From mboxrd@z Thu Jan 1 00:00:00 1970 From: tharvey@gateworks.com (Tim Harvey) Date: Thu, 4 Jun 2015 13:15:58 -0700 Subject: [PATCH v2 0/2] imx6: Implement external watchdog reset In-Reply-To: <1432853677-5150-1-git-send-email-tharvey@gateworks.com> References: <1432853677-5150-1-git-send-email-tharvey@gateworks.com> Message-ID: <1433448960-9257-1-git-send-email-tharvey@gateworks.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The IMX6 watchdog supports assertion of a signal (WDOG_B) which can be pinmux'd to an external pin. This is typically used for boards that have PMIC's in control of the IMX6 power rails. In fact, failure to use such an external reset on boards with external PMIC's can result in various hangs due to the IMX6 not being fully reset [1] as well as the board failing to reset because its PMIC has not been reset to provide adequate voltate for the CPU when comming out of reset at 800Mhz when it was at 400Mhz prior to reset. This adds a new device-tree property 'ext-reset-output' to fsl-imx-wdt in order to indicate the board has such a reset and to cause the watchdog to be configured to assert WDOG_B instead of an internal reset both on a watchdog timeout and in system_restart. The second patch adds the watchdog configuration and pinmux for Gateworks Ventana boards. I would expect that maintainers of other IMX6 boards that use PMIC's that are resettable via WDOG_B to follow-up with similar device-tree patches. I've attempted to Cc those individuals here. [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/333689.html Cc: Fabio Estevam Cc: Lucas Stach Cc: Stefan Roese Cc: Iain Paton Cc: Sascha Hauer Tim Harvey (2): watchdog: imx2_wdt: add external reset support via 'ext-reset-output' dt prop ARM: dts: ventana: Add ext-reset support .../devicetree/bindings/watchdog/fsl-imx-wdt.txt | 2 ++ arch/arm/boot/dts/imx6qdl-gw51xx.dtsi | 12 ++++++++++++ arch/arm/boot/dts/imx6qdl-gw52xx.dtsi | 12 ++++++++++++ arch/arm/boot/dts/imx6qdl-gw53xx.dtsi | 13 +++++++++++++ arch/arm/boot/dts/imx6qdl-gw54xx.dtsi | 17 +++++++++++++++++ arch/arm/boot/dts/imx6qdl-gw551x.dtsi | 12 ++++++++++++ arch/arm/boot/dts/imx6qdl-gw552x.dtsi | 12 ++++++++++++ drivers/watchdog/imx2_wdt.c | 17 +++++++++++++++-- 8 files changed, 95 insertions(+), 2 deletions(-) -- 1.9.1