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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 voltage for the CPU when coming out of reset at 800Mhz. This uses a new device-tree property 'fsl,ext-reset-output' 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. [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/333689.html Cc: Fabio Estevam <festevam@gmail.com> Cc: Lucas Stach <l.stach@pengutronix.de> Cc: Stefan Roese <sr@denx.de> Cc: Iain Paton <ipaton0@gmail.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Tim Harvey <tharvey@gateworks.com> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> Acked-by: Shawn Guo <shawn.guo@linaro.org> Tested-by: Akshay Bhat <akshay.bhat@timesys.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
23 lines
739 B
Plaintext
23 lines
739 B
Plaintext
* Freescale i.MX Watchdog Timer (WDT) Controller
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Required properties:
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- compatible : Should be "fsl,<soc>-wdt"
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- reg : Should contain WDT registers location and length
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- interrupts : Should contain WDT interrupt
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Optional properties:
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- big-endian: If present the watchdog device's registers are implemented
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in big endian mode, otherwise in native mode(same with CPU), for more
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detail please see: Documentation/devicetree/bindings/regmap/regmap.txt.
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- fsl,ext-reset-output: If present the watchdog device is configured to
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assert its external reset (WDOG_B) instead of issuing a software reset.
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Examples:
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wdt@73f98000 {
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compatible = "fsl,imx51-wdt", "fsl,imx21-wdt";
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reg = <0x73f98000 0x4000>;
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interrupts = <58>;
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big-endian;
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};
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