Re: [hwmon-next PATCH v6 3/4] hwmon: (adt7470) Expose fan control via PWM framework

> The ADT7470 features four PWM outputs designed to control fans.
> Previously, these were only accessible through the legacy hwmon
> sysfs interface.
> 
> Expose the ADT7470 fan control lines through the generic PWM framework.
> This allows generic PWM consumers described in Device Tree, such as
> "pwm-fan", to use the device through the "#pwm-cells" property.  This is
> particularly necessary for boards where the ADT7470 external temperature
> sensors are not populated and the chip is used strictly as a fan
> controller (e.g., Edgecore ECS-2100-52T switches). In such setups,
> delegating control to the generic PWM subsystem allows the kernel's
> thermal framework to manage the fans based on unrelated temperature
> zones, such as internal SoC sensors.
> 
> When a PWM consumer applies a new PWM state, the driver automatically
> switches the corresponding PWM channel to manual mode so that the
> requested duty cycle takes effect. The duty cycle specified by the PWM
> framework is internally converted to the 0-255 scale expected by the
> hardware registers.
> 
> To prevent conflicting access, the hwmon PWM sysfs attributes are hidden
> when the device is registered with PWM framework support (i.e. when
> "#pwm-cells" is present in DT and CONFIG_PWM is reachable).
> 
> Signed-off-by: Luiz Angelo Daros de Luca <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/[email protected]?part=3