clean baseparameter

hc

2023-11-20 520ec20d74dfd87f62fd58b921b7209d6daed94a

 kernel/Documentation/devicetree/bindings/mailbox/rockchip-mailbox.txt
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@@ -17,6 +17,10 @@
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  - #mbox-cells: Common mailbox binding property to identify the number
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 	of cells required for the mailbox specifier. Should be 1
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+Optional properties :
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+
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+ - rockchip,txpoll-period-ms: TX Done polling interval in milliseconds.
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+
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 Example:
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 --------
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