power: supply: Introduces bypass charging property

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071846
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
 support in the kernel for NXP i.MX8 platforms.  This set updates the
 power subsystem.  This set has been tested via simple boot tests and
 the CI loop.

commit 05f2281
Author: Ricardo Rivera-Matos <rriveram@opensource.cirrus.com>
Date:   Mon Feb 14 18:07:56 2022 -0600

    power: supply: Introduces bypass charging property

    Adds a POWER_SUPPLY_CHARGE_TYPE_BYPASS option to the POWER_SUPPLY_PROP_CHARGE_TYPE
    property to facilitate bypass charging operation.

    In bypass charging operation, the charger bypasses the charging path around the
    integrated converter allowing for a "smart" wall adaptor to perform the power
    conversion externally.

    This operational mode is critical for the USB PPS standard of power adaptors and is
    becoming a common feature in modern charging ICs such as:

    - BQ25980
    - BQ25975
    - BQ25960
    - LN8000
    - LN8410

    Signed-off-by: Ricardo Rivera-Matos <rriveram@opensource.cirrus.com>
    Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
    (cherry picked from commit 05f2281)

Signed-off-by: Al Stone <ahs3@redhat.com>

Author: Al Stone

Documentation/ABI/testing/sysfs-class-power

@@ -380,13 +380,16 @@ Description:
 		algorithm to adjust the charge rate dynamically, without
 		any user configuration required. "Custom" means that the charger
 		uses the charge_control_* properties as configuration for some
-		different algorithm.
+		different algorithm. "Bypass" means the charger bypasses the
+		charging path around the integrated converter allowing for a
+		"smart" wall adaptor to perform the power conversion
+		externally.
 
 		Access: Read, Write
 
 		Valid values:
 			      "Unknown", "N/A", "Trickle", "Fast", "Standard",
-			      "Adaptive", "Custom"
+			      "Adaptive", "Custom", "Bypass"
 
 What:		/sys/class/power_supply/<supply_name>/charge_term_current
 Date:		July 2014

drivers/power/supply/power_supply_sysfs.c

@@ -89,6 +89,7 @@ static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = {
 	[POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE]	= "Adaptive",
 	[POWER_SUPPLY_CHARGE_TYPE_CUSTOM]	= "Custom",
 	[POWER_SUPPLY_CHARGE_TYPE_LONGLIFE]	= "Long Life",
+	[POWER_SUPPLY_CHARGE_TYPE_BYPASS]	= "Bypass",
 };
 
 static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {

include/linux/power_supply.h

@@ -49,6 +49,7 @@ enum {
 	POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE,	/* dynamically adjusted speed */
 	POWER_SUPPLY_CHARGE_TYPE_CUSTOM,	/* use CHARGE_CONTROL_* props */
 	POWER_SUPPLY_CHARGE_TYPE_LONGLIFE,	/* slow speed, longer life */
+	POWER_SUPPLY_CHARGE_TYPE_BYPASS,	/* bypassing the charger */
 };
 
 enum {