linux-kernel - [PATCH 2/2] ARM: dts: Change WDOG_ANY signal from push-pull to open-drain

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Message-ID: <20200528144312.25980-2-frieder.schrempf@kontron.de>
Date:   Thu, 28 May 2020 14:43:43 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Fabio Estevam <festevam@...il.com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "NXP Linux Team" <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 2/2] ARM: dts: Change WDOG_ANY signal from push-pull to
 open-drain

From: Frieder Schrempf <frieder.schrempf@...tron.de>

The WDOG_ANY signal is connected to the RESET_IN signal of the SoM
and baseboard. It is currently configured as push-pull, which means
that if some external device like a programmer wants to assert the
RESET_IN signal by pulling it to ground, it drives against the high
level WDOG_ANY output of the SoC.

To fix this we set the WDOG_ANY signal to open-drain configuration.
That way we make sure that the RESET_IN can be asserted by the
watchdog as well as by external devices.

Fixes: 1ea4b76cdfde ("ARM: dts: imx6ul-kontron-n6310: Add Kontron i.MX6UL N6310 SoM and boards")
Cc: stable@...r.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
 arch/arm/boot/dts/imx6ul-kontron-n6x1x-som-common.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6ul-kontron-n6x1x-som-common.dtsi b/arch/arm/boot/dts/imx6ul-kontron-n6x1x-som-common.dtsi
index fc316408721d..61ba21a605a8 100644
--- a/arch/arm/boot/dts/imx6ul-kontron-n6x1x-som-common.dtsi
+++ b/arch/arm/boot/dts/imx6ul-kontron-n6x1x-som-common.dtsi
@@ -116,7 +116,7 @@
 
 	pinctrl_wdog: wdoggrp {
 		fsl,pins = <
-			MX6UL_PAD_GPIO1_IO09__WDOG1_WDOG_ANY    0x30b0
+			MX6UL_PAD_GPIO1_IO09__WDOG1_WDOG_ANY    0x18b0
 		>;
 	};
 };
-- 
2.17.1