From: Guenter Roeck <linux@roeck-us.net>
To: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>
Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH 4/6] hwmon: (pmbus/max20830): add VOUT feedback resistor scaling support
Date: Mon, 29 Jun 2026 21:53:47 -0700 [thread overview]
Message-ID: <d306dab2-efcb-4626-b480-c4e8779cdeed@roeck-us.net> (raw)
In-Reply-To: <20260630-dev-max20830c-v1-4-a02786bde470@analog.com>
On 6/29/26 19:46, Alexis Czezar Torreno wrote:
> Implement support for external voltage divider scaling using the
> adi,vout-rfb1-ohms and adi,vout-rfb2-ohms device tree properties.
>
> When the desired output voltage exceeds VREF, a resistor divider
> (RFB1 and RFB2) is used to scale down the feedback voltage. The
> driver reads these resistor values from device tree and applies
> the scaling formula: VOUT_actual = VOUT_measured × (1 + RFB1/RFB2)
>
> The properties are optional. If not specified, the driver assumes
> no voltage divider is present and reports the raw VOUT reading.
>
This will require a detailed explanation why only PMBUS_READ_VOUT
would require scaling but not any of the other vout related commands.
Guenter
next prev parent reply other threads:[~2026-06-30 4:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-30 2:46 [PATCH 0/6] Add support for MAX20830C and MAX20840C step-down DC-DC switching regulator Alexis Czezar Torreno
2026-06-30 2:46 ` [PATCH 1/6] dt-bindings: hwmon: (pmbus/max20830): add enable-gpios property Alexis Czezar Torreno
2026-06-30 7:26 ` Krzysztof Kozlowski
2026-06-30 8:07 ` Torreno, Alexis Czezar
2026-06-30 15:48 ` Guenter Roeck
2026-07-01 1:16 ` Torreno, Alexis Czezar
2026-06-30 2:46 ` [PATCH 2/6] hwmon: (pmbus/max20830): add support for enable GPIO Alexis Czezar Torreno
2026-06-30 3:50 ` Guenter Roeck
2026-06-30 4:51 ` Guenter Roeck
2026-06-30 8:07 ` Torreno, Alexis Czezar
2026-06-30 2:46 ` [PATCH 3/6] dt-bindings: hwmon: (pmbus/max20830): add VOUT feedback resistor properties Alexis Czezar Torreno
2026-06-30 7:39 ` Krzysztof Kozlowski
2026-06-30 2:46 ` [PATCH 4/6] hwmon: (pmbus/max20830): add VOUT feedback resistor scaling support Alexis Czezar Torreno
2026-06-30 4:53 ` Guenter Roeck [this message]
2026-06-30 8:07 ` Torreno, Alexis Czezar
2026-06-30 15:34 ` Guenter Roeck
2026-07-01 1:16 ` Torreno, Alexis Czezar
2026-06-30 2:46 ` [PATCH 5/6] dt-bindings: hwmon: (pmbus/max20830): add max20830c and max20840c support Alexis Czezar Torreno
2026-06-30 7:41 ` Krzysztof Kozlowski
2026-06-30 8:07 ` Torreno, Alexis Czezar
2026-06-30 15:06 ` Guenter Roeck
2026-06-30 2:46 ` [PATCH 6/6] hwmon: (pmbus/max20830): add support for max20830c and max20840c Alexis Czezar Torreno
2026-06-30 3:43 ` Guenter Roeck
2026-06-30 8:07 ` Torreno, Alexis Czezar
2026-06-30 15:04 ` Guenter Roeck
2026-07-02 2:50 ` Torreno, Alexis Czezar
2026-07-02 4:43 ` Guenter Roeck
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