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hwmon: (pmbus/max20830): add support for max20830c and max20840c

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Add support for MAX20830C and MAX20840 step-down DC-DC switching
regulator with PMBus interface. MAX20830C is a different packaging
for MAX20830, and MAX20840C supports 40A regulation compared to
MAX20830 that is only 30A.

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
Link: https://lore.kernel.org/r/20260730-dev-max20830c-v5-4-a7553f84ee74@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexis Czezar Torreno
2026-07-30 09:03:36 +08:00
committed by Guenter Roeck
parent b60e4b3ae1
commit 4cdcd4789f
3 changed files with 47 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
Documentation/hwmon/max20830.rst
View File

@@ -13,6 +13,22 @@ Supported chips:
Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max20830.pdf
* Analog Devices MAX20830C
Prefix: 'max20830c'
Addresses scanned: -
Datasheet:
* Analog Devices MAX20840C
Prefix: 'max20840c'
Addresses scanned: -
Datasheet:
Author:
- Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
@@ -21,12 +37,13 @@ Author:
Description
-----------
This driver supports hardware monitoring for Analog Devices MAX20830
Step-Down Switching Regulator with PMBus Interface.
This driver supports hardware monitoring for Analog Devices MAX20830, MAX20830C
and MAX20840C. These are Step-Down Switching Regulator with PMBus Interface.
The MAX20830 is a 2.7V to 16V, 30A fully integrated step-down DC-DC switching
regulator. Through the PMBus interface, the device can monitor input/output
voltages, output current and temperature.
MAX20830, and MAX20830C are 2.7V to 16V, 30A fully integrated step-down DC-DC
switching regulators. MAX20840C is similar but can reach 40A. Through the PMBus
interface, these devices can monitor input/output voltages, output current and
temperature.
The driver is a client driver to the core PMBus driver. Please see
Documentation/hwmon/pmbus.rst for details on PMBus client drivers.

4
drivers/hwmon/pmbus/Kconfig
View File

@@ -394,10 +394,10 @@ config SENSORS_MAX20751
be called max20751.
config SENSORS_MAX20830
tristate "Analog Devices MAX20830"
tristate "Analog Devices MAX20830 and compatibles"
help
If you say yes here you get hardware monitoring support for Analog
Devices MAX20830.
Devices MAX20830, MAX20830C, and MAX20840C.
This driver can also be built as a module. If so, the module will
be called max20830.

36
drivers/hwmon/pmbus/max20830.c
View File

@@ -20,6 +20,12 @@ struct max20830_data {
u32 vout_rfb2;
};
static const char * const supported_chip_ids[] = {
"MAX20830",
"MAX20830C",
"MAX20840C",
};
/*
* MAX20830 only supports READ_VOUT for VOUT monitoring.
*
@@ -83,7 +89,7 @@ static int max20830_probe(struct i2c_client *client)
{
u8 buf[I2C_SMBUS_BLOCK_MAX + 1] = {};
struct max20830_data *data;
int ret;
int i, ret;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
@@ -105,13 +111,12 @@ static int max20830_probe(struct i2c_client *client)
* which do not support SMBus block reads.
*/
if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
/* Reads 9 Data bytes from MAX20830 */
ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
if (ret < 0)
return dev_err_probe(&client->dev, ret,
"Failed to read IC_DEVICE_ID\n");
} else {
/* Reads 1 length byte + 9 Data bytes from MAX20830 */
/* Reads 1 length byte + data bytes */
ret = i2c_smbus_read_i2c_block_data(client, PMBUS_IC_DEVICE_ID,
MAX20830_IC_DEVICE_ID_LENGTH + 1,
buf);
@@ -127,20 +132,25 @@ static int max20830_probe(struct i2c_client *client)
ret = ret - 1;
}
/*
* MAX20830 IC_DEVICE_ID sends string data "MAX20830\0".
* Return value should at least be 9 bytes of data.
*/
/* Verify we read the expected number of bytes */
if (ret < MAX20830_IC_DEVICE_ID_LENGTH)
return dev_err_probe(&client->dev, -ENODEV,
"IC_DEVICE_ID too short: expected at least 9 bytes, got %d\n",
ret);
"IC_DEVICE_ID too short: expected %d bytes, got %d\n",
MAX20830_IC_DEVICE_ID_LENGTH, ret);
/* 9 bytes of data, buf[0]-buf[7] = "MAX20830", buf[8] = '\0' */
buf[MAX20830_IC_DEVICE_ID_LENGTH - 1] = '\0';
if (strncmp(buf, "MAX20830", MAX20830_IC_DEVICE_ID_LENGTH - 1))
/* Null-terminate the string */
buf[ret] = '\0';
/* Verify the device ID matches what we expect */
for (i = 0; i < ARRAY_SIZE(supported_chip_ids); i++) {
if (!strcmp(buf, supported_chip_ids[i]))
break;
}
/* No match found - unsupported device */
if (i == ARRAY_SIZE(supported_chip_ids))
return dev_err_probe(&client->dev, -ENODEV,
"Unsupported device: '%s'\n", buf);
"Unsupported device: '%*pE'\n", ret, buf);
return pmbus_do_probe(client, &data->info);
}