[PATCH v2 2/4] hwmon: add MP2869 series driver

wenswang
2025-07-01T10:00:45Z

Add support for MPS VR mp2869 series controller. This driver exposes
telemetry and limit value readings and writtings.

Signed-off-by: Wensheng Wang <wenswang@yeah.net>
---
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/mp2869.rst | 175 ++++++++
MAINTAINERS | 7 +
drivers/hwmon/pmbus/Kconfig | 9 +
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/mp2869.c | 711 +++++++++++++++++++++++++++++++++
6 files changed, 904 insertions(+)
create mode 100644 Documentation/hwmon/mp2869.rst
create mode 100644 drivers/hwmon/pmbus/mp2869.c

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index b45bfb4ebf30..7e278aa0aac3 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -172,6 +172,7 @@ Hardware Monitoring Kernel Drivers
menf21bmc
mlxreg-fan
mp2856
+ mp2869
mp2888
mp2891
mp2975
diff --git a/Documentation/hwmon/mp2869.rst b/Documentation/hwmon/mp2869.rst
new file mode 100644
index 000000000000..2d9d65fc86b6
--- /dev/null
+++ b/Documentation/hwmon/mp2869.rst
@@ -0,0 +1,175 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mp2869
+====================
+
+Supported chips:
+
+ * MPS mp2869
+
+ Prefix: 'mp2869'
+
+ * MPS mp29608
+
+ Prefix: 'mp29608'
+
+ * MPS mp29612
+
+ Prefix: 'mp29612'
+
+ * MPS mp29816
+
+ Prefix: 'mp29816'
+
+Author:
+
+ Wensheng Wang <wenswang@yeah.net>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+MP2869 Dual Loop Digital Multi-phase Controller.
+
+Device compliant with:
+
+- PMBus rev 1.3 interface.
+
+The driver exports the following attributes via the 'sysfs' files
+for input voltage:
+
+**in1_input**
+
+**in1_label**
+
+**in1_crit**
+
+**in1_crit_alarm**
+
+**in1_lcrit**
+
+**in1_lcrit_alarm**
+
+**in1_min**
+
+**in1_min_alarm**
+
+The driver provides the following attributes for output voltage:
+
+**in2_input**
+
+**in2_label**
+
+**in2_crit**
+
+**in2_crit_alarm**
+
+**in2_lcrit**
+
+**in2_lcrit_alarm**
+
+**in3_input**
+
+**in3_label**
+
+**in3_crit**
+
+**in3_crit_alarm**
+
+**in3_lcrit**
+
+**in3_lcrit_alarm**
+
+The driver provides the following attributes for input current:
+
+**curr1_input**
+
+**curr1_label**
+
+**curr2_input**
+
+**curr2_label**
+
+The driver provides the following attributes for output current:
+
+**curr3_input**
+
+**curr3_label**
+
+**curr3_crit**
+
+**curr3_crit_alarm**
+
+**curr3_max**
+
+**curr3_max_alarm**
+
+**curr4_input**
+
+**curr4_label**
+
+**curr4_crit**
+
+**curr4_crit_alarm**
+
+**curr4_max**
+
+**curr4_max_alarm**
+
+The driver provides the following attributes for input power:
+
+**power1_input**
+
+**power1_label**
+
+**power2_input**
+
+**power2_label**
+
+The driver provides the following attributes for output power:
+
+**power3_input**
+
+**power3_label**
+
+**power3_input**
+
+**power3_label**
+
+**power3_max**
+
+**power3_max_alarm**
+
+**power4_input**
+
+**power4_label**
+
+**power4_input**
+
+**power4_label**
+
+**power4_max**
+
+**power4_max_alarm**
+
+The driver provides the following attributes for temperature:
+
+**temp1_input**
+
+**temp1_crit**
+
+**temp1_crit_alarm**
+
+**temp1_max**
+
+**temp1_max_alarm**
+
+**temp2_input**
+
+**temp2_crit**
+
+**temp2_crit_alarm**
+
+**temp2_max**
+
+**temp2_max_alarm**
diff --git a/MAINTAINERS b/MAINTAINERS
index 4bac4ea21b64..6436a4737e2e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16879,6 +16879,13 @@ S: Maintained
F: Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml
F: drivers/video/backlight/mp3309c.c

+MPS MP2869 DRIVER
+M: Wensheng Wang <wenswang@yeah.net>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/hwmon/mp2869.rst
+F: drivers/hwmon/pmbus/mp2869.c
+
MPS MP2891 DRIVER
M: Noah Wang <noahwang.wang@outlook.com>
L: linux-hwmon@vger.kernel.org
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 441f984a859d..f3bf7b7fb76d 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -364,6 +364,15 @@ config SENSORS_MP2856
This driver can also be built as a module. If so, the module will
be called mp2856.

