Add support for mp2888 device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a digital, multi-phase, pulse-width modulation
controller.
This device supports:
- One power rail.
- Programmable Multi-Phase up to 10 Phases.
- PWM-VID Interface
- One pages 0 for telemetry.
- Programmable pins for PMBus Address.
- Built-In EEPROM to Store Custom Configurations.
- Can configured VOUT readout in direct or VID format and allows
setting of different formats on rails 1 and 2. For VID the following
protocols are available: VR13 mode with 5-mV DAC; VR13 mode with
10-mV DAC, IMVP9 mode with 5-mV DAC.
Signed-off-by: Vadim Pasternak <vadimp@xxxxxxxxxx>
---
Documentation/hwmon/mp2888.rst | 111 ++++++++++++++++++
drivers/hwmon/pmbus/Kconfig | 9 ++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/mp2888.c | 256 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 377 insertions(+)
create mode 100644 Documentation/hwmon/mp2888.rst
create mode 100644 drivers/hwmon/pmbus/mp2888.c
diff --git a/Documentation/hwmon/mp2888.rst b/Documentation/hwmon/mp2888.rst
new file mode 100644
index 000000000000..7839a010642a
--- /dev/null
+++ b/Documentation/hwmon/mp2888.rst
@@ -0,0 +1,111 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mp2888
+====================
+
+Supported chips:
+
+ * MPS MP12254
+
+ Prefix: 'mp2888'
+
+Author:
+
+ Vadim Pasternak <vadimp@xxxxxxxxxx>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+vendor dual-loop, digital, multi-phase controller MP2888.
+
+This device: supports:
+
+- One power rail.
+- Programmable Multi-Phase up to 10 Phases.
+- PWM-VID Interface
+- One pages 0 for telemetry.
+- Programmable pins for PMBus Address.
+- Built-In EEPROM to Store Custom Configurations.
+
+Device complaint with:
+
+- PMBus rev 1.3 interface.
+
+Device supports direct format for reading output current, output voltage,
+input and output power and temperature.
+Device supports linear format for reading input voltage and input power.
+
+The driver provides the next attributes for the current:
+
+- for current out input and maximum alarm;
+- for phase current: input and label.
+
+The driver exports the following attributes via the 'sysfs' files, where:
+
+- 'n' is number of configured phases (from 1 to 10);
+- index 1 for "iout";
+- indexes 2 ... 1 + n for phases.
+
+**curr1_alarm**
+
+**curr[1-{1+n}]_input**
+
+**curr[1-{1+n}]_label**
+
+The driver provides the next attributes for the voltage:
+
+- for voltage in: input, low and high critical thresholds, low and high
+ critical alarms;
+- for voltage out: input and high alarm;
+
+The driver exports the following attributes via the 'sysfs' files, where
+
+**in1_crit**
+
+**in1_crit_alarm**
+
+**in1_input**
+
+**in1_label**
+
+**in1_min**
+
+**in1_min_alarm**
+
+**in2_alarm**
+
+**in2_input**
+
+**in2_label**
+
+The driver provides the next attributes for the power:
+
+- for power in alarm and input.
+- for power out: cap, cap alarm an input.
+
+The driver exports the following attributes via the 'sysfs' files, where
+- indexes 1 for "pin";
+- indexes 2 for "pout";
+
+**power1_alarm**
+
+**power1_input**
+
+**power1_label**
+
+**power2_cap**
+
+**power2_cap_alarm**
+
+**power2_input**
+
+**power2_label**
+
+The driver provides the next attributes for the temperature:
+
+**temp1_input**
+
+**temp1_max**
+
+**temp1_max_alarm**
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 32d2fc850621..a57571928b31 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -211,6 +211,15 @@ config SENSORS_MAX8688
This driver can also be built as a module. If so, the module will
be called max8688.
+config SENSORS_MP2888
+ tristate "MPS MP2888"
+ help
+ If you say yes here you get hardware monitoring support for MPS
+ MP2888 Digital, Multi-Phase, Pulse-Width Modulation Controller.
+
+ This driver can also be built as a module. If so, the module will
+ be called mp2888.
