threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
* RS485 serial communications
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The RTS signal is capable of automatically controlling line direction for
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the built-in half-duplex mode.
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The properties described hereafter shall be given to a half-duplex capable
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UART node.
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Optional properties:
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- rs485-rts-delay: prop-encoded-array <a b> where:
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* a is the delay between rts signal and beginning of data sent in milliseconds.
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it corresponds to the delay before sending data.
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* b is the delay between end of data sent and rts signal in milliseconds
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it corresponds to the delay after sending data and actual release of the line.
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If this property is not specified, <0 0> is assumed.
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- linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485
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feature at boot time. It can be disabled later with proper ioctl.
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- rs485-rx-during-tx: empty property that enables the receiving of data even
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whilst sending data.
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RS485 example for Atmel USART:
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usart0: serial@fff8c000 {
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compatible = "atmel,at91sam9260-usart";
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reg = <0xfff8c000 0x4000>;
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interrupts = <7>;
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atmel,use-dma-rx;
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atmel,use-dma-tx;
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linux,rs485-enabled-at-boot-time;
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rs485-rts-delay = <0 200>; // in milliseconds
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};
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