+config SENSORS_MP2869
+ tristate "MPS MP2869"
+ help
+ If you say yes here you get hardware monitoring support for MPS
+ MP2869 Dual Loop Digital Multi-Phase Controller.
+
+ This driver can also be built as a module. If so, the module will
+ be called mp2869.
+
config SENSORS_MP2888
tristate "MPS MP2888"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 29cd8a3317d2..6177047414ee 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2856) += mp2856.o
+obj-$(CONFIG_SENSORS_MP2869) += mp2869.o
obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
obj-$(CONFIG_SENSORS_MP2891) += mp2891.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
diff --git a/drivers/hwmon/pmbus/mp2869.c b/drivers/hwmon/pmbus/mp2869.c
new file mode 100644
index 000000000000..af233ffd5230
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp2869.c
@@ -0,0 +1,711 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2869)
+ */
+
+#include <linux/bitfield.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include "pmbus.h"
+
+#define MFR_READ_PIN_EST 0x94
+#define MFR_READ_IIN_EST 0x95
+#define MFR_VOUT_SCALE_LOOP 0x29
+#define MFR_SVI3_IOUT_PRT 0x67
+#define STATUS_MFR_SPECIFIC 0x80
+#define MFR_CUR_GAIN 0xB5
+#define MFR_TSNS_FLT_SET 0xBB
+
+#define MP2869_VIN_OV_FAULT_GAIN 4
+#define MP2869_READ_VOUT_DIV 1024
+#define MP2869_READ_IOUT_DIV 32
+#define MP2869_OVUV_LIMIT_SCALE 10
+#define MP2869_OVUV_DELTA_SCALE 50
+#define MP2869_TEMP_LIMIT_OFFSET 40
+#define MP2869_IOUT_LIMIT_UINT 8
+#define MP2869_POUT_OP_GAIN 2
+
+#define MP2869_PAGE_NUM 2
+
+#define MP2869_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \
+ PMBUS_HAVE_IIN | \
+ PMBUS_HAVE_STATUS_VOUT | \
+ PMBUS_HAVE_STATUS_IOUT | \
+ PMBUS_HAVE_STATUS_TEMP | \
+ PMBUS_HAVE_STATUS_INPUT)
+
+#define MP2869_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \
+ PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \
+ PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | \
+ PMBUS_HAVE_STATUS_VOUT | \
+ PMBUS_HAVE_STATUS_IOUT | \
+ PMBUS_HAVE_STATUS_TEMP | \
+ PMBUS_HAVE_STATUS_INPUT)
+
+enum chips {mp2869, mp29608, mp29612, mp29816};
+
+struct mp2869_data {
+ struct pmbus_driver_info info;
+ bool mfr_thwn_flt_en;
+ int vout_scale[MP2869_PAGE_NUM];
+ int iout_scale[MP2869_PAGE_NUM];
+};
+
+#define to_mp2869_data(x) container_of(x, struct mp2869_data, info)
+
+static u16 mp2869_reg2data_linear11(u16 word)
+{
+ s16 exponent;
+ s32 mantissa;
+ s64 val;
+
+ exponent = ((s16)word) >> 11;
+ mantissa = ((s16)((word & 0x7ff) << 5)) >> 5;
+ val = mantissa;
+
+ if (exponent >= 0)
+ val <<= exponent;
+ else
+ val >>= -exponent;
+
+ return val;
+}
+
+static int
+mp2869_identify_thwn_flt(struct i2c_client *client, struct pmbus_driver_info *info,
+ int page)
+{
+ struct mp2869_data *data = to_mp2869_data(info);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_word_data(client, MFR_TSNS_FLT_SET);
+ if (ret < 0)
+ return ret;
+
+ if (FIELD_GET(GENMASK(13, 13), ret))
+ data->mfr_thwn_flt_en = true;
+ else
+ data->mfr_thwn_flt_en = false;
+
+ return 0;
+}
+
+static int
+mp2869_identify_vout_scale(struct i2c_client *client, struct pmbus_driver_info *info,
+ int page)
+{
+ struct mp2869_data *data = to_mp2869_data(info);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_word_data(client, MFR_VOUT_SCALE_LOOP);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The output voltage is equal to the READ_VOUT(0x8B) register value multiply
+ * by vout_scale.
