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This watchdog is instantiated in a FPGA that is memory mapped. It is made of only one register, called the feed register. Writing to this register will re-arm the watchdog for a given time (and enable it if it was disable). It can be disabled by writing a special value into it. It is part of a syscon block, and the watchdog register offset in this block varies from board to board. This offset is passed in the syscon property after the phandle to the syscon node. Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
26 lines
603 B
Plaintext
26 lines
603 B
Plaintext
Technologic Systems Watchdog
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Required properties:
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- compatible: must be "technologic,ts4800-wdt"
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- syscon: phandle / integer array that points to the syscon node which
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describes the FPGA's syscon registers.
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- phandle to FPGA's syscon
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- offset to the watchdog register
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Optional property:
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- timeout-sec: contains the watchdog timeout in seconds.
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Example:
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syscon: syscon@b0010000 {
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compatible = "syscon", "simple-mfd";
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reg = <0xb0010000 0x3d>;
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reg-io-width = <2>;
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wdt@e {
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compatible = "technologic,ts4800-wdt";
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syscon = <&syscon 0xe>;
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timeout-sec = <10>;
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};
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}
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