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charset="utf-8" Content-Transfer-Encoding: 8bit Message-ID: <20260630-dev-max20830c-v1-4-a02786bde470@analog.com> References: <20260630-dev-max20830c-v1-0-a02786bde470@analog.com> In-Reply-To: <20260630-dev-max20830c-v1-0-a02786bde470@analog.com> To: Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Shuah Khan CC: , , , , Alexis Czezar Torreno X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1782787612; l=3163; i=alexisczezar.torreno@analog.com; s=20250213; h=from:subject:message-id; bh=f9oNKMFaLUsKSvsWwcjf/TtW8SwoVUzXhsa4vp5q5PA=; b=QwLwFOhRyxOPwh0gPmZXdCbK0o2M6X32FPyb7cyo9nhy5vQt4TVQID+et4iBALwJG3QjAue4d jQZdki2qmQbAQmIZn1Z1NlnDBrOpJWeevmKqSKwl8oTc1u538PBXrZ/ X-Developer-Key: i=alexisczezar.torreno@analog.com; a=ed25519; pk=XpXmJnRjnsKdDil6YpOlj9+44S+XYXVFnxvkbmaZ+10= X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-ORIG-GUID: 6hX4SFapJbOfZKaAtBNN06TZZYKzEBrW X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjMwMDAyNCBTYWx0ZWRfX8MFkDursTnRJ /UnAlSVNZZtYRLVe/2U/hMY714My0ZG6bjjRoxBupUAlVC1uqzTEiehPF8MaE616LZeP96FNCg6 D5oTkyaihnV9aIElenvQrWcEXKhVZ3j57LtYg2ioofwVcuOg2jhKt//p1SFwdhoESkmuck1kT3L pFkMqmV56p+mxEOD1Sbh69cb+IUjpUl+3yh61R4tl+midMLHf3LjHwwMBOk+zcxtLPRd1bMowBG JVVEXwmpNh4q7/CvzosZxmzh7S/VULf+I+Fij19CS/FJWo7dOczu0ohu2DzIYWLsYRY2pJDVIkq rApLJtOhfvLguUsyxtwnPOYqh4D+XZ7t1H2Z4UREnaSF9cR+tcH/jsQgMZ5mKxctrQh5+GPVjAa X0uQYmQJYW3O1i9L46tWk49zc//9/yI62slusQMg2GVobbkxKbtuGE9rm6GKgd90yd5CvIdRvlA LEWEmIBDHOP4MmARQww== X-Proofpoint-GUID: 6hX4SFapJbOfZKaAtBNN06TZZYKzEBrW X-Proofpoint-Spam-Info: AW1haW4tMjYwNjMwMDAyNCBTYWx0ZWRfX+ouBakEiOjbZ ZP93TVkIhZhuFD5yIlf16eyteJpZmHw93+uDCAi1E4KobkOEY/YGDmjqL417Lm9yStVm/S6nYrx wz4f6eaijKQ37CgK8wHgwRuAWXFCVzRKP/7sky5wqk0MVgrecBCR X-Authority-Analysis: v=2.4 cv=R8cz39RX c=1 sm=1 tr=0 ts=6a432e3b cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=OmVn7CZJonkx5R5zMQLL:22 a=gAnH3GRIAAAA:8 a=zpM2bklHJMWzOH9SUnQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-30_01,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 bulkscore=0 spamscore=0 clxscore=1015 phishscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606300024 Implement support for external voltage divider scaling using the adi,vout-rfb1-ohms and adi,vout-rfb2-ohms device tree properties. When the desired output voltage exceeds VREF, a resistor divider (RFB1 and RFB2) is used to scale down the feedback voltage. The driver reads these resistor values from device tree and applies the scaling formula: VOUT_actual = VOUT_measured × (1 + RFB1/RFB2) The properties are optional. If not specified, the driver assumes no voltage divider is present and reports the raw VOUT reading. Signed-off-by: Alexis Czezar Torreno --- drivers/hwmon/pmbus/max20830.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c index cb3a39d747edee3aefb0fb4051ef957436b3c15b..a3abd24437e8e7560264aad55fc4f456d30ae235 100644 --- a/drivers/hwmon/pmbus/max20830.c +++ b/drivers/hwmon/pmbus/max20830.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -15,6 +16,35 @@ #define MAX20830_IC_DEVICE_ID_LENGTH 9 +struct max20830_data { + struct pmbus_driver_info info; + u32 vout_rfb1; + u32 vout_rfb2; +}; + +static int max20830_read_word_data(struct i2c_client *client, int page, + int phase, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + const struct max20830_data *data = container_of(info, struct max20830_data, info); + int ret; + + switch (reg) { + case PMBUS_READ_VOUT: + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + + /* Apply voltage divider scaling if resistors are non-zero */ + if (data->vout_rfb1 && data->vout_rfb2) + ret = DIV_ROUND_CLOSEST_ULL((u64)ret * (data->vout_rfb1 + + data->vout_rfb2), data->vout_rfb2); + return ret; + default: + return -ENODATA; + } +} + static struct pmbus_driver_info max20830_info = { .pages = 1, .format[PSC_VOLTAGE_IN] = linear, @@ -25,14 +55,26 @@ static struct pmbus_driver_info max20830_info = { PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, + .read_word_data = max20830_read_word_data, }; static int max20830_probe(struct i2c_client *client) { u8 buf[I2C_SMBUS_BLOCK_MAX + 1] = {}; + struct max20830_data *data; struct gpio_desc *enable_gpio; int ret; + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->info = max20830_info; + + /* Read optional voltage divider resistor values */ + device_property_read_u32(&client->dev, "adi,vout-rfb1-ohms", &data->vout_rfb1); + device_property_read_u32(&client->dev, "adi,vout-rfb2-ohms", &data->vout_rfb2); + enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); if (IS_ERR(enable_gpio)) return dev_err_probe(&client->dev, PTR_ERR(enable_gpio), -- 2.34.1