+ * Obtain vout scale from the register MFR_VOUT_SCALE_LOOP, bits 12-10
+ * MFR_VOUT_SCALE_LOOP[12:10]:
+ * 000b - 6.25mV/LSB, 001b - 5mV/LSB, 010b - 2.5mV/LSB, 011b - 2mV/LSB
+ * 100b - 1mV/Lsb, 101b - (1/256)mV/LSB, 110b - (1/512)mV/LSB,
+ * 111b - (1/1024)mV/LSB
+ */
+ switch (FIELD_GET(GENMASK(12, 10), ret)) {
+ case 0:
+ data->vout_scale[page] = 6400;
+ break;
+ case 1:
+ data->vout_scale[page] = 5120;
+ break;
+ case 2:
+ data->vout_scale[page] = 2560;
+ break;
+ case 3:
+ data->vout_scale[page] = 2048;
+ break;
+ case 4:
+ data->vout_scale[page] = 1024;
+ break;
+ case 5:
+ data->vout_scale[page] = 4;
+ break;
+ case 6:
+ data->vout_scale[page] = 2;
+ break;
+ case 7:
+ data->vout_scale[page] = 1;
+ break;
+ default:
+ data->vout_scale[page] = 1;
+ break;
+ }
+
+ return 0;
+}
+
+static int
+mp2869_identify_iout_scale(struct i2c_client *client, struct pmbus_driver_info *info,
+ int page)
+{
+ struct mp2869_data *data = to_mp2869_data(info);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_word_data(client, MFR_SVI3_IOUT_PRT);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The output current is equal to the READ_IOUT(0x8C) register value
+ * multiply by iout_scale.
+ * Obtain iout_scale from the register MFR_SVI3_IOUT_PRT[2:0].
+ * The value is selected as below:
+ * 000b - 1A/LSB, 001b - (1/32)A/LSB, 010b - (1/16)A/LSB,
+ * 011b - (1/8)A/LSB, 100b - (1/4)A/LSB, 101b - (1/2)A/LSB
+ * 110b - 1A/LSB, 111b - 2A/LSB
+ */
+ switch (ret & GENMASK(2, 0)) {
+ case 0:
+ case 6:
+ data->iout_scale[page] = 32;
+ break;
+ case 1:
+ data->iout_scale[page] = 1;
+ break;
+ case 2:
+ data->iout_scale[page] = 2;
+ break;
+ case 3:
+ data->iout_scale[page] = 4;
+ break;
+ case 4:
+ data->iout_scale[page] = 8;
+ break;
+ case 5:
+ data->iout_scale[page] = 16;
+ break;
+ default:
+ data->iout_scale[page] = 64;
+ break;
+ }
+
+ return 0;
+}
+
+static int mp2869_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct mp2869_data *data = to_mp2869_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VOUT_MODE:
+ /*
+ * The calculation of vout in this driver is based on direct format.
+ * As a result, the format of vout is enforced to direct.
