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ARM: dts: ux500: configure the accelerometers open drain

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Configure the two accelerometers sharing GPIO line 82 as:

- Open drain so that they can share the same interrupt line.

Configure the corresponding interrupt pin:

- Trigger on the falling edge since open drain implies that we
  do not actively drive the line high, but we will actively drive
  it low to generate interrupts and then it moves from high to low
  i.e. a falling edge.

- Pulled up so the line will be biased to high unless an IRQ
  is active on any device on the line, and thus it goes high
  again after the interrupt is deasserted.

Cc: linux-iio@vger.kernel.org
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-02-05 14:00:00 +01:00
parent 0bfe5167b2
commit 7ba5dd5300
1 changed files with 7 additions and 5 deletions
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12
arch/arm/boot/dts/ste-href-tvk1281618.dtsi
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@ -93,14 +93,15 @@ lsm303dlh@18 {
/* Accelerometer */
compatible = "st,lsm303dlh-accel";
st,drdy-int-pin = <1>;
drive-open-drain;
reg = <0x18>;
vdd-supply = <&ab8500_ldo_aux1_reg>;
vddio-supply = <&db8500_vsmps2_reg>;
pinctrl-names = "default";
pinctrl-0 = <&accel_tvk_mode>;
interrupt-parent = <&gpio2>;
interrupts = <18 IRQ_TYPE_EDGE_RISING>,
<19 IRQ_TYPE_EDGE_RISING>;
interrupts = <18 IRQ_TYPE_EDGE_FALLING>,
<19 IRQ_TYPE_EDGE_FALLING>;
};
lsm303dlh@1e {
/*
@ -118,14 +119,15 @@ lis331dl@1c {
/* Accelerometer */
compatible = "st,lis331dl-accel";
st,drdy-int-pin = <1>;
drive-open-drain;
reg = <0x1c>;
vdd-supply = <&ab8500_ldo_aux1_reg>;
vddio-supply = <&db8500_vsmps2_reg>;
pinctrl-names = "default";
pinctrl-0 = <&accel_tvk_mode>;
interrupt-parent = <&gpio2>;
interrupts = <18 IRQ_TYPE_EDGE_RISING>,
<19 IRQ_TYPE_EDGE_RISING>;
interrupts = <18 IRQ_TYPE_EDGE_FALLING>,
<19 IRQ_TYPE_EDGE_FALLING>;
};
ak8974@0f {
/* Magnetometer */
@ -216,7 +218,7 @@ accel_tvk_mode: accel_tvk {
/* Accelerometer interrupt lines 1 & 2 */
tvk_cfg {
pins = "GPIO82_C1", "GPIO83_D3";
ste,config = <&gpio_in_pd>;
ste,config = <&gpio_in_pu>;
};
};
};