linux-kernel - [PATCH 3.19.y-ckt 86/92] ARM: dts: am57xx-beagle-x15: Fix IRQ type for mcp7941x

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Message-Id: <1432654896-28478-87-git-send-email-kamal@canonical.com>
Date:	Tue, 26 May 2015 08:41:30 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Grygorii Strashko <Grygorii.Strashko@...aro.org>,
	Nishanth Menon <nm@...com>, Tony Lindgren <tony@...mide.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 86/92] ARM: dts: am57xx-beagle-x15: Fix IRQ type for mcp7941x

3.19.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Grygorii Strashko <Grygorii.Strashko@...aro.org>

commit e7a7357341664148cabf98a3ab50b5d449afca0b upstream.

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@...aro.org>
Signed-off-by: Nishanth Menon <nm@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/boot/dts/am57xx-beagle-x15.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/am57xx-beagle-x15.dts b/arch/arm/boot/dts/am57xx-beagle-x15.dts
index 49edbda..bcc2f95 100644
--- a/arch/arm/boot/dts/am57xx-beagle-x15.dts
+++ b/arch/arm/boot/dts/am57xx-beagle-x15.dts
@@ -336,7 +336,7 @@
 		compatible = "microchip,mcp7941x";
 		reg = <0x6f>;
 		interrupt-parent = <&gic>;
-		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>;
-- 
1.9.1

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