+ */
+ ret = PB_VOUT_MODE_DIRECT;
+ break;
+ case PMBUS_STATUS_BYTE:
+ /*
+ * If the tsns digital fault is enabled, the TEMPERATURE flag
+ * of PMBUS_STATUS_BYTE should come from STATUS_MFR_SPECIFIC
+ * register bit1.
+ */
+ if (data->mfr_thwn_flt_en) {
+ ret = pmbus_read_byte_data(client, page, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & ~GENMASK(2, 2)) |
+ FIELD_PREP(GENMASK(2, 2),
+ FIELD_GET(GENMASK(1, 1),
+ pmbus_read_byte_data(client, page,
+ STATUS_MFR_SPECIFIC)));
+ } else {
+ ret = -ENODATA;
+ }
+ break;
+ case PMBUS_STATUS_TEMPERATURE:
+ /*
+ * If the tsns digital fault is enabled, the OT Fault and OT Warning
+ * flag of PMBUS_STATUS_TEMPERATURE should come from STATUS_MFR_SPECIFIC
+ * register bit1.
+ */
+ if (data->mfr_thwn_flt_en) {
+ ret = pmbus_read_byte_data(client, page, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & ~GENMASK(7, 6)) |
+ FIELD_PREP(GENMASK(6, 6),
+ FIELD_GET(GENMASK(1, 1),
+ pmbus_read_byte_data(client, page,
+ STATUS_MFR_SPECIFIC))) |
+ FIELD_PREP(GENMASK(7, 7),
+ FIELD_GET(GENMASK(1, 1),
+ pmbus_read_byte_data(client, page,
+ STATUS_MFR_SPECIFIC)));
+ } else {
+ ret = -ENODATA;
+ }
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+
+ return ret;
+}
+
+static int mp2869_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 mp2869_data *data = to_mp2869_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_STATUS_WORD:
+ /*
+ * If the tsns digital fault is enabled, the OT Fault flag
+ * of PMBUS_STATUS_WORD should come from STATUS_MFR_SPECIFIC
+ * register bit1.
+ */
+ if (data->mfr_thwn_flt_en) {
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & ~GENMASK(2, 2)) |
+ FIELD_PREP(GENMASK(2, 2),
+ FIELD_GET(GENMASK(1, 1),
+ pmbus_read_byte_data(client, page,
+ STATUS_MFR_SPECIFIC)));
+ } else {
+ ret = -ENODATA;
+ }
+ break;
+ case PMBUS_READ_VIN:
+ /*
+ * The MP2869 PMBUS_READ_VIN[10:0] is the vin value, the vin scale is
+ * 31.25mV/LSB. And the vin scale is set to 31.25mV/Lsb(using r/m/b scale)
+ * in MP2869 pmbus_driver_info struct, so the word data bit0-bit10 can be
+ * returned to pmbus core directly.
+ */
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = FIELD_GET(GENMASK(10, 0), ret);
+ break;
+ case PMBUS_READ_IIN:
+ /*
+ * The MP2869 redefine the standard 0x95 register as iin telemetry
+ * per rail.
+ */
+ ret = pmbus_read_word_data(client, page, phase, MFR_READ_IIN_EST);
+ if (ret < 0)
+ return ret;
+
+ break;
+ case PMBUS_READ_PIN:
+ /*
+ * The MP2869 redefine the standard 0x94 register as pin telemetry
+ * per rail. The MP2869 MFR_READ_PIN_EST register is linear11 format,
+ * but the pin scale is set to 1W/Lsb(using r/m/b scale). As a result,
+ * the pin read from MP2869 should be converted to W, then return
+ * the result to pmbus core.
