hwmon: (pmbus/max16601) Determine and use number of populated phases

The MAX16601 can report the number of populated phases. Use this
information to only create sysfs attributes for populated phases.

Cc: Alex Qiu <xqiu@google.com>
Cc: Ugur Usug <Ugur.Usug@maximintegrated.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210125185327.93282-1-linux@roeck-us.net
Reviewed-by: Alex Qiu <xqiu@google.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 73 insertions, 112 deletions

diff --git a/Documentation/hwmon/max16601.rst b/Documentation/hwmon/max16601.rst
index 346e74674c517..4813af0cc39d5 100644
--- a/Documentation/hwmon/max16601.rst
+++ b/Documentation/hwmon/max16601.rst
@@ -45,115 +45,76 @@ Sysfs entries
 
 The following attributes are supported.
 
-======================= =======================================================
-in1_label		"vin1"
-in1_input		VCORE input voltage.
-in1_alarm		Input voltage alarm.
-
-in2_label		"vout1"
-in2_input		VCORE output voltage.
-in2_alarm		Output voltage alarm.
-
-curr1_label		"iin1"
-curr1_input		VCORE input current, derived from duty cycle and output
-			current.
-curr1_max		Maximum input current.
-curr1_max_alarm		Current high alarm.
-
-curr2_label		"iin1.0"
-curr2_input		VCORE phase 0 input current.
-
-curr3_label		"iin1.1"
-curr3_input		VCORE phase 1 input current.
-
-curr4_label		"iin1.2"
-curr4_input		VCORE phase 2 input current.
-
-curr5_label		"iin1.3"
-curr5_input		VCORE phase 3 input current.
-
-curr6_label		"iin1.4"
-curr6_input		VCORE phase 4 input current.
-
-curr7_label		"iin1.5"
-curr7_input		VCORE phase 5 input current.
-
-curr8_label		"iin1.6"
-curr8_input		VCORE phase 6 input current.
-
-curr9_label		"iin1.7"
-curr9_input		VCORE phase 7 input current.
-
-curr10_label		"iin2"
-curr10_input		VCORE input current, derived from sensor element.
-
-curr11_label		"iin3"
-curr11_input		VSA input current.
-
-curr12_label		"iout1"
-curr12_input		VCORE output current.
-curr12_crit		Critical output current.
-curr12_crit_alarm	Output current critical alarm.
-curr12_max		Maximum output current.
-curr12_max_alarm	Output current high alarm.
-
-curr13_label		"iout1.0"
-curr13_input		VCORE phase 0 output current.
-
-curr14_label		"iout1.1"
-curr14_input		VCORE phase 1 output current.
-
-curr15_label		"iout1.2"
-curr15_input		VCORE phase 2 output current.
-
-curr16_label		"iout1.3"
-curr16_input		VCORE phase 3 output current.
-
-curr17_label		"iout1.4"
-curr17_input		VCORE phase 4 output current.
-
-curr18_label		"iout1.5"
-curr18_input		VCORE phase 5 output current.
-
-curr19_label		"iout1.6"
-curr19_input		VCORE phase 6 output current.
-
-curr20_label		"iout1.7"
-curr20_input		VCORE phase 7 output current.
-
-curr21_label		"iout3"
-curr21_input		VSA output current.
-curr21_highest		Historical maximum VSA output current.
-curr21_reset_history	Write any value to reset curr21_highest.
-curr21_crit		Critical output current.
-curr21_crit_alarm	Output current critical alarm.
-curr21_max		Maximum output current.
-curr21_max_alarm	Output current high alarm.
-
-power1_label		"pin1"
-power1_input		Input power, derived from duty cycle and output current.
-power1_alarm		Input power alarm.
-
-power2_label		"pin2"
-power2_input		Input power, derived from input current sensor.
-
-power3_label		"pout"
-power3_input		Output power.
-
-temp1_input		VCORE temperature.
-temp1_crit		Critical high temperature.
-temp1_crit_alarm	Chip temperature critical high alarm.
-temp1_max		Maximum temperature.
-temp1_max_alarm		Chip temperature high alarm.
-
-temp2_input		TSENSE_0 temperature
-temp3_input		TSENSE_1 temperature
-temp4_input		TSENSE_2 temperature
-temp5_input		TSENSE_3 temperature
-
-temp6_input		VSA temperature.
-temp6_crit		Critical high temperature.
-temp6_crit_alarm	Chip temperature critical high alarm.
-temp6_max		Maximum temperature.
-temp6_max_alarm		Chip temperature high alarm.
-======================= =======================================================
+=============================== ===============================================
+in1_label			"vin1"
+in1_input			VCORE input voltage.
+in1_alarm			Input voltage alarm.
+
+in2_label			"vout1"
+in2_input			VCORE output voltage.
+in2_alarm			Output voltage alarm.
+
+curr1_label			"iin1"
+curr1_input			VCORE input current, derived from duty cycle
+				and output current.
+curr1_max			Maximum input current.
+curr1_max_alarm			Current high alarm.
+
+curr[P+2]_label			"iin1.P"
+curr[P+2]_input			VCORE phase P input current.
+
+curr[N+2]_label			"iin2"
+curr[N+2]_input			VCORE input current, derived from sensor
+				element.
+				'N' is the number of enabled/populated phases.
+
+curr[N+3]_label			"iin3"
+curr[N+3]_input			VSA input current.
+
+curr[N+4]_label			"iout1"
+curr[N+4]_input			VCORE output current.
+curr[N+4]_crit			Critical output current.
+curr[N+4]_crit_alarm		Output current critical alarm.
+curr[N+4]_max			Maximum output current.
+curr[N+4]_max_alarm		Output current high alarm.
+
+curr[N+P+5]_label		"iout1.P"
+curr[N+P+5]_input		VCORE phase P output current.
+
+curr[2*N+5]_label		"iout3"
+curr[2*N+5]_input		VSA output current.
+curr[2*N+5]_highest		Historical maximum VSA output current.
+curr[2*N+5]_reset_history	Write any value to reset curr21_highest.
+curr[2*N+5]_crit		Critical output current.
+curr[2*N+5]_crit_alarm		Output current critical alarm.
+curr[2*N+5]_max			Maximum output current.
+curr[2*N+5]_max_alarm		Output current high alarm.
+
+power1_label			"pin1"
+power1_input			Input power, derived from duty cycle and output
+				current.
+power1_alarm			Input power alarm.
+
+power2_label			"pin2"
+power2_input			Input power, derived from input current sensor.
+
+power3_label			"pout"
+power3_input			Output power.
+
+temp1_input			VCORE temperature.
+temp1_crit			Critical high temperature.
+temp1_crit_alarm		Chip temperature critical high alarm.
+temp1_max			Maximum temperature.
+temp1_max_alarm			Chip temperature high alarm.
+
+temp2_input			TSENSE_0 temperature
+temp3_input			TSENSE_1 temperature
+temp4_input			TSENSE_2 temperature
+temp5_input			TSENSE_3 temperature
+
+temp6_input			VSA temperature.
+temp6_crit			Critical high temperature.
+temp6_crit_alarm		Chip temperature critical high alarm.
+temp6_max			Maximum temperature.
+temp6_max_alarm			Chip temperature high alarm.
+=============================== ===============================================