hwmon: (pmbus/isl68137) Add support for RAA229621

The RAA229621 is a digital dual output multiphase (X+Y <= 8) PWM controller
designed to be compliant with AMD SVI3 specifications, targeting VDDCR_CPU
and VDDCR_SOC rails.

Add support for it to the isl68137 driver.

Signed-off-by: Chiang Brian <chiang.brian@inventec.com>
Link: https://lore.kernel.org/r/20250605040134.4012199-3-chiang.brian@inventec.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: BrianChiang0425

drivers/hwmon/pmbus/isl68137.c

@@ -63,6 +63,7 @@ enum chips {
 	raa228228,
 	raa229001,
 	raa229004,
+	raa229621,
 };
 
 enum variants {
@@ -465,6 +466,7 @@ static const struct i2c_device_id raa_dmpvr_id[] = {
 	{"raa228228", raa_dmpvr2_2rail_nontc},
 	{"raa229001", raa_dmpvr2_2rail},
 	{"raa229004", raa_dmpvr2_2rail},
+	{"raa229621", raa_dmpvr2_2rail},
 	{}
 };
 
@@ -512,6 +514,7 @@ static const struct of_device_id isl68137_of_match[] = {
 	{ .compatible = "renesas,raa228228", .data = (void *)raa_dmpvr2_2rail_nontc },
 	{ .compatible = "renesas,raa229001", .data = (void *)raa_dmpvr2_2rail },
 	{ .compatible = "renesas,raa229004", .data = (void *)raa_dmpvr2_2rail },
+	{ .compatible = "renesas,raa229621", .data = (void *)raa_dmpvr2_2rail },
 	{ },
 };