linux-kernel - [PATCH v2 3/3] ARM: dts: imx6: phycore: Rely on PMIC reboot/reset handler

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Message-Id: <20230719114328.2239818-3-andrej.picej@norik.com>
Date:   Wed, 19 Jul 2023 13:43:28 +0200
From:   Andrej Picej <andrej.picej@...ik.com>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, S.Riedmueller@...tec.de,
        S.Mueller-Klieser@...tec.de, upstream@...tec.de
Subject: [PATCH v2 3/3] ARM: dts: imx6: phycore: Rely on PMIC reboot/reset handler

Due to the missing signal connection between i.MX6 WDOG_B pin and the
PMICs external reset, the internal i.MX6 watchdog is not able to reset
the phyCORE i.MX6 SoM properly. Thus disable the internal i.MX6 watchdog
to prevent unexpected PMIC settings after reset.

NOTE: This patch should not be backported as it might break existing
uses and fixes in bootloaders.

Signed-off-by: Andrej Picej <andrej.picej@...ik.com>
---
Changes in v2:
 - new patch
 - i.MX6 phyCOREs have the same problem as phyFLEX devices.
---
 arch/arm/boot/dts/nxp/imx/imx6qdl-phytec-phycore-som.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx6qdl-phytec-phycore-som.dtsi b/arch/arm/boot/dts/nxp/imx/imx6qdl-phytec-phycore-som.dtsi
index 28a805384668..86b4269e0e01 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6qdl-phytec-phycore-som.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx6qdl-phytec-phycore-som.dtsi
@@ -309,3 +309,11 @@ MX6QDL_PAD_SD4_DAT7__SD4_DATA7		0x17059
 		>;
 	};
 };
+
+&wdog1 {
+	/*
+	 * Rely on PMIC reboot handler. Internal i.MX6 watchdog, that is also
+	 * used for reboot, does not reset all external PMIC voltages on reset.
+	 */
+	status = "disabled";
+};
-- 
2.25.1