dt-bindings: mma8452: Re-word 'interrupt-names' description

Current wording in the binding documentation doesn't make it 100%
clear that only one of "INT1" and "INT2" will ever be used by the
driver and that specifying both has no advantages. Re-word it to make
this aspect a bit more explicit.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: linux-iio@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 Documentation/devicetree/bindings/iio/accel/mma8452.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

On 22.10.19 05:56, Andrey Smirnov wrote:
> Current wording in the binding documentation doesn't make it 100%
> clear that only one of "INT1" and "INT2" will ever be used by the
> driver and that specifying both has no advantages. Re-word it to make
> this aspect a bit more explicit.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> Cc: Chris Healy <cphealy@gmail.com>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Cc: Hartmut Knaack <knaack.h@gmx.de>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
> Cc: linux-iio@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  Documentation/devicetree/bindings/iio/accel/mma8452.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/accel/mma8452.txt b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> index e132394375a1..b27b6bee9eb6 100644
> --- a/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> +++ b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> @@ -17,7 +17,7 @@ Optional properties:
>  
>    - interrupts: interrupt mapping for GPIO IRQ
>  
> -  - interrupt-names: should contain "INT1" and/or "INT2", the accelerometer's
> +  - interrupt-names: should contain "INT1" or "INT2", the accelerometer's
>  		     interrupt line in use.
>  
>    - vdd-supply: phandle to the regulator that provides vdd power to the accelerometer.
> 

Acked-by: Martin Kepplinger <martink@posteo.de>

thanks,

                           martin

On Tue, 22 Oct 2019 10:43:09 +0200
Martin Kepplinger <martink@posteo.de> wrote:

> On 22.10.19 05:56, Andrey Smirnov wrote:
> > Current wording in the binding documentation doesn't make it 100%
> > clear that only one of "INT1" and "INT2" will ever be used by the
> > driver and that specifying both has no advantages. Re-word it to make
> > this aspect a bit more explicit.

From a quick glance at the datasheet, it appears that the hardware
is capable of routing different interrupts to different pins, even
if the driver does not do so.

CTRL_REG5 has 6 different bits to set whether particular blocks have
their interrupt routed to INT1 or INT2, so it appears to be possible
to send some each way.
 
A binding is for the hardware not the driver, so if I'm right about this
the current text is correct and should be left alone.

Thanks,

Jonathan

> > 
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> > Cc: Chris Healy <cphealy@gmail.com>
> > Cc: Jonathan Cameron <jic23@kernel.org>
> > Cc: Hartmut Knaack <knaack.h@gmx.de>
> > Cc: Lars-Peter Clausen <lars@metafoo.de>
> > Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
> > Cc: linux-iio@vger.kernel.org
> > Cc: devicetree@vger.kernel.org
> > Cc: linux-kernel@vger.kernel.org
> > ---
> >  Documentation/devicetree/bindings/iio/accel/mma8452.txt | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/accel/mma8452.txt b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> > index e132394375a1..b27b6bee9eb6 100644
> > --- a/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> > +++ b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> > @@ -17,7 +17,7 @@ Optional properties:
> >  
> >    - interrupts: interrupt mapping for GPIO IRQ
> >  
> > -  - interrupt-names: should contain "INT1" and/or "INT2", the accelerometer's
> > +  - interrupt-names: should contain "INT1" or "INT2", the accelerometer's
> >  		     interrupt line in use.
> >  
> >    - vdd-supply: phandle to the regulator that provides vdd power to the accelerometer.
> >   
> 
> Acked-by: Martin Kepplinger <martink@posteo.de>
> 
> thanks,
> 
>                            martin
>

On 22.10.19 12:50, Jonathan Cameron wrote:
> On Tue, 22 Oct 2019 10:43:09 +0200
> Martin Kepplinger <martink@posteo.de> wrote:
> 
>> On 22.10.19 05:56, Andrey Smirnov wrote:
>>> Current wording in the binding documentation doesn't make it 100%
>>> clear that only one of "INT1" and "INT2" will ever be used by the
>>> driver and that specifying both has no advantages. Re-word it to make
>>> this aspect a bit more explicit.
> 
> From a quick glance at the datasheet, it appears that the hardware
> is capable of routing different interrupts to different pins, even
> if the driver does not do so.
> 
> CTRL_REG5 has 6 different bits to set whether particular blocks have
> their interrupt routed to INT1 or INT2, so it appears to be possible
> to send some each way.
>  
> A binding is for the hardware not the driver, so if I'm right about this
> the current text is correct and should be left alone.

right, please ignore my "acked-by". Thanks a lot for taking a look.

                            martin