linux-kernel - Re: [PATCH 8/8] iio: mma8452: add devicetree property to allow all pin wirings

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Date:	Sun, 19 Jul 2015 20:42:05 +0200
From:	Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
To:	Jonathan Cameron <jic23@...nel.org>,
	Martin Kepplinger <martink@...teo.de>, knaack.h@....de,
	lars@...afoo.de, pmeerw@...erw.net, mfuzzey@...keon.com,
	roberta.dobrescu@...il.com, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org
CC:	devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	christoph.muellner@...obroma-systems.com
Subject: Re: [PATCH 8/8] iio: mma8452: add devicetree property to allow all
 pin wirings

Am 2015-07-19 um 15:47 schrieb Jonathan Cameron:
> On 06/07/15 13:34, Martin Kepplinger wrote:
>> For the devices supported by the mma8452 driver, two interrupt pins are
>> available to route the interrupt signals to. By default INT1 is assumed.
>>
>> This adds a simple boolean DT property, for users to configure it for
>> INT2, if that is the wired interrupt pin for them.
>>
>> This is important for everyone to be able to use this driver, no matter
>> how their chip is wired.
>>
>> Since this doesn't change the default behaviour, it doesn't break anything
>> for existing users.
>>
>> Signed-off-by: Martin Kepplinger <martin.kepplinger@...obroma-systems.com>
>> Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
> The whole series looks good to me.  Just want those acks from Peter and / or
> Martin before I apply it.
> 
> Thanks,
> 
> Jonathan

Peter at least replied to the first version of these patches, so he
should be around. I suspect that holidays get in the way now.

While I'm at it: I'll be on holidays pretty much all of august. In
general I could maintain the driver and have more improvements planned
on top of this patchset. Maybe I'll include a maintainers file entry
with those (later this year).

And: It shouldn't apply cleanly at least on your fixes-togreg branch of
iio.git. I don't know if this is in -next but in case you don't want to
resolve the diff, please feel free to ask for a clean version of the
whole patchset against -next at any time.

thanks,

                  martin

>> ---
>>  Documentation/devicetree/bindings/iio/accel/mma8452.txt |  2 ++
>>  drivers/iio/accel/mma8452.c                             | 14 ++++++++------
>>  2 files changed, 10 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/accel/mma8452.txt b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
>> index 8d98e05..9bad1fc 100644
>> --- a/Documentation/devicetree/bindings/iio/accel/mma8452.txt
>> +++ b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
>> @@ -10,6 +10,7 @@ Optional properties:
>>  
>>    - interrupt-parent: should be the phandle for the interrupt controller
>>    - interrupts: interrupt mapping for GPIO IRQ
>> +  - use_int2: assume interrupt pin wired to INT2 instead of INT1
>>  
>>  Example:
>>  
>> @@ -18,4 +19,5 @@ Example:
>>  		reg = <0x1d>;
>>  		interrupt-parent = <&gpio1>;
>>  		interrupts = <5 0>;
>> +		use_int2;
>>  	};
>> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
>> index 2b8ed67..f8ba146 100644
>> --- a/drivers/iio/accel/mma8452.c
>> +++ b/drivers/iio/accel/mma8452.c
>> @@ -1105,12 +1105,14 @@ static int mma8452_probe(struct i2c_client *client,
>>  		int enabled_interrupts = MMA8452_INT_TRANS |
>>  					 MMA8452_INT_FF_MT;
>>  
>> -		/* Assume wired to INT1 pin */
>> -		ret = i2c_smbus_write_byte_data(client,
>> -						MMA8452_CTRL_REG5,
>> -						supported_interrupts);
>> -		if (ret < 0)
>> -			return ret;
>> +		/* Assume wired to INT1 pin, except "use_int2" is found in DT */
>> +		if (!of_property_read_bool(client->dev.of_node, "use_int2")) {
>> +			ret = i2c_smbus_write_byte_data(client,
>> +							MMA8452_CTRL_REG5,
>> +							supported_interrupts);
>> +			if (ret < 0)
>> +				return ret;
>> +		}
>>  
>>  		ret = i2c_smbus_write_byte_data(client,
>>  						MMA8452_CTRL_REG4,
>>
> 

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