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overlays: Add rs485 support to uart[0-4]-pi5 #7246

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70 changes: 70 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 @@ -5367,6 +5367,20 @@ Name: uart0-pi5
Info: Enable uart 0 on GPIOs 14-15. Pi 5 only.
Load: dtoverlay=uart0-pi5,<param>
Params: ctsrts Enable CTS/RTS on GPIOs 16-17 (default off)
rs485 Enable RS485 mode for using the RTS line to
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
milliseconds) between data transmission starting
and the RTS line being asserted (default 0).
rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
milliseconds) between data transmission ending
and the RTS line being deasserted (default 0).


Name: uart1
Expand All @@ -5381,6 +5395,20 @@ Name: uart1-pi5
Info: Enable uart 1 on GPIOs 0-1. Pi 5 only.
Load: dtoverlay=uart1-pi5,<param>
Params: ctsrts Enable CTS/RTS on GPIOs 2-3 (default off)
rs485 Enable RS485 mode for using the RTS line to
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
milliseconds) between data transmission starting
and the RTS line being asserted (default 0).
rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
milliseconds) between data transmission ending
and the RTS line being deasserted (default 0).


Name: uart2
Expand All @@ -5407,6 +5435,20 @@ Name: uart2-pi5
Info: Enable uart 2 on GPIOs 4-5. Pi 5 only.
Load: dtoverlay=uart2-pi5,<param>
Params: ctsrts Enable CTS/RTS on GPIOs 6-7 (default off)
rs485 Enable RS485 mode for using the RTS line to
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
milliseconds) between data transmission starting
and the RTS line being asserted (default 0).
rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
milliseconds) between data transmission ending
and the RTS line being deasserted (default 0).


Name: uart3
Expand All @@ -5433,6 +5475,20 @@ Name: uart3-pi5
Info: Enable uart 3 on GPIOs 8-9. Pi 5 only.
Load: dtoverlay=uart3-pi5,<param>
Params: ctsrts Enable CTS/RTS on GPIOs 10-11 (default off)
rs485 Enable RS485 mode for using the RTS line to
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
milliseconds) between data transmission starting
and the RTS line being asserted (default 0).
rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
milliseconds) between data transmission ending
and the RTS line being deasserted (default 0).


Name: uart4
Expand All @@ -5459,6 +5515,20 @@ Name: uart4-pi5
Info: Enable uart 4 on GPIOs 12-13. Pi 5 only.
Load: dtoverlay=uart4-pi5,<param>
Params: ctsrts Enable CTS/RTS on GPIOs 14-15 (default off)
rs485 Enable RS485 mode for using the RTS line to
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
milliseconds) between data transmission starting
and the RTS line being asserted (default 0).
rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
milliseconds) between data transmission ending
and the RTS line being deasserted (default 0).


Name: uart5
Expand Down
7 changes: 7 additions & 0 deletions arch/arm/boot/dts/overlays/uart0-pi5-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,17 @@
frag0: __overlay__ {
status = "okay";
pinctrl-0 = <&uart0_pins>;
rs485-rts-delay = <0 0>;
};
};

__overrides__ {
ctsrts = <&frag0>,"pinctrl-0:4=",<&uart0_ctsrts_pins>;
rs485 = <&frag0>,"pinctrl-0:4=",<&uart0_ctsrts_pins>,
<&frag0>,"linux,rs485-enabled-at-boot-time?";
rs485_full_duplex = <&frag0>,"rs485-rx-during-tx?";
rs485_invert_rts = <&frag0>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&frag0>,"rs485-rts-delay:0";
rs485_rts_off_delay = <&frag0>,"rs485-rts-delay:4";
};
};
7 changes: 7 additions & 0 deletions arch/arm/boot/dts/overlays/uart1-pi5-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,17 @@
frag0: __overlay__ {
status = "okay";
pinctrl-0 = <&uart1_pins>;
rs485-rts-delay = <0 0>;
};
};

__overrides__ {
ctsrts = <&frag0>,"pinctrl-0:4=",<&uart1_ctsrts_pins>;
rs485 = <&frag0>,"pinctrl-0:4=",<&uart1_ctsrts_pins>,
<&frag0>,"linux,rs485-enabled-at-boot-time?";
rs485_full_duplex = <&frag0>,"rs485-rx-during-tx?";
rs485_invert_rts = <&frag0>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&frag0>,"rs485-rts-delay:0";
rs485_rts_off_delay = <&frag0>,"rs485-rts-delay:4";
};
};
7 changes: 7 additions & 0 deletions arch/arm/boot/dts/overlays/uart2-pi5-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,17 @@
frag0: __overlay__ {
status = "okay";
pinctrl-0 = <&uart2_pins>;
rs485-rts-delay = <0 0>;
};
};

__overrides__ {
ctsrts = <&frag0>,"pinctrl-0:4=",<&uart2_ctsrts_pins>;
rs485 = <&frag0>,"pinctrl-0:4=",<&uart2_ctsrts_pins>,
<&frag0>,"linux,rs485-enabled-at-boot-time?";
rs485_full_duplex = <&frag0>,"rs485-rx-during-tx?";
rs485_invert_rts = <&frag0>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&frag0>,"rs485-rts-delay:0";
rs485_rts_off_delay = <&frag0>,"rs485-rts-delay:4";
};
};
7 changes: 7 additions & 0 deletions arch/arm/boot/dts/overlays/uart3-pi5-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,17 @@
frag0: __overlay__ {
status = "okay";
pinctrl-0 = <&uart3_pins>;
rs485-rts-delay = <0 0>;
};
};

__overrides__ {
ctsrts = <&frag0>,"pinctrl-0:4=",<&uart3_ctsrts_pins>;
rs485 = <&frag0>,"pinctrl-0:4=",<&uart3_ctsrts_pins>,
<&frag0>,"linux,rs485-enabled-at-boot-time?";
rs485_full_duplex = <&frag0>,"rs485-rx-during-tx?";
rs485_invert_rts = <&frag0>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&frag0>,"rs485-rts-delay:0";
rs485_rts_off_delay = <&frag0>,"rs485-rts-delay:4";
};
};
7 changes: 7 additions & 0 deletions arch/arm/boot/dts/overlays/uart4-pi5-overlay.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,10 +9,17 @@
frag0: __overlay__ {
status = "okay";
pinctrl-0 = <&uart4_pins>;
rs485-rts-delay = <0 0>;
};
};

__overrides__ {
ctsrts = <&frag0>,"pinctrl-0:4=",<&uart4_ctsrts_pins>;
rs485 = <&frag0>,"pinctrl-0:4=",<&uart4_ctsrts_pins>,
<&frag0>,"linux,rs485-enabled-at-boot-time?";
rs485_full_duplex = <&frag0>,"rs485-rx-during-tx?";
rs485_invert_rts = <&frag0>,"rs485-rts-active-low?";
rs485_rts_on_delay = <&frag0>,"rs485-rts-delay:0";
rs485_rts_off_delay = <&frag0>,"rs485-rts-delay:4";
};
};