linux-kernel - [PATCH 7/7] ARM: dts: dra72-evm: Fix spurious card insert/removal interrupt

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Date:	Thu, 30 Jul 2015 13:43:40 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<tony@...mide.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mmc@...r.kernel.org>
CC:	<bcousson@...libre.com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <nsekhar@...com>, <kishon@...com>
Subject: [PATCH 7/7] ARM: dts: dra72-evm: Fix spurious card insert/removal interrupt

ldo1_reg in addition to being connected to the io lines is also
connected to the card detect line. On card removal, omap_hsmmc
driver does a regulator_disable causing card detect line to be
pulled down. This raises a card insertion interrupt and once the
MMC core detects there is no card inserted, it does a
regulator disable which again raises a card insertion interrupt.
This happens in a loop causing infinite MMC interrupts.

Fix it by making ldo1_reg as always_on.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 arch/arm/boot/dts/dra72-evm.dts |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/dra72-evm.dts b/arch/arm/boot/dts/dra72-evm.dts
index c5d8e7d..45f11a0 100644
--- a/arch/arm/boot/dts/dra72-evm.dts
+++ b/arch/arm/boot/dts/dra72-evm.dts
@@ -295,6 +295,7 @@
 					regulator-name = "ldo1";
 					regulator-min-microvolt = <1800000>;
 					regulator-max-microvolt = <3300000>;
+					regulator-always-on;
 					regulator-boot-on;
 				};
 
-- 
1.7.9.5

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