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Currently, during startup, the fan is set to its maximum RPM by default, which may not be suitable for all use cases. This patch introduces support for specifying a target RPM via the Device Tree property "target-rpm". Changes: - Added `target_rpm` field to `max6639_data` structure to store the target RPM for each fan channel. - Modified `max6639_probe_child_from_dt()` to read the `"target-rpm"` property from the Device Tree and set `target_rpm` accordingly. - Updated `max6639_init_client()` to use `target_rpm` to compute the initial PWM duty cycle instead of defaulting to full speed (120/120). Behavior: - If `"target-rpm"` is specified, the fan speed is set accordingly. - If `"target-rpm"` is not specified, the previous behavior (full speed at startup) is retained. This allows better control over fan speed during system initialization. Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com> Link: https://lore.kernel.org/r/20250404115646.2000563-1-you@example.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.