[PATCH v2 2/2] hwmon: (pmbus): Add driver for Infineon IR36021
From: Chris Packham
Date: Sun Feb 28 2021 - 23:01:38 EST
The IR36021 is a dual‐loop digital multi‐phase buck controller.
Signed-off-by: Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
---
Changes in v2:
- update against latest kernel for pmbus API changes
- avoid double negation
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/ir36021.rst | 62 ++++++++++++++++++++++++++
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/ir36021.c | 79 +++++++++++++++++++++++++++++++++
5 files changed, 152 insertions(+)
create mode 100644 Documentation/hwmon/ir36021.rst
create mode 100644 drivers/hwmon/pmbus/ir36021.c
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 8d5a2df1ecb6..b34894403c2b 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -77,6 +77,7 @@ Hardware Monitoring Kernel Drivers
intel-m10-bmc-hwmon
ir35221
ir38064
+ ir36021
isl68137
it87
jc42
diff --git a/Documentation/hwmon/ir36021.rst b/Documentation/hwmon/ir36021.rst
new file mode 100644
index 000000000000..36ef8d518b81
--- /dev/null
+++ b/Documentation/hwmon/ir36021.rst
@@ -0,0 +1,62 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver ir36021
+=====================
+
+Supported chips:
+
+ * Infineon IR36021
+
+ Prefix: ir36021
+ Addresses scanned: -
+
+ Datasheet: Publicly available at the Infineon website
+ https://www.infineon.com/dgdl/ir36021.pdf?fileId=5546d462533600a4015355d0aa2d1775
+
+Authors:
+ - Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>
+
+Description
+-----------
+
+The IR36021 is a dual‐loop digital multi‐phase buck controller designed for
+point of load applications.
+
+Usage Notes
+-----------
+
+This driver does not probe for PMBus devices. You will have to instantiate
+devices explicitly.
+
+Sysfs attributes
+----------------
+
+======================= ===========================
+curr1_label "iin"
+curr1_input Measured input current
+curr1_alarm Input fault alarm
+
+curr2_label "iout1"
+curr2_input Measured output current
+curr2_alarm Output over-current alarm
+
+in1_label "vin"
+in1_input Measured input voltage
+in1_alarm Input under-voltage alarm
+
+in2_label "vout1"
+in2_input Measured output voltage
+in2_alarm Output over-voltage alarm
+
+power1_label "pin"
+power1_input Measured input power
+power1_alarm Input under-voltage alarm
+
+power2_label "pout1"
+power2_input Measured output power
+
+temp1_input Measured temperature
+temp1_alarm Temperature alarm
+
+temp2_input Measured other loop temperature
+temp2_alarm Temperature alarm
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 32d2fc850621..ee8c27b3b83d 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -84,6 +84,15 @@ config SENSORS_IR35221
This driver can also be built as a module. If so, the module will
be called ir35221.
+config SENSORS_IR36021
+ tristate "Infineon IR36021"
+ help
+ If you say yes here you get hardware monitoring support for Infineon
+ IR36021.
+
+ This driver can also be built as a module. If so, the module will
+ be called ir36021.
+
config SENSORS_IR38064
tristate "Infineon IR38064"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 6a4ba0fdc1db..685a6bc2b15f 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
+obj-$(CONFIG_SENSORS_IR36021) += ir36021.o
obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
obj-$(CONFIG_SENSORS_IRPS5401) += irps5401.o
obj-$(CONFIG_SENSORS_ISL68137) += isl68137.o
diff --git a/drivers/hwmon/pmbus/ir36021.c b/drivers/hwmon/pmbus/ir36021.c
new file mode 100644
index 000000000000..4767e39cc965
--- /dev/null
+++ b/drivers/hwmon/pmbus/ir36021.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Infineon IR36021
+ *
+ * Copyright (c) 2021 Allied Telesis
+ */
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info ir36021_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = linear,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_POWER] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
+ | PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
+ | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
+ | PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int ir36021_probe(struct i2c_client *client)
+{
+ u8 buf[I2C_SMBUS_BLOCK_MAX];
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA
+ | I2C_FUNC_SMBUS_READ_WORD_DATA
+ | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+ return -ENODEV;
+
+ ret = i2c_smbus_read_i2c_block_data(client, PMBUS_MFR_MODEL, 2, buf);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
+ return ret;
+ }
+ if (ret != 2 || buf[0] != 0x01 || buf[1] != 0x2d) {
+ dev_err(&client->dev, "MFR_MODEL unrecognised\n");
+ return -ENODEV;
+ }
+
+ return pmbus_do_probe(client, &ir36021_info);
+}
+
+static const struct i2c_device_id ir36021_id[] = {
+ { "ir36021", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ir36021_id);
+
+static const struct of_device_id __maybe_unused ir36021_of_id[] = {
+ { .compatible = "infineon,ir36021" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ir36021_of_id);
+
+static struct i2c_driver ir36021_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "ir36021",
+ .of_match_table = of_match_ptr(ir36021_of_id),
+ },
+ .probe_new = ir36021_probe,
+ .id_table = ir36021_id,
+};
+
+module_i2c_driver(ir36021_driver);
+
+MODULE_AUTHOR("Chris Packham <chris.packham@xxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PMBus driver for Infineon IR36021");
+MODULE_LICENSE("GPL");
--
2.30.0