[v2,2/2] hwmon: (pmbus) Add support for MPS Multi-phase mp5990
Commit Message
Add support for mp5990 device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a Hot-Swap Controller.
Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
---
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/mp5990.rst | 84 +++++++++++++++++++++++++++++++++
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/mp5990.c | 86 ++++++++++++++++++++++++++++++++++
5 files changed, 181 insertions(+)
create mode 100644 Documentation/hwmon/mp5990.rst
create mode 100644 drivers/hwmon/pmbus/mp5990.c
Comments
On 11/8/23 20:48, Peter Yin wrote:
> Add support for mp5990 device from Monolithic Power Systems, Inc. (MPS)
> vendor. This is a Hot-Swap Controller.
>
> Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
> ---
> Documentation/hwmon/index.rst | 1 +
> Documentation/hwmon/mp5990.rst | 84 +++++++++++++++++++++++++++++++++
> drivers/hwmon/pmbus/Kconfig | 9 ++++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/mp5990.c | 86 ++++++++++++++++++++++++++++++++++
> 5 files changed, 181 insertions(+)
> create mode 100644 Documentation/hwmon/mp5990.rst
> create mode 100644 drivers/hwmon/pmbus/mp5990.c
>
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index 042e1cf9501b..8c70e10fc795 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -157,6 +157,7 @@ Hardware Monitoring Kernel Drivers
> mp2888
> mp2975
> mp5023
> + mp5990
> nct6683
> nct6775
> nct7802
> diff --git a/Documentation/hwmon/mp5990.rst b/Documentation/hwmon/mp5990.rst
> new file mode 100644
> index 000000000000..d2da0f767530
> --- /dev/null
> +++ b/Documentation/hwmon/mp5990.rst
> @@ -0,0 +1,84 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +Kernel driver mp5990
> +====================
> +
> +Supported chips:
> +
> + * MPS MP5990
> +
> + Prefix: 'mp5990'
> +
> + * Datasheet
> +
> + Publicly available at the MPS website : https://www.monolithicpower.com/en/mp5990.html
> +
> +Author:
> +
> + Peter Yin <peteryin.openbmc@gmail.com>
> +
> +Description
> +-----------
> +
> +This driver implements support for Monolithic Power Systems, Inc. (MPS)
> +MP5990 Hot-Swap Controller.
> +
> +Device compliant with:
> +
> +- PMBus rev 1.3 interface.
> +
> +Device supports direct format for reading input voltage, output voltage,
> +output current, input power and temperature.
> +
The device also supports linear mode according to its datasheet.
> +The driver exports the following attributes via the 'sysfs' files
> +for input voltage:
> +
> +**in1_input**
> +
> +**in1_label**
> +
> +**in1_max**
> +
> +**in1_max_alarm**
> +
> +**in1_min**
> +
> +**in1_min_alarm**
> +
> +The driver provides the following attributes for output voltage:
> +
> +**in2_input**
> +
> +**in2_label**
> +
> +**in2_alarm**
> +
> +The driver provides the following attributes for output current:
> +
> +**curr1_input**
> +
> +**curr1_label**
> +
> +**curr1_alarm**
> +
> +**curr1_max**
> +
> +The driver provides the following attributes for input power:
> +
> +**power1_input**
> +
> +**power1_label**
> +
> +**power1_alarm**
> +
> +The driver provides the following attributes for temperature:
> +
> +**temp1_input**
> +
> +**temp1_max**
> +
> +**temp1_max_alarm**
> +
> +**temp1_crit**
> +
> +**temp1_crit_alarm**
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 270b6336b76d..65a116f7744d 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -326,6 +326,15 @@ config SENSORS_MP5023
> This driver can also be built as a module. If so, the module will
> be called mp5023.
>
> +config SENSORS_MP5990
> + tristate "MPS MP5990"
> + help
> + If you say yes here you get hardware monitoring support for MPS
> + MP5990.
> +
> + This driver can also be built as a module. If so, the module will
> + be called mp5990.
> +
> config SENSORS_MPQ7932_REGULATOR
> bool "Regulator support for MPQ7932"
> depends on SENSORS_MPQ7932 && REGULATOR
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 84ee960a6c2d..212d9ca0acc9 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
> obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
> obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
> obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
> +obj-$(CONFIG_SENSORS_MP5990) += mp5990.o
> obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o
> obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o
> obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
> diff --git a/drivers/hwmon/pmbus/mp5990.c b/drivers/hwmon/pmbus/mp5990.c
> new file mode 100644
> index 000000000000..fb3ac9c5d44e
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/mp5990.c
> @@ -0,0 +1,86 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Driver for MPS MP5990 Hot-Swap Controller
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/pmbus.h>
Not used in this driver.
> +#include "pmbus.h"
> +
> +static int mp5990_read_byte_data(struct i2c_client *client, int page, int reg)
> +{
> + switch (reg) {
> + case PMBUS_VOUT_MODE:
> + /* The datasheet does not support the VOUT command,
Standard multi-line comments, please. This is not the networking subsystem.
> + * but the device responds with a default value of 0x17.
> + * In the standard, 0x17 represents linear mode. However,
> + * for the MP5990, the VOUT linear mode is linear11, not linear16.
