linux-kernel - Re: [PATCH v3 18/47] mfd: twl4030-power: Register with kernel power-off handler

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Message-ID: <20141103175619.GP27425@saruman>
Date:	Mon, 3 Nov 2014 11:56:19 -0600
From:	Felipe Balbi <balbi@...com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Guenter Roeck <linux@...ck-us.net>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3 18/47] mfd: twl4030-power: Register with kernel
 power-off handler

Hi,

On Mon, Nov 03, 2014 at 05:54:27PM +0000, Lee Jones wrote:
> On Mon, 27 Oct 2014, Guenter Roeck wrote:
> 
> > Register with kernel power-off handler instead of setting pm_power_off
> > directly. Register with low priority to reflect that the original code
> > only sets pm_power_off if it was not already set.
> > 
> > Make twl4030_power_off static as it is only called from the twl4030-power
> > driver. Drop remove function as it is no longer needed.
> > 
> > Cc: Samuel Ortiz <sameo@...ux.intel.com>
> > Cc: Lee Jones <lee.jones@...aro.org>
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> > v3:
> > - Replace poweroff in all newly introduced variables and in text
> >   with power_off or power-off as appropriate
> > - Replace POWEROFF_PRIORITY_xxx with POWER_OFF_PRIORITY_xxx
> > v2:
> > - Use define to specify poweroff handler priority
> > - Use dev_warn instead of dev_err
> > - Use devm_register_power_off_handler
> > - Drop remove function as it is no longer needed.
> > 
> >  drivers/mfd/twl4030-power.c | 29 +++++++++++++++++++----------
> >  include/linux/i2c/twl.h     |  1 -
> >  2 files changed, 19 insertions(+), 11 deletions(-)
> 
> Acked-by: Lee Jones <lee.jones@...aro.org>

this was not sent to lakml or linux-omap. Care to resend ?

> > diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
> > index cf92a6d..e36eea9 100644
> > --- a/drivers/mfd/twl4030-power.c
> > +++ b/drivers/mfd/twl4030-power.c
> > @@ -25,9 +25,10 @@
> >   */
> >  
> >  #include <linux/module.h>
> > -#include <linux/pm.h>
> > +#include <linux/notifier.h>
> >  #include <linux/i2c/twl.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/pm.h>
> >  #include <linux/of.h>
> >  #include <linux/of_device.h>
> >  
> > @@ -611,7 +612,8 @@ 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 int twl4030_power_off(struct notifier_block *this, unsigned long unused1,
> > +			     void *unused2)
> >  {
> >  	int err;
> >  
> > @@ -619,8 +621,15 @@ void twl4030_power_off(void)
> >  			       TWL4030_PM_MASTER_P1_SW_EVENTS);
> >  	if (err)
> >  		pr_err("TWL4030 Unable to power off\n");
> > +
> > +	return NOTIFY_DONE;
> >  }
> >  
> > +static struct notifier_block twl4030_power_off_nb = {
> > +	.notifier_call = 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 +848,9 @@ 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 +867,11 @@ 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_nb);
> > +		if (ret)
> > +			dev_warn(&pdev->dev,
> > +				 "Failed to register power-off handler\n");
> >  	}
> >  
> >  relock:
> > @@ -870,11 +885,6 @@ relock:
> >  	return err;
> >  }
> >  
> > -static int twl4030_power_remove(struct platform_device *pdev)
> > -{
> > -	return 0;
> > -}
> > -
> >  static struct platform_driver twl4030_power_driver = {
> >  	.driver = {
> >  		.name	= "twl4030_power",
> > @@ -882,7 +892,6 @@ static struct platform_driver twl4030_power_driver = {
> >  		.of_match_table = of_match_ptr(twl4030_power_of_match),
> >  	},
> >  	.probe		= twl4030_power_probe,
> > -	.remove		= twl4030_power_remove,
> >  };
> >  
> >  module_platform_driver(twl4030_power_driver);
> > diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
> > index 8cfb50f..f8544f1 100644
> > --- a/include/linux/i2c/twl.h
> > +++ b/include/linux/i2c/twl.h
> > @@ -680,7 +680,6 @@ struct twl4030_power_data {
> >  };
> >  
> >  extern int twl4030_remove_script(u8 flags);
> > -extern void twl4030_power_off(void);
> >  
> >  struct twl4030_codec_data {
> >  	unsigned int digimic_delay; /* in ms */
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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-- 
balbi

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