ARM: dts: ux500: configure the accelerometers open drain

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 at vger.kernel.org

Cc Jonathan Cameron <[email protected]>

Signed-off-by Linus Walleij <[email protected]>

---
ChangeLog v1->v2:
- Switch to using the drive-mode-open-drain; setting

---
 arch/arm/boot/dts/ste-href-tvk1281618.dtsi | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

arch/arm/boot/dts/ste-href-tvk1281618.dtsi +7 -5

index 55f9d0cc90f3..aec816c8ecb6 100644
@@ -93,14 +93,15 @@
 				/* 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 at 1e {
 				/*

@@ -118,14 +119,15 @@
 				/* 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 at 0f {
 				/* Magnetometer */

@@ -216,7 +218,7 @@
 					/* Accelerometer interrupt lines 1 & 2 */
 					tvk_cfg {
 						pins = "GPIO82_C1", "GPIO83_D3";
-						ste,config = <&gpio_in_pd>;
+						ste,config = <&gpio_in_pu>;
 					};
 				};
 			};