Re: [PATCH v1 2/2] hwmon: (pmbus) Add support for MPS Multi-phase mp5990
From: PeterYin
Date: Mon Nov 06 2023 - 03:05:19 EST
Guenter Roeck 於 11/3/23 22:35 寫道:
On 11/3/23 01:01, 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@xxxxxxxxx>
---
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 | 90 ++++++++++++++++++++++++++++++++++
5 files changed, 185 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..8fc4e388ff7b
--- /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@xxxxxxxxx>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+MP5990 Hot-Swap Controller.
+
+Device complaint with:
compliant
Thanks, I will fix it.
+
+- 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**
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..c3b31af9f750
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp5990.c
@@ -0,0 +1,90 @@
+// 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:
+ /*
+ Enforce VOUT direct format, C4h reg BIT9
+ default val is not match vout format
+ */
/*
* Please use proper multi-line comments. Also, the problem here is
that the
* chip does not support the VOUT_MODE command, which should be mentioned.
*
* On top of that, overwriting PMBUS_VOUT_MODE result from the chip is
only
* necessary if the chip does not return an error when reading the value.
* If that is the case, it should be mentioned in the comment. The above
* does not explain why this would be needed, even if the command is not
* (officially) supported by the chip. What does it return that requires
* an overwrite ?
*/
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.
+ 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)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE,
+ PB_VOUT_MODE_DIRECT);
According to the datasheet, the chip does not support the VOUT_MODE
command. Supposedly, direct vs. linear mode is selected with bit 9
of EFUSE_CFG. Even if the chip happens to "silently" support the command,
the official command should be used to select the chip mode.
Next question: Why use direct mode ? Linear mode is supported and would
be much more flexible.
The MP5990, the VOUT linear mode is linear11, not linear16. Therefore,
we should enforce the VOUT in the direct format.
+ if (ret < 0)
+ return ret;
+ 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 = of_match_ptr(mp5990_of_match),
Using of_match_ptr() will result in a build failure if CONFIG_OF=n.
Should I use .of_match_table = mp5990_of_match, ?
+ },
+ .probe = mp5990_probe,
+ .id_table = mp5990_id,
+};
+module_i2c_driver(mp5990_driver);
+
+MODULE_AUTHOR("Peter Yin <peter.yin@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PMBus driver for MP5990 HSC");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);