+ */
+ ret = pmbus_read_word_data(client, page, phase, MFR_READ_PIN_EST);
+ if (ret < 0)
+ return ret;
+
+ ret = mp2869_reg2data_linear11(ret);
+ break;
+ case PMBUS_READ_VOUT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = DIV_ROUND_CLOSEST((ret & GENMASK(11, 0)) * data->vout_scale[page],
+ MP2869_READ_VOUT_DIV);
+ break;
+ case PMBUS_READ_IOUT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = DIV_ROUND_CLOSEST((ret & GENMASK(10, 0)) * data->iout_scale[page],
+ MP2869_READ_IOUT_DIV);
+ break;
+ case PMBUS_READ_POUT:
+ /*
+ * The MP2869 PMBUS_READ_POUT register is linear11 format, but the pout
+ * scale is set to 1W/Lsb(using r/m/b scale). As a result, the pout read
+ * from MP2869 should be converted to W, then return the result to pmbus
+ * core.
+ */
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = mp2869_reg2data_linear11(ret);
+ break;
+ case PMBUS_READ_TEMPERATURE_1:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = FIELD_GET(GENMASK(10, 0), ret);
+ break;
+ case PMBUS_VOUT_OV_FAULT_LIMIT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ if (FIELD_GET(GENMASK(12, 9), ret))
+ ret = FIELD_GET(GENMASK(8, 0), ret) * MP2869_OVUV_LIMIT_SCALE +
+ (FIELD_GET(GENMASK(12, 9), ret) + 1) * MP2869_OVUV_DELTA_SCALE;
+ else
+ ret = FIELD_GET(GENMASK(8, 0), ret) * MP2869_OVUV_LIMIT_SCALE;
+ break;
+ case PMBUS_VOUT_UV_FAULT_LIMIT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ if (FIELD_GET(GENMASK(12, 9), ret))
+ ret = FIELD_GET(GENMASK(8, 0), ret) * MP2869_OVUV_LIMIT_SCALE -
+ (FIELD_GET(GENMASK(12, 9), ret) + 1) * MP2869_OVUV_DELTA_SCALE;
+ else
+ ret = FIELD_GET(GENMASK(8, 0), ret) * MP2869_OVUV_LIMIT_SCALE;
+
+ ret = ret < 0 ? 0 : ret;
+ break;
+ case PMBUS_OT_FAULT_LIMIT:
+ case PMBUS_OT_WARN_LIMIT:
+ /*
+ * The scale of MP2869 PMBUS_OT_FAULT_LIMIT and PMBUS_OT_WARN_LIMIT
+ * is 1°C/LSB and they have 40°C offset.
+ */
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & GENMASK(7, 0)) - MP2869_TEMP_LIMIT_OFFSET;
+ break;
+ case PMBUS_VIN_OV_FAULT_LIMIT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & GENMASK(7, 0)) * MP2869_VIN_OV_FAULT_GAIN;
+ break;
+ case PMBUS_VIN_UV_WARN_LIMIT:
+ case PMBUS_VIN_UV_FAULT_LIMIT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = FIELD_GET(GENMASK(9, 0), ret);
+ break;
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * data->iout_scale[page] *
+ MP2869_IOUT_LIMIT_UINT, MP2869_READ_IOUT_DIV);
+ break;
+ case PMBUS_POUT_OP_WARN_LIMIT:
+ ret = pmbus_read_word_data(client, page, phase, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & GENMASK(7, 0)) * MP2869_POUT_OP_GAIN;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int mp2869_write_word_data(struct i2c_client *client, int page, int reg,
+ u16 word)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ struct mp2869_data *data = to_mp2869_data(info);
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VOUT_UV_FAULT_LIMIT:
+ /*
+ * The MP2869 PMBUS_VOUT_UV_FAULT_LIMIT[8:0] is the limit value,
+ * and bit9-bit15 should not be changed.
+ */
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ if (ret < 0)
+ return ret;
+
+ if (FIELD_GET(GENMASK(12, 9), ret))
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(8, 0)) |
+ FIELD_PREP(GENMASK(8, 0),
+ DIV_ROUND_CLOSEST(word +
+ (FIELD_GET(GENMASK(12, 9),
+ ret) + 1) *
+ MP2869_OVUV_DELTA_SCALE,
+ MP2869_OVUV_LIMIT_SCALE)));
+ else
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(8, 0)) |
+ FIELD_PREP(GENMASK(8, 0),
+ DIV_ROUND_CLOSEST(word,
+ MP2869_OVUV_LIMIT_SCALE)));
+ break;
+ case PMBUS_VOUT_OV_FAULT_LIMIT:
+ /*
+ * The MP2869 PMBUS_VOUT_OV_FAULT_LIMIT[8:0] is the limit value,
+ * and bit9-bit15 should not be changed.
