hwmon: (pmbus/adm1275) Support ROHM BD12790

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Add support for ROHM BD12790 hot-swap controller which is largely
similar to Analog Devices adm1272.

The BD12790 uses the same selectable 60V/100V voltage ranges and
15mV/30mV current-sense ranges as the ADM1272, and the same VRANGE
(bit 5) and IRANGE (bit 0) layout in PMON_CONFIG. It therefore uses
a dedicated coefficient table that mirrors adm1272_coefficients, with
the following differences derived from BD12790 datasheet Table 1 (p.18):
- power 60V/30mV: m=17560 (vs. 17561)
- power 100V/30mV: m=10536 (vs. 10535)
- temperature: b=31880 (vs. 31871, reflecting T[11:0] = 4.2*T + 3188)

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Assisted-by: GitHub Copilot:claude-sonnet-4.6
Link: https://lore.kernel.org/r/b209c1b47712b69f17b52cfd7a7a38ed76024ca7.1782458224.git.mazziesaccount@gmail.com
[groeck: Fixed comment describing BD12790 coefficients]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

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This commit is contained in:

Matti Vaittinen 2026-06-26 10:26:02 +03:00 • committed by Guenter Roeck

parent b66f500d62

commit 73a76fa6e8

2 changed files with 78 additions and 5 deletions

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4

drivers/hwmon/pmbus/Kconfig

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79

drivers/hwmon/pmbus/adm1275.c

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