Re: [PATCH 2/2] mfd: tps65219: Make poweroff handler conditional on system-power-controller

[Lee Jones <lee@kernel.org>]

On Tue, 10 Mar 2026, Akashdeep Kaur wrote:

> Currently, the TPS65219 driver unconditionally registers a poweroff
> handler. This causes issues on systems where a different component
> (such as TF-A firmware) should handle system poweroff instead.
> 
> Make the poweroff handler registration conditional based on the
> "system-power-controller" device tree property. This follows the
> standard kernel pattern where only the designated power controller
> registers for system poweroff operations.
> 
> On systems where the property is absent, the PMIC will not register
> a poweroff handler, allowing other poweroff mechanisms to function.
> 
> Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
> ---
>  drivers/mfd/tps65219.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mfd/tps65219.c b/drivers/mfd/tps65219.c
> index 7275dcdb7c44..beb816707d8f 100644
> --- a/drivers/mfd/tps65219.c
> +++ b/drivers/mfd/tps65219.c
> @@ -541,13 +541,19 @@ static int tps65219_probe(struct i2c_client *client)
>  		return ret;
>  	}
>  
> -	ret = devm_register_power_off_handler(tps->dev,
> -					      tps65219_power_off_handler,
> -					      tps);
> -	if (ret) {
> -		dev_err(tps->dev, "failed to register power-off handler: %d\n", ret);
> -		return ret;
> +	/*
> +	 * Only register PMIC power-off handler if system-power-controller
> +	 * property is present.
> +	 */
> +	if (of_device_is_system_power_controller(tps->dev->of_node)) {

The function name `of_device_is_system_power_controller()` is quite
self-descriptive. Is this comment really necessary? The code seems clear
enough without it.

> +		ret = devm_register_power_off_handler(tps->dev,
> +						      tps65219_power_off_handler,
> +						      tps);
> +		if (ret)
> +			return dev_err_probe(tps->dev, ret,
> +					"failed to register power-off handler\n");
>  	}
> +
>  	return 0;
>  }
>  
> -- 
> 2.34.1
> 

-- 
Lee Jones [李琼斯]