+
config SENSORS_MP2975
tristate "MPS MP2975"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 6a4ba0fdc1db..a6d7352621ca 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
+obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o
diff --git a/drivers/hwmon/pmbus/mp2888.c b/drivers/hwmon/pmbus/mp2888.c
new file mode 100644
index 000000000000..3d4b272616c6
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp2888.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers
+ *
+ * Copyright (C) 2020 Nvidia Technologies Ltd.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+/* Vendor specific registers. */
+#define MP2888_MFR_SYS_CONFIG 0x44
+#define MP2888_MFR_VR_CONFIG1 0xe1
+
+#define MP2888_TOTAL_CURRENT_RESOLUTION BIT(3)
+#define MP2888_VIN_LIMIT_UNIT 8
+#define MP2888_VIN_UNIT 3125
+#define MP2888_TEMP_UNIT 10
+#define MP2888_MAX_PHASE 10
+
+struct mp2888_data {
+ struct pmbus_driver_info info;
+ int total_curr_resolution;
+};
+
+#define to_mp2888_data(x) container_of(x, struct mp2888_data, info)
+
+static int mp2888_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ switch (reg) {
+ case PMBUS_VOUT_MODE:
+ /* Enforce VOUT direct format. */
+ return PB_VOUT_MODE_DIRECT;
+ default:
+ return -ENODATA;
+ }
+}
+
+static int
+mp2888_read_word_helper(struct i2c_client *client, int page, int phase, u8 reg, u16 mask)
+{
+ int ret = pmbus_read_word_data(client, page, phase, reg);
+
+ return (ret > 0) ? ret & mask : ret;
+}
+
+static int mp2888_read_word_data(struct i2c_client *client, int page, int phase, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct mp2888_data *data = to_mp2888_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_OT_WARN_LIMIT:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(7, 0));
+ break;
+ case PMBUS_VIN_OV_FAULT_LIMIT:
+ case PMBUS_VIN_UV_WARN_LIMIT:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(7, 0));
+ ret = (ret < 0) ? ret : DIV_ROUND_CLOSEST(ret, MP2888_VIN_LIMIT_UNIT);
+ break;
+ case PMBUS_READ_VIN:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(9, 0));
+ ret = (ret < 0) ? ret : DIV_ROUND_CLOSEST(ret * MP2888_VIN_UNIT, 100000);
+ break;
+ case PMBUS_READ_VOUT:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(11, 0));
+ break;
+ case PMBUS_READ_TEMPERATURE_1:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(11, 0));
+ ret = (ret < 0) ? ret : DIV_ROUND_CLOSEST(ret, MP2888_TEMP_UNIT);
+ break;
+ case PMBUS_READ_IOUT:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(11, 0));
+ ret = (ret < 0) ? ret : data->total_curr_resolution ? DIV_ROUND_CLOSEST(ret, 2) :
+ DIV_ROUND_CLOSEST(ret, 4);
+ /*
+ * Current phase sensing, providing by the device through the dedicated
+ * registers 73h - 77h is not accurate, because sampling of current occurrence of
+ * bit weight has a big deviation. Calculate per-phase current as total current
+ * divided by number phases.
+ */
+ if (phase != 0xff)
+ ret = (ret < 0) ? ret : DIV_ROUND_CLOSEST(ret, data->info.phases[page]);
+ break;
+ case PMBUS_READ_POUT:
+ case PMBUS_READ_PIN:
+ ret = mp2888_read_word_helper(client, page, phase, reg, GENMASK(11, 0));
+ ret = (ret < 0) ? ret : data->total_curr_resolution ? ret :
+ DIV_ROUND_CLOSEST(ret, 2);
+ break;
+ case PMBUS_OT_FAULT_LIMIT:
+ case PMBUS_UT_WARN_LIMIT:
+ case PMBUS_UT_FAULT_LIMIT:
+ case PMBUS_VIN_UV_FAULT_LIMIT:
+ case PMBUS_VOUT_UV_WARN_LIMIT:
+ case PMBUS_VOUT_OV_WARN_LIMIT:
+ case PMBUS_VOUT_UV_FAULT_LIMIT:
+ case PMBUS_VOUT_OV_FAULT_LIMIT:
+ case PMBUS_VIN_OV_WARN_LIMIT:
