linux-kernel - Re: [PATCHv5 8/8] mfd: as3722: Rid driver of superfluous I2C device ID structure

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Date:	Tue, 10 May 2016 08:33:46 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	Kieran Bingham <kieran@...uared.org.uk>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, grant.likely@...aro.org,
	sameo@...ux.intel.com
Subject: Re: [PATCHv5 8/8] mfd: as3722: Rid driver of superfluous I2C device
 ID structure

On Tue, 10 May 2016, Javier Martinez Canillas wrote:

> On 05/04/2016 11:14 AM, Kieran Bingham wrote:
> > From: Lee Jones <lee.jones@...aro.org>
> > 
> > Also remove unused second probe() parameter 'i2c_device_id'.
> >
> > Acked-by: Grant Likely <grant.likely@...aro.org>
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > Signed-off-by: Kieran Bingham <kieran@...gham.xyz>
> > 
> > ---
> > Changes since v4
> >  - Rename .probe2 to probe_new
> > ---
> >  drivers/mfd/as3722.c | 12 ++----------
> >  1 file changed, 2 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/mfd/as3722.c b/drivers/mfd/as3722.c
> > index e1f597f97f86..28fc62af6861 100644
> > --- a/drivers/mfd/as3722.c
> > +++ b/drivers/mfd/as3722.c
> > @@ -354,8 +354,7 @@ static int as3722_i2c_of_probe(struct i2c_client *i2c,
> >  	return 0;
> >  }
> >  
> > -static int as3722_i2c_probe(struct i2c_client *i2c,
> > -			const struct i2c_device_id *id)
> > +static int as3722_i2c_probe(struct i2c_client *i2c)
> >  {
> >  	struct as3722 *as3722;
> >  	unsigned long irq_flags;
> > @@ -453,12 +452,6 @@ static const struct of_device_id as3722_of_match[] = {
> >  };
> >  MODULE_DEVICE_TABLE(of, as3722_of_match);
> >  
> > -static const struct i2c_device_id as3722_i2c_id[] = {
> > -	{ "as3722", 0 },
> > -	{},
> > -};
> > -MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
> > -
> 
> Just a note that this can only be made because the driver's Kconfig symbol
> is bool and not tristate. Since for drivers that can be built as a module,
> the I2C core always reports a MODALIAS of the form "i2c:as3722" and so the
> i2c_device_id array and the MODULE_DEVICE_TABLE() are needed even when not
> used by the driver.
> 
> As mentioned the change is correct for this driver but I just wanted to
> point out in case other authors try to do the same change for drivers that
> can be built as a module and so breaking module auto-loading.

Sounds like a subsequent patch might be required to fix that use-case
too.  I'll add it to my TODO. :)

> Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> Best regards,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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