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overlays: Fix the rs485 support in uart[2345] #7177

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Merged
pelwell merged 2 commits into from
Dec 16, 2025
+24 −12
Merged

overlays: Fix the rs485 support in uart[2345] #7177

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c50ab98
overlays: Fix the rs485 support in uart[2345]
pelwell Dec 16, 2025
0e170c6
overlays: Add full-duplex rs485 support to uart2-5
pelwell Dec 16, 2025
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8 changes: 8 additions & 0 deletions arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -5325,6 +5325,8 @@ Params: ctsrts Enable CTS/RTS on GPIOs 2-3 (default off)
drive the OE pin of an RS485 transceiver (i.e.
MAX3078E); also enables the UARTx ctsrts
parameter, as RTS is required (default off).
rs485_full_duplex When RS485 mode is enabled, enables receiving of
data while sending data (default off)
rs485_invert_rts When RS485 mode is enabled, inverts the RTS
line from active-high (default) to active-low.
rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
Expand All @@ -5349,6 +5351,8 @@ Params: ctsrts Enable CTS/RTS on GPIOs 6-7 (default off)
drive the OE pin of an RS485 transceiver (i.e.
MAX3078E); also enables the UARTx ctsrts
parameter, as RTS is required (default off).
rs485_full_duplex When RS485 mode is enabled, enables receiving of
data while sending data (default off)
rs485_invert_rts When RS485 mode is enabled, inverts the RTS
line from active-high (default) to active-low.
rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
Expand All @@ -5373,6 +5377,8 @@ Params: ctsrts Enable CTS/RTS on GPIOs 10-11 (default off)
drive the OE pin of an RS485 transceiver (i.e.
MAX3078E); also enables the UARTx ctsrts
parameter, as RTS is required (default off).
rs485_full_duplex When RS485 mode is enabled, enables receiving of
data while sending data (default off)
rs485_invert_rts When RS485 mode is enabled, inverts the RTS
line from active-high (default) to active-low.
rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
Expand All @@ -5397,6 +5403,8 @@ Params: ctsrts Enable CTS/RTS on GPIOs 14-15 (default off)
drive the OE pin of an RS485 transceiver (i.e.
MAX3078E); also enables the UARTx ctsrts
parameter, as RTS is required (default off).
rs485_full_duplex When RS485 mode is enabled, enables receiving of
data while sending data (default off)
rs485_invert_rts When RS485 mode is enabled, inverts the RTS
line from active-high (default) to active-low.
rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
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7 changes: 4 additions & 3 deletions arch/arm/boot/dts/overlays/uart2-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,9 @@
};
};

rs485: fragment@2 {
fragment@2 {
target = <&uart2>;
__dormant__ {
rs485: __dormant__ {
linux,rs485-enabled-at-boot-time;
rs485-rts-delay = <0 0>;
};
Expand All @@ -30,7 +30,8 @@
__overrides__ {
ctsrts = <0>,"=1";
rs485 = <0>,"=1=2";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
rs485_full_duplex = <&rs485>,"rs485-rx-during-tx?";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
};
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7 changes: 4 additions & 3 deletions arch/arm/boot/dts/overlays/uart3-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,9 @@
};
};

rs485: fragment@2 {
fragment@2 {
target = <&uart3>;
__dormant__ {
rs485: __dormant__ {
linux,rs485-enabled-at-boot-time;
rs485-rts-delay = <0 0>;
};
Expand All @@ -30,7 +30,8 @@
__overrides__ {
ctsrts = <0>,"=1";
rs485 = <0>,"=1=2";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
rs485_full_duplex = <&rs485>,"rs485-rx-during-tx?";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
};
Expand Down
7 changes: 4 additions & 3 deletions arch/arm/boot/dts/overlays/uart4-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,9 @@
};
};

rs485: fragment@2 {
fragment@2 {
target = <&uart4>;
__dormant__ {
rs485: __dormant__ {
linux,rs485-enabled-at-boot-time;
rs485-rts-delay = <0 0>;
};
Expand All @@ -30,7 +30,8 @@
__overrides__ {
ctsrts = <0>,"=1";
rs485 = <0>,"=1=2";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
rs485_full_duplex = <&rs485>,"rs485-rx-during-tx?";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
};
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7 changes: 4 additions & 3 deletions arch/arm/boot/dts/overlays/uart5-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,9 @@
};
};

rs485: fragment@2 {
fragment@2 {
target = <&uart5>;
__dormant__ {
rs485: __dormant__ {
linux,rs485-enabled-at-boot-time;
rs485-rts-delay = <0 0>;
};
Expand All @@ -30,7 +30,8 @@
__overrides__ {
ctsrts = <0>,"=1";
rs485 = <0>,"=1=2";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
rs485_full_duplex = <&rs485>,"rs485-rx-during-tx?";
rs485_invert_rts = <&rs485>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
};
Expand Down