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hwmon: (pmbus) Add new pmbus flag 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.

Signed-off-by: Erik Rosen <erik.rosen@metormote.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Erik Rosen 2021-06-09 11:32:05 +02:00 committed by Guenter Roeck
parent ff53b77e1e
commit dbc0860f7a
2 changed files with 14 additions and 3 deletions
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8
drivers/hwmon/pmbus/pmbus_core.c
View File

@ -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);

9
include/linux/pmbus.h
View File

@ -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 */