon/pmbus/dps1900.c
+index f737f6480..d60c48e2c 100644
+--- a/drivers/hwmon/pmbus/dps1900.c
++++ b/drivers/hwmon/pmbus/dps1900.c
+@@ -1,3 +1,5 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++
+ #include <linux/kernel.h>
+ #include <linux/module.h>
+ #include <linux/init.h>
+@@ -7,6 +9,8 @@
+ #include <linux/pmbus.h>
+ #include "pmbus.h"
+
++enum chips { dps1900, dps200 };
++
+ static int dps1900_read_word_data(struct i2c_client *client, int page, int reg)
+ {
+ 	if (reg >= PMBUS_VIRT_BASE ||
+@@ -30,24 +34,112 @@ static int dps1900_read_word_data(struct i2c_client *client, int page, int reg)
+ 	return pmbus_read_word_data(client, page, reg);
+ }
+
++static int dps200_read_word_data(struct i2c_client *client, int page, int reg)
++{
++
++	if (reg >= PMBUS_VIRT_BASE ||
++	    reg == PMBUS_VOUT_OV_FAULT_LIMIT ||
++	    reg == PMBUS_VOUT_OV_WARN_LIMIT ||
++	    reg == PMBUS_VOUT_UV_WARN_LIMIT ||
++	    reg == PMBUS_VOUT_UV_FAULT_LIMIT ||
++	    reg == PMBUS_IOUT_OC_LV_FAULT_LIMIT ||
++	    reg == PMBUS_IOUT_UC_FAULT_LIMIT ||
++	    reg == PMBUS_UT_WARN_LIMIT ||
++	    reg == PMBUS_UT_FAULT_LIMIT ||
++	    reg == PMBUS_VIN_OV_FAULT_LIMIT ||
++	    reg == PMBUS_VIN_OV_WARN_LIMIT ||
++	    reg == PMBUS_IIN_OC_FAULT_LIMIT ||
++	    reg == PMBUS_POUT_MAX)
++		return -ENXIO;
++
++	/*
++	 * NOTE: The following field have constant driver value.
++	 * If the register are PMBUS_IOUT_OC_WARN_LIMIT or
++	 * PMBUS_IOUT_OC_FAULT_LIMIT convert the constant value from linear
++	 * to direct format.
++	 */
++	if (reg == PMBUS_IOUT_OC_WARN_LIMIT)
++		return 0xb4;
++	else if (reg == PMBUS_IOUT_OC_FAULT_LIMIT)
++		return 0xc8;
++	else
++		return pmbus_read_word_data(client, page, reg);
++}
++
+ static struct pmbus_driver_info dps1900_info = {
+ 	.pages = 1,
+ 	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+-	         | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+-	         | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
+-	         | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP
+-	         | PMBUS_HAVE_STATUS_INPUT,
++		 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
++		 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
++		 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP
++		 | PMBUS_HAVE_STATUS_INPUT,
+ 	.read_word_data = dps1900_read_word_data,
+ };
+
++/*
++ * From DPS-200 datasheet the supported sensors format defined as:
++ * VOUT: direct mode with one decimal place.
++ *
++ * Other sensors:
++ * IOUT: direct mode with one decimal place.
++ * IOUT Limits: linear mode, which difference from IOUT.
++ * VIN, IIN, POWER, TEMP, & FAN: linear mode.
++ */
++static struct pmbus_driver_info dps200_info = {
++	.pages = 1,
++	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
++		 | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
++		 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
++		 | PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
++		 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3
++		 | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT,
++	.format = {
++		[PSC_VOLTAGE_OUT] = direct,
++		[PSC_CURRENT_OUT] = direct,
++	},
++	.m = {
++		[PSC_VOLTAGE_OUT] = 10,
++		[PSC_CURRENT_OUT] = 10,
++	},
++	.b = {
++		[PSC_VOLTAGE_OUT] = 0,
++		[PSC_CURRENT_OUT] = 0,
++	},
++	.R = {
++		[PSC_VOLTAGE_OUT] = 0,
++		[PSC_CURRENT_OUT] = 0,
++	},
++	.read_word_data = dps200_read_word_data,
++};
++
+ static int dps1900_probe(struct i2c_client *client,
+ 			 const struct i2c_device_id *id)
+ {
+-	return pmbus_do_probe(client, id, &dps1900_info);
++	struct pmbus_driver_info *info;
++
++	info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
++			    GFP_KERNEL);
++	if (!info)
++		return -ENOMEM;
++
++	switch (id->driver_data) {
++	case dps1900:
++		info = &dps1900_info;
++		break;
++	case dps200:
++		info = &dps200_info;
++		break;
++	default:
++		dev_err(&client->dev, "Unsupported device\n");
++		return -ENODEV;
++	}
++
++	return pmbus_do_probe(client, id, info);
+ }
+
+ static const struct i2c_device_id dps1900_id[] = {
+-	{"dps1900", 0},
++	{"dps1900", dps1900},
++	{"dps200", dps200},
+ 	{}
+ };
+

patch/series

@@ -24,6 +24,7 @@ driver-hwmon-pmbus-dni_dps460.patch
 driver-hwmon-pmbus-dni_dps460-update-pmbus-core.patch
 driver-hwmon-pmbus-dni_dps460-add-status-attributes.patch
 driver-hwmon-pmbus-dps1900.patch
+driver-hwmon-pmbus-dps200.patch
 driver-support-tun-config-carrier-enable.patch
 driver-support-optoe.patch
 driver-support-optoe-EOF_fix.patch