ARM: dts: exynos: correct PMIC interrupt trigger level on Midas family

[ Upstream commit e52dcd6e70fab51f53292e53336ecb007bb60889 ]

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: 15dfdfad2d4a ("ARM: dts: Add basic dts for Exynos4412-based Trats 2 board")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201210212534.216197-5-krzk@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/arm/boot/dts/exynos4412-midas.dtsi b/arch/arm/boot/dts/exynos4412-midas.dtsi
index 79e6bd56f9adfdc71676460898fc069ead0b8664..fedb21377c66cee8c35f55907269e5194d92a2ae 100644 (file)
--- a/arch/arm/boot/dts/exynos4412-midas.dtsi
+++ b/arch/arm/boot/dts/exynos4412-midas.dtsi
@@ -588,7 +588,7 @@
        max77686: 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>;