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authorGrygorii Strashko <Grygorii.Strashko@linaro.org>2015-04-08 18:56:26 -0500
committerTony Lindgren <tony@atomide.com>2015-05-04 09:21:02 -0700
commite7a7357341664148cabf98a3ab50b5d449afca0b (patch)
tree657fe9711b25692ea0bd8e67b69db8623859f66c /arch
parent2055088b5e17b450fcfb536568aee00eccd0ced5 (diff)
downloadlinux-linaro-stable-e7a7357341664148cabf98a3ab50b5d449afca0b.tar.gz
ARM: dts: am57xx-beagle-x15: Fix IRQ type for mcp7941x
The interrupt polarity provided in devicetree is used to configure the interrupt controller(ARM GIC), however, it seems that we have an inverter at the GIC boundary inside AM57xx which inverts the signal input from sys_irq external interrupt source. Further, as per GIC distributor TRM, http://infocenter.arm.com/help/topic/com.arm.doc.ddi0438d/BGBHIACJ.html#BABJFCFB ARM GIC distributor does not support IRQ trigger type IRQ_TYPE_LEVEL_LOW, and only rising or level high signals. However, for some reason, the current configuration(which gets ignored by GIC driver) functions on some platforms, however, on few platforms results in infinite interrupts hogging the system down. Switch over to rising edge for GIC configuration which is also aligned with trigger point from the RTC chip and the internal inversion. Fixes: 5a0f93c6576a ("ARM: dts: Add am57xx-beagle-x15") Signed-off-by: Grygorii Strashko <Grygorii.Strashko@linaro.org> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/boot/dts/am57xx-beagle-x15.dts2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/am57xx-beagle-x15.dts b/arch/arm/boot/dts/am57xx-beagle-x15.dts
index 15f198e4864d..7ac6ee2c52d8 100644
--- a/arch/arm/boot/dts/am57xx-beagle-x15.dts
+++ b/arch/arm/boot/dts/am57xx-beagle-x15.dts
@@ -455,7 +455,7 @@
mcp_rtc: rtc@6f {
compatible = "microchip,mcp7941x";
reg = <0x6f>;
- interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_LOW>; /* IRQ_SYS_1N */
+ interrupts = <GIC_SPI 2 IRQ_TYPE_EDGE_RISING>; /* IRQ_SYS_1N */
pinctrl-names = "default";
pinctrl-0 = <&mcp79410_pins_default>;