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hwmon: (pmbus/core) increase number of phases and add new mask

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Increase the number of phases to 16 as a new upcoming device supports
such a number.

While at it, add a new mask for controlling the source of the output
voltage.

Note (groeck):

This patch was meant to prepare for support of MAX20826 and compatible
devices, which support more than 10 phases per page. However, Sashiko
reports that the mp2975 driver already supports up to 14 phases, and the
mp2856 driver supports up to 12 phases. This already has the potential for
out-of-bounds writes when probing the affected chips, making this patch a
bug fix.

Fixes: 2c6fcbb211 ("hwmon: (pmbus) Add support for MPS Multi-phase mp2975 controller")
Fixes: f9e5f289b6 ("hwmon: (pmbus) Add support for MPS Multi-phase mp2856/mp2857 controller")
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20260911-hwmon-max20826-support-v2-1-5e30cbd97d84@analog.com
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Nuno Sá 2026-09-11 14:53:37 +01:00 committed by Guenter Roeck
parent 3550d1dbbc
commit 06bd6794b5
1 changed files with 2 additions and 1 deletions
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3
drivers/hwmon/pmbus/pmbus.h
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@ -242,6 +242,7 @@ enum pmbus_regs {
/*
* OPERATION
*/
#define PB_OPERATION_CONTROL_V_SRC GENMASK(5, 4)
#define PB_OPERATION_CONTROL_ON BIT(7)
/*
@ -386,7 +387,7 @@ enum pmbus_sensor_classes {
};
#define PMBUS_PAGES 32 /* Per PMBus specification */
#define PMBUS_PHASES 10 /* Maximum number of phases per page */
#define PMBUS_PHASES 16 /* Maximum number of phases per page */
/* Functionality bit mask */
#define PMBUS_HAVE_VIN BIT(0)