From: "Ainux.Wang" <ainux.wang@xxxxxxxxx>
Add support for MP2949A device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a triple-loop, digital, multi-phase controller.
This device:
- Supports up to three power rail.
- Provides 6 pulse-width modulations (PWMs), and can be configured up
to 6-phase operation for Rail A , up to 2-phase operation for Rail B
and up to 1-phase operation for Rail C.
- The PMBus registers are distributed into three pages: Page 0, Page 1,
Page 2. Page 0 contains the registers for Rail A and most of the common
settings for all of the rails. Page 1 contains register information for
Rail B. Page 2 contains register information for Rail C.
- The MP2949A supports both 5mV VID step and 10mv VID step for IMVP8 and
IMVP9 with only one DAC for each rail to generate REF.
Signed-off-by: Ainux.Wang <ainux.wang@xxxxxxxxx>
---
Documentation/hwmon/mp2949a.rst | 48 ++++++++++++++++++
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/mp2949a.c | 83 ++++++++++++++++++++++++++++++++
drivers/hwmon/pmbus/pmbus.h | 6 +++
drivers/hwmon/pmbus/pmbus_core.c | 18 +++++--
6 files changed, 160 insertions(+), 5 deletions(-)
create mode 100644 Documentation/hwmon/mp2949a.rst
create mode 100644 drivers/hwmon/pmbus/mp2949a.c
diff --git a/Documentation/hwmon/mp2949a.rst b/Documentation/hwmon/mp2949a.rst
new file mode 100644
index 000000000000..82ab15e0588b
--- /dev/null
+++ b/Documentation/hwmon/mp2949a.rst
@@ -0,0 +1,48 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mp2949a
+====================
+
+Supported chips:
+
+ * MPS MP2949A
+
+ Prefix: 'mp2949a'
+
+Author:
+
+ Ainux Wang <ainux.wang@xxxxxxxxx>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+vendor triple-loop, digital, multi-phase controller MP2949A.
+
+This device:
+
+- Supports up to three power rail.
+- Provides 6 pulse-width modulations (PWMs), and can be configured up
+ to 6-phase operation for Rail A , up to 2-phase operation for Rail B
+ and up to 1-phase operation for Rail C.
+- The PMBus registers are distributed into three pages: Page 0, Page 1,
+ Page 2. Page 0 contains the registers for Rail A and most of the common
+ settings for all of the rails. Page 1 contains register information for
+ Rail B. Page 2 contains register information for Rail C.
+- The MP2949A supports both 5mV VID step and 10mv VID step for IMVP8 and
+ IMVP9 with only one DAC for each rail to generate REF.
+
+Device supports:
+
+- SVID interface.
+- PMBus interface.
+
+Device complaint with:
+
+- PMBus rev 1.2 interface.
+
+Device supports direct format for reading output power.
+Device supports linear format for reading input voltage and output current
+and temperature.
+Device supports VID for reading output voltage.
+The below VID modes are supported: VR12, VR13, IMVP8, IMVP9.
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 37a5c39784fa..b1344b265976 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -248,6 +248,15 @@ config SENSORS_MAX8688
This driver can also be built as a module. If so, the module will
be called max8688.
+config SENSORS_MP2949A
+ tristate "MPS MP2949A"
+ help
+ If you say yes here you get hardware monitoring support for MPS
+ MP2949A Triple Loop Digital Multi-Phase Controller.
+
+ This driver can also be built as a module. If so, the module will
+ be called mp2949a.
+
config SENSORS_MP2975
tristate "MPS MP2975"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index f8dcc27cd56a..bfb55ab12da1 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -28,6 +28,7 @@ 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-$(CONFIG_SENSORS_MP2949A) += mp2949a.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o
diff --git a/drivers/hwmon/pmbus/mp2949a.c b/drivers/hwmon/pmbus/mp2949a.c
new file mode 100644
index 000000000000..2b51176d8921
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp2949a.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for Monolithic Power Systems MP2949A
+ *
+ * Copyright (c) 2021 Lemote Technologies. All rights reserved.
+ * Copyright (c) 2021 Ainux <ainux.wang@xxxxxxxxx>
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+#define MP2949A_PAGE_NUM 3
+
+static struct pmbus_driver_info mp2949a_info = {
+ .pages = MP2949A_PAGE_NUM,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = vid,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_POWER] = direct,
+ .m[PSC_POWER] = 1,
+ .b[PSC_POWER] = 0,
+ .R[PSC_POWER] = 0,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_POUT,
+ .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_POUT,
+ .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_POUT,
+ .skip_icp = true,
+};
+
+static int mp2949a_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pmbus_driver_info *info;
+ int i;
+
+ info = devm_kmemdup(&client->dev, &mp2949a_info, sizeof(*info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ for (i = 0; i < MP2949A_PAGE_NUM; i++)
+ info->vrm_version[i] = vr12;
+
+ return pmbus_do_probe(client, info);
+}
+
+static const struct i2c_device_id mp2949a_id[] = {
+ {"mp2949a", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, mp2949a_id);
+
+static const struct of_device_id mp2949a_of_match[] = {
+ {.compatible = "mps,mp2949a"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, mp2949a_of_match);
+
+static struct i2c_driver mp2949a_driver = {
+ .driver = {
+ .name = "mp2949a",
+ .of_match_table = of_match_ptr(mp2949a_of_match),
+ },
+ .probe = mp2949a_probe,
+ .id_table = mp2949a_id,
+};
+
+module_i2c_driver(mp2949a_driver);
+
+MODULE_AUTHOR("Ainux <ainux.wang@xxxxxxxxx>");
+MODULE_DESCRIPTION("PMBus driver for Monolithic Power Systems MP2949A");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index 3968924f8533..fd329670876d 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -454,6 +454,12 @@ struct pmbus_driver_info {
/* custom attributes */
const struct attribute_group **groups;
+
+ /*
+ * Skip identify chip parameters,
+ * some device do not support the PMBUS_VOUT_MODE.
+ */
+ bool skip_icp;
};
/* Regulator ops */
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index bbd745178147..644bef5cdafd 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -2248,13 +2248,21 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
return -ENODEV;
}
- for (page = 0; page < info->pages; page++) {
- ret = pmbus_identify_common(client, data, page);
- if (ret < 0) {
- dev_err(dev, "Failed to identify chip capabilities\n");
- return ret;
+ /*
+ * Some device do not support the PMBUS_VOUT_MODE,
+ * and the driver of device has known correct formats,
+ * so the driver set skip_icp to true.
+ */
+ if (!data->info->skip_icp) {
+ for (page = 0; page < info->pages; page++) {
+ ret = pmbus_identify_common(client, data, page);
+ if (ret < 0) {
+ dev_err(dev, "Failed to identify chip capabilities\n");
+ return ret;
+ }
}
}
+
return 0;
}
--
2.18.1
