hwmon: (pmbus) Implement multi-phase support
Some PMBus chips support multiple phases, and report telemetry such
as input current, output current, or temperature for each phase.
Add support for such chips to the PMBus core.
Start with a maximum of 8 phases per page, and assume that supported
sensors per phase are similar for all pages. Only support per-phase
telemetry attributes, no limits or alarms.
As part of this patch, set the initial page variable to 0xff to ensure
that the page is updated when the first page command is issued. Also
only issue page commands if the chip supports more than one page.
Cc: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index 27c7ae0..18e06fc 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -362,6 +362,7 @@ enum pmbus_sensor_classes {
};
#define PMBUS_PAGES 32 /* Per PMBus specification */
+#define PMBUS_PHASES 8 /* Maximum number of phases per page */
/* Functionality bit mask */
#define PMBUS_HAVE_VIN BIT(0)
@@ -388,13 +389,15 @@ enum pmbus_sensor_classes {
#define PMBUS_HAVE_PWM34 BIT(21)
#define PMBUS_HAVE_SAMPLES BIT(22)
-#define PMBUS_PAGE_VIRTUAL BIT(31)
+#define PMBUS_PHASE_VIRTUAL BIT(30) /* Phases on this page are virtual */
+#define PMBUS_PAGE_VIRTUAL BIT(31) /* Page is virtual */
enum pmbus_data_format { linear = 0, direct, vid };
enum vrm_version { vr11 = 0, vr12, vr13, imvp9, amd625mv };
struct pmbus_driver_info {
int pages; /* Total number of pages */
+ u8 phases[PMBUS_PAGES]; /* Number of phases per page */
enum pmbus_data_format format[PSC_NUM_CLASSES];
enum vrm_version vrm_version[PMBUS_PAGES]; /* vrm version per page */
/*
@@ -406,6 +409,7 @@ struct pmbus_driver_info {
int R[PSC_NUM_CLASSES]; /* exponent */
u32 func[PMBUS_PAGES]; /* Functionality, per page */
+ u32 pfunc[PMBUS_PHASES];/* Functionality, per phase */
/*
* The following functions map manufacturing specific register values
* to PMBus standard register values. Specify only if mapping is