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hwmon: (pmbus/tps53679) Select page 0 for single-page TPS53676

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tps53676_identify() derives the number of PMBus pages but does not
ensure that page 0 is selected for single-page configurations.
pmbus_set_page() does not update the PAGE register when info->pages is
1, so if boot firmware leaves PAGE set to another value subsequent
register accesses may target the wrong page.

For single-page devices, select page 0 explicitly.

Fixes: cb3d37b590 ("hwmon: (pmbus/tps53679) Add support for TI TPS53676")
Cc: stable@vger.kernel.org
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
Link: https://patch.msgid.link/20260916235406.681131-2-sanman.pradhan@hpe.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Sanman Pradhan 2026-09-16 23:54:17 +00:00 committed by Guenter Roeck
parent 1d12fb94ac
commit 089070b51c
1 changed files with 9 additions and 0 deletions
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9
drivers/hwmon/pmbus/tps53679.c
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@ -200,6 +200,15 @@ static int tps53676_identify(struct i2c_client *client,
if (phases_b > 0) {
info->pages = 2;
info->phases[1] = phases_b;
} else {
/*
* pmbus_set_page() does not update the PAGE register on
* single-page devices, so select page 0 explicitly in case
* the boot firmware left the device on another page.
*/
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
if (ret < 0)
return ret;
}
return 0;
}