linux-kernel - [PATCH 5.12 151/677] ARM: dts: exynos: correct PMIC interrupt trigger level on P4 Note family

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Message-Id: <20210512144842.258550528@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:43:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 151/677] ARM: dts: exynos: correct PMIC interrupt trigger level on P4 Note family

From: Krzysztof Kozlowski <krzk@...nel.org>

[ Upstream commit fbe9c9bb2e929865500a0985735f81c0142accad ]

The Maxim PMIC datasheets describe the interrupt line as active low
with a requirement of acknowledge from the CPU.  Without specifying the
interrupt type in Devicetree, kernel might apply some fixed
configuration, not necessarily working for this hardware.

Additionally, the interrupt line is shared so using level sensitive
interrupt is here especially important to avoid races.

Fixes: f48b5050c301 ("ARM: dts: exynos: add Samsung's Exynos4412-based P4 Note boards")
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Link: https://lore.kernel.org/r/20201210212534.216197-7-krzk@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/boot/dts/exynos4412-p4note.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/exynos4412-p4note.dtsi b/arch/arm/boot/dts/exynos4412-p4note.dtsi
index 5fe371543cbb..9e750890edb8 100644
--- a/arch/arm/boot/dts/exynos4412-p4note.dtsi
+++ b/arch/arm/boot/dts/exynos4412-p4note.dtsi
@@ -322,7 +322,7 @@
 	max77686: pmic@9 {
 		compatible = "maxim,max77686";
 		interrupt-parent = <&gpx0>;
-		interrupts = <7 IRQ_TYPE_NONE>;
+		interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
 		pinctrl-0 = <&max77686_irq>;
 		pinctrl-names = "default";
 		reg = <0x09>;
-- 
2.30.2