Re: [PATCH v4] iio: mma8452: support either of the available interrupt pins

[Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On 22/10/15 19:22, Rob Herring wrote:
> On Thu, Oct 15, 2015 at 8:10 AM, Martin Kepplinger <martink-1KBjaw7Xf1+zQB+pC5nmwQ@public.gmane.org> wrote:
>> This change is important in order for everyone to be easily able to use the
>> driver for one of the supported accelerometer chips!
>>
>> Until now, the driver blindly assumed that the INT1 interrupt line is wired
>> on a user's board. But these devices have 2 interrupt lines and can route
>> their interrupt sources to one of them. Now, if "INT2" is found and matches
>> i2c_client->irq, INT2 will be used.
>>
>> The chip's default actually is INT2, which is why probably many boards will
>> have it wired and can make use of this.
>>
>> Of course, this also falls back to assuming INT1, so for existing users
>> nothing will break. The new functionality is described in the bindings doc.
>>
>> Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
>> ---
>> changelog:
>> v4: use irq that matches client->irq, backwards compatible
>> v3: correctly assign irq if both pins are described in DT
>> v2: don't warn but normally handle if both pins are described in dts
>>     thanks Mark Rutland
>> v1: initial post
>>
>>  .../devicetree/bindings/iio/accel/mma8452.txt       |  6 ++++++
> 
> For the binding:
> 
> Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
I've guessed that was an Acked-by :)

Anyhow, applied to the togreg branch of iio.git.

I'm afraid after my hiatus for a couple of weeks (day job work crisis now
over) this has missed going in for the current cycle.

IIO merge closes more than a week before the merge window opens and Linus
just announced probably release a week today.

Sorry about that, will be queued up for an early entry into linux next
after the merge window closes.

Jonathan
> 
>>  drivers/iio/accel/mma8452.c                         | 21 +++++++++++++++------
>>  2 files changed, 21 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/accel/mma8452.txt b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
>> index e3c3746..3c10e85 100644
>> --- a/Documentation/devicetree/bindings/iio/accel/mma8452.txt
>> +++ b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
>> @@ -7,13 +7,18 @@ Required properties:
>>      * "fsl,mma8453"
>>      * "fsl,mma8652"
>>      * "fsl,mma8653"
>> +
>>    - reg: the I2C address of the chip
>>
>>  Optional properties:
>>
>>    - interrupt-parent: should be the phandle for the interrupt controller
>> +
>>    - interrupts: interrupt mapping for GPIO IRQ
>>
>> +  - interrupt-names: should contain "INT1" and/or "INT2", the accelerometer's
>> +                    interrupt line in use.
>> +
>>  Example:
>>
>>         mma8453fc@1d {
>> @@ -21,4 +26,5 @@ Example:
>>                 reg = <0x1d>;
>>                 interrupt-parent = <&gpio1>;
>>                 interrupts = <5 0>;
>> +               interrupt-names = "INT2";
>>         };
>> diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
>> index 1eccc2d..116a6e4 100644
>> --- a/drivers/iio/accel/mma8452.c
>> +++ b/drivers/iio/accel/mma8452.c
>> @@ -29,6 +29,7 @@
>>  #include <linux/iio/events.h>
>>  #include <linux/delay.h>
>>  #include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>>
>>  #define MMA8452_STATUS                         0x00
>>  #define  MMA8452_STATUS_DRDY                   (BIT(2) | BIT(1) | BIT(0))
>> @@ -1130,13 +1131,21 @@ static int mma8452_probe(struct i2c_client *client,
>>                                            MMA8452_INT_FF_MT;
>>                 int enabled_interrupts = MMA8452_INT_TRANS |
>>                                          MMA8452_INT_FF_MT;
>> +               int irq2;
>>
>> -               /* Assume wired to INT1 pin */
>> -               ret = i2c_smbus_write_byte_data(client,
>> -                                               MMA8452_CTRL_REG5,
>> -                                               supported_interrupts);
>> -               if (ret < 0)
>> -                       return ret;
>> +               irq2 = of_irq_get_byname(client->dev.of_node, "INT2");
>> +
>> +               if (irq2 == client->irq) {
>> +                       dev_dbg(&client->dev, "using interrupt line INT2\n");
>> +               } else {
>> +                       ret = i2c_smbus_write_byte_data(client,
>> +                                                       MMA8452_CTRL_REG5,
>> +                                                       supported_interrupts);
>> +                       if (ret < 0)
>> +                               return ret;
>> +
>> +                       dev_dbg(&client->dev, "using interrupt line INT1\n");
>> +               }
>>
>>                 ret = i2c_smbus_write_byte_data(client,
>>                                                 MMA8452_CTRL_REG4,
>> --
>> 2.1.4
>>
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