diff options
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 8 | ||||
| -rw-r--r-- | include/linux/pmbus.h | 9 |
2 files changed, 14 insertions, 3 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 01a1ffc74bb6..a5367df1cee8 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -2231,9 +2231,11 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data, * faults, and we should not try it. Also, in that case, writes into * limit registers need to be disabled. */ - ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT); - if (ret > 0 && (ret & PB_WP_ANY)) - data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK; + if (!(data->flags & PMBUS_NO_WRITE_PROTECT)) { + ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT); + if (ret > 0 && (ret & PB_WP_ANY)) + data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK; + } if (data->info->pages) pmbus_clear_faults(client); diff --git a/include/linux/pmbus.h b/include/linux/pmbus.h index edd7c84fef65..12c515a27d3a 100644 --- a/include/linux/pmbus.h +++ b/include/linux/pmbus.h @@ -56,6 +56,15 @@ */ #define PMBUS_READ_STATUS_AFTER_FAILED_CHECK BIT(3) +/* + * PMBUS_NO_WRITE_PROTECT + * + * Some PMBus chips respond with invalid data when reading the WRITE_PROTECT + * register. For such chips, this flag should be set so that the PMBus core + * driver doesn't use the WRITE_PROTECT command to determine its behavior. + */ +#define PMBUS_NO_WRITE_PROTECT BIT(4) + struct pmbus_platform_data { u32 flags; /* Device specific flags */ |