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linux-sg2042/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.txt

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watchdog: imx2_wdt: add device tree probe support Adds device tree probe support for imx2_wdt driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-07-18 11:15:21 +08:00
* Freescale i.MX Watchdog Timer (WDT) Controller
Required properties:
- compatible : Should be "fsl,<soc>-wdt"
- reg : Should contain WDT registers location and length
- interrupts : Should contain WDT interrupt
watchdog: imx2_wdt: add external reset support via dt prop 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>
2016-04-01 23:16:43 +08:00
Optional properties:
watchdog: imx2_wdt: adds big endianness support. This watchdog driver will be working on IMX2+, Vybrid, LS1, LS2+ platforms, and will be in different endianness mode in those SoCs: SoCs WDT endian mode ------------------------------------ IMX2+ LE Vybird LE LS1 BE LS2 LE Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-06-03 10:45:14 +08:00
- big-endian: If present the watchdog device's registers are implemented
watchdog: imx2_wdt: Convert to use regmap framework's endianness method. Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-08-18 16:12:50 +08:00
in big endian mode, otherwise in native mode(same with CPU), for more
detail please see: Documentation/devicetree/bindings/regmap/regmap.txt.
watchdog: imx2_wdt: add external reset support via dt prop 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>
2016-04-01 23:16:43 +08:00
- fsl,ext-reset-output: If present the watchdog device is configured to
assert its external reset (WDOG_B) instead of issuing a software reset.
watchdog: imx2_wdt: adds big endianness support. This watchdog driver will be working on IMX2+, Vybrid, LS1, LS2+ platforms, and will be in different endianness mode in those SoCs: SoCs WDT endian mode ------------------------------------ IMX2+ LE Vybird LE LS1 BE LS2 LE Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-06-03 10:45:14 +08:00
watchdog: imx2_wdt: add device tree probe support Adds device tree probe support for imx2_wdt driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-07-18 11:15:21 +08:00
Examples:
wdt@73f98000 {
compatible = "fsl,imx51-wdt", "fsl,imx21-wdt";
reg = <0x73f98000 0x4000>;
interrupts = <58>;
watchdog: imx2_wdt: adds big endianness support. This watchdog driver will be working on IMX2+, Vybrid, LS1, LS2+ platforms, and will be in different endianness mode in those SoCs: SoCs WDT endian mode ------------------------------------ IMX2+ LE Vybird LE LS1 BE LS2 LE Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-06-03 10:45:14 +08:00
big-endian;
watchdog: imx2_wdt: add device tree probe support Adds device tree probe support for imx2_wdt driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-07-18 11:15:21 +08:00
};