linux-kernel - Re: [PATCH v5 18/48] mfd: twl4030-power: Register with kernel power-off handler

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Date:	Mon, 10 Nov 2014 09:46:00 +0100
From:	Pavel Machek <pavel@....cz>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, linux-omap@...r.kernel.org
Subject: Re: [PATCH v5 18/48] mfd: twl4030-power: Register with kernel
 power-off handler

Hi!

> @@ -611,7 +611,7 @@ twl4030_power_configure_resources(const struct twl4030_power_data *pdata)
>   * After a successful execution, TWL shuts down the power to the SoC
>   * and all peripherals connected to it.
>   */
> -void twl4030_power_off(void)
> +static void twl4030_power_off(struct power_off_handler_block *this)
>  {
>  	int err;
>  
> @@ -621,6 +621,11 @@ void twl4030_power_off(void)
>  		pr_err("TWL4030 Unable to power off\n");
>  }
>  
> +static struct power_off_handler_block twl4030_power_off_hb = {
> +	.handler = twl4030_power_off,
> +	.priority = POWER_OFF_PRIORITY_LOW,
> +};
> +
>  static bool twl4030_power_use_poweroff(const struct twl4030_power_data *pdata,
>  					struct device_node *node)
>  {
> @@ -839,7 +844,9 @@ static int twl4030_power_probe(struct platform_device *pdev)
>  	}
>  
>  	/* Board has to be wired properly to use this feature */
> -	if (twl4030_power_use_poweroff(pdata, node) && !pm_power_off) {
> +	if (twl4030_power_use_poweroff(pdata, node)) {
> +		int ret;
> +
>  		/* Default for SEQ_OFFSYNC is set, lets ensure this */
>  		err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
>  				      TWL4030_PM_MASTER_CFG_P123_TRANSITION);
> @@ -856,7 +863,11 @@ static int twl4030_power_probe(struct platform_device *pdev)
>  			}
>  		}
>  
> -		pm_power_off = twl4030_power_off;
> +		ret = devm_register_power_off_handler(&pdev->dev,
> +						      &twl4030_power_off_hb);
> +		if (ret)
> +			dev_warn(&pdev->dev,
> +				 "Failed to register power-off handler\n");
>  	}
>  

Could we get rid of the "struct power_off_handler_block" and guarantee
that register_power_off never fails (or print message from the
register_power_off...)? That way, your patch would be an cleanup.

You could then add priorities if they turn out to be really
neccessary, later...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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