Re: [PATCH v3 1/2] dt-bindings: trivial-devices: Add Murata D1U74T PSU

[Abdurrahman Hussain]

On Thu May 14, 2026 at 4:43 AM PDT, Krzysztof Kozlowski wrote:
> On Wed, May 13, 2026 at 03:33:02AM -0700, Abdurrahman Hussain wrote:
>> The Murata D1U74T-W is a PMBus-compliant AC/DC power supply unit. The
>> binding only declares the compatible string and i2c reg, with no
>
> Describe the hardware, not binding. What does the hardware have?
> Supplies? Pins? Clocks? Interrupts?
>

Hi Krzysztof,

The Murata D1U74T-W series are hot-pluggable 1U AC/DC front-end
power supplies in the Intel CRPS-185 / OCP M-CRPS form factor.
Each variant delivers a 12 V main output plus a 12 V standby output
from a wide AC input (90-264 Vac) or HVDC supply, and includes an
internal variable-speed cooling fan and on-board voltage, current,
power, fan-speed, and temperature telemetry.

The host-side digital interface is a PMBus 1.2 port on I2C.  The
PSU's other electrical signals (status, alert, current-share) live
on the CRPS edge connector and are consumed by the chassis
controller rather than the host SoC, so there are no host-described
supplies, gpios, clocks, or interrupts.

If the above two paragraphs provide the adequate description of the
hardware I will include them verbatim in v4.

Best regards,
Abdurrahman