+ case PMBUS_IOUT_OC_LV_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ case PMBUS_IOUT_UC_FAULT_LIMIT:
+ case PMBUS_POUT_OP_FAULT_LIMIT:
+ case PMBUS_POUT_OP_WARN_LIMIT:
+ case PMBUS_PIN_OP_WARN_LIMIT:
+ case PMBUS_MFR_VIN_MIN:
+ case PMBUS_MFR_VIN_MAX:
+ case PMBUS_MFR_VOUT_MAX:
+ case PMBUS_MFR_IIN_MAX:
+ case PMBUS_MFR_IOUT_MAX:
+ case PMBUS_MFR_PIN_MAX:
+ case PMBUS_MFR_POUT_MAX:
+ case PMBUS_MFR_MAX_TEMP_1:
+ return -ENXIO;
+ default:
+ return -ENODATA;
+ }
+
+ return ret;
+}
+
+static void mp2888_set_phase(struct pmbus_driver_info *info)
+{
+ int i;
+
+ for (i = 0 ; i < info->phases[0]; i++)
+ info->pfunc[i] = PMBUS_HAVE_IOUT;
+}
+
+static int
+mp2888_identify_multiphase(struct i2c_client *client, struct mp2888_data *data,
+ struct pmbus_driver_info *info)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Identify multiphase number - could be from 1 to 10. */
+ ret = i2c_smbus_read_word_data(client, MP2888_MFR_VR_CONFIG1);
+ if (ret <= 0)
+ return ret;
+
+ info->phases[0] = ret & GENMASK(3, 0);
+
+ /*
+ * The device provides a total of 10 PWM pins, and can be configured to different phase
+ * count applications for rail.
+ */
+ if (info->phases[0] > MP2888_MAX_PHASE)
+ return -EINVAL;
+
+ mp2888_set_phase(info);
+
+ return 0;
+}
+
+static int mp2888_current_resolution_get(struct i2c_client *client, struct mp2888_data *data)
+{
+ int ret;
+
+ /*
+ * Obtain resolution selector for total current report and protection.
+ * 0: original resolution; 1: half resolution (in such case phase current value should
+ * be doubled.
+ */
+ ret = i2c_smbus_read_word_data(client, MP2888_MFR_SYS_CONFIG);
+ if (ret < 0)
+ return ret;
+ data->total_curr_resolution = (ret & MP2888_TOTAL_CURRENT_RESOLUTION) >> 3;
+
+ return 0;
+}
+
+static struct pmbus_driver_info mp2888_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_POWER] = direct,
+ .m[PSC_TEMPERATURE] = 1,
+ .m[PSC_VOLTAGE_OUT] = 1,
+ .R[PSC_VOLTAGE_OUT] = 3,
+ .m[PSC_CURRENT_OUT] = 1,
+ .m[PSC_POWER] = 1,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT |
+ PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_PHASE_VIRTUAL,
+ .read_byte_data = mp2888_read_byte_data,
+ .read_word_data = mp2888_read_word_data,
+};
+
+static int mp2888_probe(struct i2c_client *client)
+{
+ struct pmbus_driver_info *info;
+ struct mp2888_data *data;
+ int ret;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct mp2888_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ memcpy(&data->info, &mp2888_info, sizeof(*info));
+ info = &data->info;
+
+ /* Identify multiphase configuration. */
+ ret = mp2888_identify_multiphase(client, data, info);
+ if (ret)
+ return ret;
+
+ /* Obtain total current resolution. */
+ ret = mp2888_current_resolution_get(client, data);
+ if (ret)
+ return ret;
+
+ return pmbus_do_probe(client, info);
+}
+
+static const struct i2c_device_id mp2888_id[] = {
+ {"mp2888", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, mp2888_id);
+
+static const struct of_device_id __maybe_unused mp2888_of_match[] = {
+ {.compatible = "mps,mp2888"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, mp2888_of_match);
+
+static struct i2c_driver mp2888_driver = {
+ .driver = {
+ .name = "mp2888",
+ .of_match_table = of_match_ptr(mp2888_of_match),
+ },
+ .probe_new = mp2888_probe,
+ .id_table = mp2888_id,
+};
+
+module_i2c_driver(mp2888_driver);
+
+MODULE_AUTHOR("Vadim Pasternak <vadimp@xxxxxxxxxx>");
+MODULE_DESCRIPTION("PMBus driver for MPS MP2888 device");
+MODULE_LICENSE("GPL");
--
2.11.0
