On Wed, Oct 14, 2015 at 11:52:29AM +0200, Martin Kepplinger 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 different interrupt sources to one of them. Since only their motion
> detection interrupt source is implemented as IIO events, users just use
> either one of the pins.
>
> 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@xxxxxxxxxxxxxxxxxxxxx>
> ---
> changelog:
> 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 | 7 +++++++
> drivers/iio/accel/mma8452.c | 22 ++++++++++++++++------
> 2 files changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iio/accel/mma8452.txt b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> index e3c3746..f06ed87 100644
> --- a/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> +++ b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
> @@ -7,13 +7,19 @@ 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. If only "INT2" is present, INT2 is
> + used; otherwise INT1.
The last sentence should go, as it's a description of the OS behaviour
rather than the hardware.
With that removed, the binding looks fine to me.
> +
> Example:
>
> mma8453fc@1d {
> @@ -21,4 +27,5 @@ 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..4d69c3d 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 +1131,22 @@ static int mma8452_probe(struct i2c_client *client,
> MMA8452_INT_FF_MT;
> int enabled_interrupts = MMA8452_INT_TRANS |
> MMA8452_INT_FF_MT;
> + int irq1, irq2;
>
> - /* Assume wired to INT1 pin */
> - ret = i2c_smbus_write_byte_data(client,
> - MMA8452_CTRL_REG5,
> - supported_interrupts);
> - if (ret < 0)
> - return ret;
> + irq1 = of_irq_get_byname(client->dev.of_node, "INT1");
> + irq2 = of_irq_get_byname(client->dev.of_node, "INT2");
> +
> + /* if INT2 is found, use it. Otherwise INT1 */
> + if (!(irq2 > 0 && irq1 < 0)) {
> + ret = i2c_smbus_write_byte_data(client,
> + MMA8452_CTRL_REG5,
> + supported_interrupts);
> + if (ret < 0)
> + return ret;
> + dev_info(&client->dev, "using interrupt line INT1\n");
> + } else {
> + dev_info(&client->dev, "using interrupt line INT2\n");
> + }
Is this correct? As far as I can see you request client->irq regardless
(and I assume that's just the first interrupt in the DT).
Does this work for both
interrupt-names = "IRQ2", "IRQ1";
interrupts = <2>, <1>;
or
interrupt-names = "IRQ1", "IRQ2";
interrupts = <1>, <2>;
?
You might need to override client->irq.
Thanks,
Mark.
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