From d2a3e0931a8f3b95b910096d022ffd98adbd075c Mon Sep 17 00:00:00 2001 From: Martin Kepplinger Date: Thu, 15 Oct 2015 15:10:32 +0200 Subject: [PATCH] iio: mma8452: support either of the available interrupt pins 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 For the binding: Acked-by: Rob Herring Signed-off-by: Jonathan Cameron --- .../devicetree/bindings/iio/accel/mma8452.txt | 6 ++++++ 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 e3c37467d7da..3c10e8581144 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 1eccc2dcf14c..116a6e401a6a 100644 --- a/drivers/iio/accel/mma8452.c +++ b/drivers/iio/accel/mma8452.c @@ -29,6 +29,7 @@ #include #include #include +#include #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, -- 2.20.1