+ */
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ if (ret < 0)
+ return ret;
+
+ if (FIELD_GET(GENMASK(12, 9), ret))
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(8, 0)) |
+ FIELD_PREP(GENMASK(8, 0),
+ DIV_ROUND_CLOSEST(word -
+ (FIELD_GET(GENMASK(12, 9),
+ ret) + 1) *
+ MP2869_OVUV_DELTA_SCALE,
+ MP2869_OVUV_LIMIT_SCALE)));
+ else
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(8, 0)) |
+ FIELD_PREP(GENMASK(8, 0),
+ DIV_ROUND_CLOSEST(word,
+ MP2869_OVUV_LIMIT_SCALE)));
+ break;
+ case PMBUS_OT_FAULT_LIMIT:
+ case PMBUS_OT_WARN_LIMIT:
+ /*
+ * If the tsns digital fault is enabled, the PMBUS_OT_FAULT_LIMIT and
+ * PMBUS_OT_WARN_LIMIT can not be written.
+ */
+ if (data->mfr_thwn_flt_en) {
+ ret = -EINVAL;
+ } else {
+ /*
+ * The MP2869 scale of MP2869 PMBUS_OT_FAULT_LIMIT and PMBUS_OT_WARN_LIMIT
+ * have 40°C offset. The bit0-bit7 is the limit value, and bit8-bit15
+ * should not be changed.
+ */
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(7, 0)) |
+ FIELD_PREP(GENMASK(7, 0),
+ word + MP2869_TEMP_LIMIT_OFFSET));
+ }
+ break;
+ case PMBUS_VIN_OV_FAULT_LIMIT:
+ /*
+ * The MP2869 PMBUS_VIN_OV_FAULT_LIMIT[7:0] is the limit value, and bit8-bit15
+ * should not be changed. The scale of PMBUS_VIN_OV_FAULT_LIMIT is 125mV/Lsb,
+ * but the vin scale is set to 31.25mV/Lsb(using r/m/b scale), so the word data
+ * should divide by MP2869_VIN_OV_FAULT_GAIN(4)
+ */
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(7, 0)) |
+ FIELD_PREP(GENMASK(7, 0),
+ DIV_ROUND_CLOSEST(word,
+ MP2869_VIN_OV_FAULT_GAIN)));
+ break;
+ case PMBUS_VIN_UV_WARN_LIMIT:
+ case PMBUS_VIN_UV_FAULT_LIMIT:
+ /*
+ * The PMBUS_VIN_UV_LIMIT[9:0] is the limit value, and bit10-bit15 should
+ * not be changed. The scale of PMBUS_VIN_UV_LIMIT is 31.25mV/Lsb, and the
+ * vin scale is set to 31.25mV/Lsb(using r/m/b scale), so the word data can
+ * be written directly.
+ */
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(9, 0)) |
+ FIELD_PREP(GENMASK(9, 0),
+ word));
+ break;
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_WARN_LIMIT:
+ ret = pmbus_write_word_data(client, page, reg,
+ DIV_ROUND_CLOSEST(word *
+ MP2869_READ_IOUT_DIV,
+ MP2869_IOUT_LIMIT_UINT *
+ data->iout_scale[page]));
+ break;
+ case PMBUS_POUT_OP_WARN_LIMIT:
+ /*
+ * The POUT_OP_WARN_LIMIT[11:0] is the limit value, and bit12-bit15 should
+ * not be changed. The scale of POUT_OP_WARN_LIMIT is 2W/Lsb.
