From: Grygorii Strashko Date: Wed, 8 Apr 2015 23:56:26 +0000 (-0500) Subject: ARM: dts: am57xx-beagle-x15: Fix IRQ type for mcp7941x X-Git-Tag: firefly_0821_release~176^2~1669^2^2~18 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e7a7357341664148cabf98a3ab50b5d449afca0b;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Nishanth Menon Signed-off-by: Tony Lindgren --- 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 = ; /* IRQ_SYS_1N */ + interrupts = ; /* IRQ_SYS_1N */ pinctrl-names = "default"; pinctrl-0 = <&mcp79410_pins_default>;