> + * Therefore, we should enforce the VOUT in the direct format.
> + */
> + return PB_VOUT_MODE_DIRECT;
This doesn't take into account that the reporting mode is set in
EFUSE_CFG bit 9 (RPT_FORMAT). If the chip is configured to report its data
in linear mode, all readings will be wrong if the exponent is != 0 and
for negative values.
The driver could enforce direct mode by explicitly configuring EFUSE_CFG,
but that is not guaranteed to work because the chip could be write
protected. It would be necessary to disable write protection first,
making this a bit complicated. Alternatively, the reading of VOUT could
be adjusted in linear mode to linear16 if the chip is configured to
report data in linear mode. I would personally prefer this solution.
Either case, this needs to be handled.
Guenter
@@ -157,6 +157,7 @@ Hardware Monitoring Kernel Drivers
mp2888
mp2975
mp5023
+ mp5990
nct6683
nct6775
nct7802
new file mode 100644
@@ -0,0 +1,84 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mp5990
+====================
+
+Supported chips:
+
+ * MPS MP5990
+
+ Prefix: 'mp5990'
+
+ * Datasheet
+
+ Publicly available at the MPS website : https://www.monolithicpower.com/en/mp5990.html
+
+Author:
+
+ Peter Yin <peteryin.openbmc@gmail.com>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+MP5990 Hot-Swap Controller.
+
+Device compliant with:
+
+- PMBus rev 1.3 interface.
+
+Device supports direct format for reading input voltage, output voltage,
+output current, input power and temperature.
+
+The driver exports the following attributes via the 'sysfs' files
+for input voltage:
+
+**in1_input**
+
+**in1_label**
+
+**in1_max**
+
+**in1_max_alarm**
+
+**in1_min**
+
+**in1_min_alarm**
+
+The driver provides the following attributes for output voltage:
+
+**in2_input**
+
+**in2_label**
+
+**in2_alarm**
+
+The driver provides the following attributes for output current:
+
+**curr1_input**
+
+**curr1_label**
+
+**curr1_alarm**
+
+**curr1_max**
+
+The driver provides the following attributes for input power:
+
+**power1_input**
+
+**power1_label**
+
+**power1_alarm**
+
+The driver provides the following attributes for temperature:
+
+**temp1_input**
+
+**temp1_max**
+
+**temp1_max_alarm**
+
+**temp1_crit**
+
+**temp1_crit_alarm**
@@ -326,6 +326,15 @@ config SENSORS_MP5023
This driver can also be built as a module. If so, the module will
be called mp5023.
+config SENSORS_MP5990
+ tristate "MPS MP5990"
+ help
+ If you say yes here you get hardware monitoring support for MPS
+ MP5990.
+
+ This driver can also be built as a module. If so, the module will
+ be called mp5990.
+
config SENSORS_MPQ7932_REGULATOR
bool "Regulator support for MPQ7932"
depends on SENSORS_MPQ7932 && REGULATOR
@@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
+obj-$(CONFIG_SENSORS_MP5990) += mp5990.o
obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o
obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o
obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
new file mode 100644
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for MPS MP5990 Hot-Swap Controller
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+static int mp5990_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ switch (reg) {
+ case PMBUS_VOUT_MODE:
+ /* The datasheet does not support the VOUT command,
+ * but the device responds with a default value of 0x17.
+ * In the standard, 0x17 represents linear mode. However,
+ * for the MP5990, the VOUT linear mode is linear11, not linear16.
+ * Therefore, we should enforce the VOUT in the direct format.
+ */
+ return PB_VOUT_MODE_DIRECT;
+ default:
+ return -ENODATA;
+ }
+}
+
+static struct pmbus_driver_info mp5990_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_POWER] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .m[PSC_VOLTAGE_IN] = 32,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 0,
+ .m[PSC_VOLTAGE_OUT] = 32,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 0,
+ .m[PSC_CURRENT_OUT] = 16,
+ .b[PSC_CURRENT_OUT] = 0,
+ .R[PSC_CURRENT_OUT] = 0,
+ .m[PSC_POWER] = 1,
+ .b[PSC_POWER] = 0,
+ .R[PSC_POWER] = 0,
+ .m[PSC_TEMPERATURE] = 1,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 0,
+ .func[0] =
+ PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT |
+ PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+ .read_byte_data = mp5990_read_byte_data,
+};
+
+static int mp5990_probe(struct i2c_client *client)
+{
+ return pmbus_do_probe(client, &mp5990_info);
+}
+
+static const struct of_device_id mp5990_of_match[] = {
+ { .compatible = "mps,mp5990" },
+ {}
+};
+
+static const struct i2c_device_id mp5990_id[] = {
+ {"mp5990", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, mp5990_id);
+
+static struct i2c_driver mp5990_driver = {
+ .driver = {
+ .name = "mp5990",
+ .of_match_table = mp5990_of_match,
+ },
+ .probe = mp5990_probe,
+ .id_table = mp5990_id,
+};
+module_i2c_driver(mp5990_driver);
+
+MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
+MODULE_DESCRIPTION("PMBus driver for MP5990 HSC");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);