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regulator: fan53555: Add support for FAN53555BUC23X type

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FAN53555BUC23X has the ID 0 and REV 0xc, starts at 600mV and
increments in 12.5mV steps.

Per the datasheet, the FAN53555BUC23X (23 option) is grouped with
the 00 and 13 options for soft-start timing (t_SS = 300us typ.),
so the existing enable_time = 400 is reused here as well.

This variant is found on the ASUS Tinker Edge R (RK3399Pro) as the
supply regulator for both vdd_gpu and vdd_cpu_b. Verified across
the full GPU OPP table with the userspace devfreq governor.

Signed-off-by: Arash Golgol <arash.golgol@gmail.com>
Link: https://patch.msgid.link/20260812125054.19111-1-arash.golgol@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arash Golgol 2026-08-12 16:20:54 +03:30 committed by Mark Brown
parent 6ab838a01b
commit e739acbe05
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GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 0 deletions
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6
drivers/regulator/fan53555.c
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@ -114,6 +114,7 @@ enum {
enum {
FAN53555_CHIP_REV_00 = 0x3,
FAN53555_CHIP_REV_13 = 0xf,
FAN53555_CHIP_REV_23 = 0xc,
};
enum {
@ -306,6 +307,11 @@ static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
di->vsel_step = 10000;
di->enable_time = 400;
break;
case FAN53555_CHIP_REV_23:
di->vsel_min = 600000;
di->vsel_step = 12500;
di->enable_time = 400;
break;
default:
dev_err(di->dev,
"Chip ID %d with rev %d not supported!\n",