Re: [PATCH 6/7] hwmon: adm1275: Support ROHM BD12790

From: Matti Vaittinen

Date: Wed Jun 17 2026 - 01:58:17 EST


On 16/06/2026 17:15, Guenter Roeck wrote:
On 6/15/26 23:44, Matti Vaittinen wrote:
From: Matti Vaittinen <mazziesaccount@xxxxxxxxx>

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@xxxxxxxxx>
Assisted-by: GitHub Copilot:claude-sonnet-4.6

---

// snip

-/* The BD12780 data sheets mark TSFILT bit as reserved. */
-#define BD12780_PMON_DEFCONFIG        (ADM1278_VOUT_EN | ADM1278_TEMP1_EN)
+/* The BD127x0 data sheets mark TSFILT bit as reserved. */
+#define BD127X0_PMON_DEFCONFIG        (ADM1278_VOUT_EN | ADM1278_TEMP1_EN)

Please don't use such placeholders. Just use BD12780_PMON_DEFCONFIG
for both chips, similar to how the defines for all other chips
are handled.

Ok, thanks.

Yours,
-- Matti

--
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

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