+ */
+ ret = pmbus_read_word_data(client, page, 0xff, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = pmbus_write_word_data(client, page, reg,
+ (ret & ~GENMASK(11, 0)) |
+ FIELD_PREP(GENMASK(11, 0),
+ DIV_ROUND_CLOSEST(word,
+ MP2869_POUT_OP_GAIN)));
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int mp2869_identify(struct i2c_client *client, struct pmbus_driver_info *info)
+{
+ int ret;
+
+ /* Identify whether tsns digital fault is enable */
+ ret = mp2869_identify_thwn_flt(client, info, 1);
+ if (ret < 0)
+ return 0;
+
+ /* Identify vout scale for rail1. */
+ ret = mp2869_identify_vout_scale(client, info, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Identify vout scale for rail2. */
+ ret = mp2869_identify_vout_scale(client, info, 1);
+ if (ret < 0)
+ return ret;
+
+ /* Identify iout scale for rail 1. */
+ ret = mp2869_identify_iout_scale(client, info, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Identify iout scale for rail 2. */
+ return mp2869_identify_iout_scale(client, info, 1);
+}
+
+static const struct pmbus_driver_info mp2869_info = {
+ .pages = MP2869_PAGE_NUM,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_CURRENT_OUT] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .format[PSC_POWER] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+
+ .m[PSC_VOLTAGE_IN] = 32,
+ .R[PSC_VOLTAGE_IN] = 0,
+ .b[PSC_VOLTAGE_IN] = 0,
+
+ .m[PSC_VOLTAGE_OUT] = 1,
+ .R[PSC_VOLTAGE_OUT] = 3,
+ .b[PSC_VOLTAGE_OUT] = 0,
+
+ .m[PSC_CURRENT_OUT] = 1,
+ .R[PSC_CURRENT_OUT] = 0,
+ .b[PSC_CURRENT_OUT] = 0,
+
+ .m[PSC_TEMPERATURE] = 1,
+ .R[PSC_TEMPERATURE] = 0,
+ .b[PSC_TEMPERATURE] = 0,
+
+ .m[PSC_POWER] = 1,
+ .R[PSC_POWER] = 0,
+ .b[PSC_POWER] = 0,
+
+ .func[0] = MP2869_RAIL1_FUNC,
+ .func[1] = MP2869_RAIL2_FUNC,
+ .read_word_data = mp2869_read_word_data,
+ .write_word_data = mp2869_write_word_data,
+ .read_byte_data = mp2869_read_byte_data,
+ .identify = mp2869_identify,
+};
+
+static int mp2869_probe(struct i2c_client *client)
+{
+ struct pmbus_driver_info *info;
+ struct mp2869_data *data;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct mp2869_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ memcpy(&data->info, &mp2869_info, sizeof(*info));
+ info = &data->info;
+
+ return pmbus_do_probe(client, info);
+}
+
+static const struct i2c_device_id mp2869_id[] = {
+ {"mp2869", mp2869},
+ {"mp29608", mp29608},
+ {"mp29612", mp29612},
+ {"mp29816", mp29816},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, mp2869_id);
+
+static const struct of_device_id __maybe_unused mp2869_of_match[] = {
+ {.compatible = "mps,mp2869", .data = (void *)mp2869},
+ {.compatible = "mps,mp29608", .data = (void *)mp29608},
+ {.compatible = "mps,mp29612", .data = (void *)mp29612},
+ {.compatible = "mps,mp29816", .data = (void *)mp29816},
+ {}
+};
+MODULE_DEVICE_TABLE(of, mp2869_of_match);
+
+static struct i2c_driver mp2869_driver = {
+ .driver = {
+ .name = "mp2869",
+ .of_match_table = mp2869_of_match,
+ },
+ .probe = mp2869_probe,
+ .id_table = mp2869_id,
+};
+
+module_i2c_driver(mp2869_driver);
+
+MODULE_AUTHOR("Wensheng Wang <wenswang@yeah.net>");
+MODULE_DESCRIPTION("PMBus driver for MPS MP2869");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.25.1