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d81c03f05e
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
184 lines
7.4 KiB
Diff
184 lines
7.4 KiB
Diff
From 9d79fae257c72b072f52e90e835e98d5cf8befca Mon Sep 17 00:00:00 2001
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From: Adam Wilson <adamwilson266@rocketmail.com>
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Date: Mon, 28 Apr 2025 14:06:21 +0100
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Subject: [PATCH] Add RS485 mode support for UART2, UART3, UART4, and UART5.
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---
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arch/arm/boot/dts/overlays/README | 52 ++++++++++++++++++++
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arch/arm/boot/dts/overlays/uart2-overlay.dts | 12 +++++
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arch/arm/boot/dts/overlays/uart3-overlay.dts | 12 +++++
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arch/arm/boot/dts/overlays/uart4-overlay.dts | 12 +++++
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arch/arm/boot/dts/overlays/uart5-overlay.dts | 12 +++++
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5 files changed, 100 insertions(+)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -5190,6 +5190,19 @@ Name: uart2
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Info: Enable uart 2 on GPIOs 0-3. BCM2711 only.
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Load: dtoverlay=uart2,<param>
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Params: ctsrts Enable CTS/RTS on GPIOs 2-3 (default off)
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+ rs485 Enable RS485 mode for using the RTS line to
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+ drive the OE pin of an RS485 transceiver (i.e.
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+ MAX3078E); also enables the UARTx ctsrts
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+ parameter, as RTS is required (default off).
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+ rs485_invert_rts When RS485 mode is enabled, inverts the RTS
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+ line from active-high (default) to active-low
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+ (default off).
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+ rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission starting
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+ and the RTS line being asserted (default 0).
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+ rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission ending
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+ and the RTS line being deasserted (default 0).
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Name: uart2-pi5
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@@ -5202,6 +5215,19 @@ Name: uart3
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Info: Enable uart 3 on GPIOs 4-7. BCM2711 only.
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Load: dtoverlay=uart3,<param>
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Params: ctsrts Enable CTS/RTS on GPIOs 6-7 (default off)
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+ rs485 Enable RS485 mode for using the RTS line to
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+ drive the OE pin of an RS485 transceiver (i.e.
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+ MAX3078E); also enables the UARTx ctsrts
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+ parameter, as RTS is required (default off).
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+ rs485_invert_rts When RS485 mode is enabled, inverts the RTS
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+ line from active-high (default) to active-low
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+ (default off).
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+ rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission starting
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+ and the RTS line being asserted (default 0).
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+ rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission ending
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+ and the RTS line being deasserted (default 0).
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Name: uart3-pi5
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@@ -5214,6 +5240,19 @@ Name: uart4
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Info: Enable uart 4 on GPIOs 8-11. BCM2711 only.
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Load: dtoverlay=uart4,<param>
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Params: ctsrts Enable CTS/RTS on GPIOs 10-11 (default off)
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+ rs485 Enable RS485 mode for using the RTS line to
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+ drive the OE pin of an RS485 transceiver (i.e.
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+ MAX3078E); also enables the UARTx ctsrts
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+ parameter, as RTS is required (default off).
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+ rs485_invert_rts When RS485 mode is enabled, inverts the RTS
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+ line from active-high (default) to active-low
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+ (default off).
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+ rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission starting
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+ and the RTS line being asserted (default 0).
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+ rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission ending
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+ and the RTS line being deasserted (default 0).
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Name: uart4-pi5
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@@ -5226,6 +5265,19 @@ Name: uart5
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Info: Enable uart 5 on GPIOs 12-15. BCM2711 only.
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Load: dtoverlay=uart5,<param>
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Params: ctsrts Enable CTS/RTS on GPIOs 14-15 (default off)
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+ rs485 Enable RS485 mode for using the RTS line to
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+ drive the OE pin of an RS485 transceiver (i.e.
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+ MAX3078E); also enables the UARTx ctsrts
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+ parameter, as RTS is required (default off).
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+ rs485_invert_rts When RS485 mode is enabled, inverts the RTS
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+ line from active-high (default) to active-low
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+ (default off).
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+ rs485_rts_on_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission starting
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+ and the RTS line being asserted (default 0).
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+ rs485_rts_off_delay When RS485 mode is enabled, sets the delay (in
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+ milliseconds) between data transmission ending
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+ and the RTS line being deasserted (default 0).
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Name: udrc
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--- a/arch/arm/boot/dts/overlays/uart2-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/uart2-overlay.dts
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@@ -19,7 +19,19 @@
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};
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};
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+ rs485: fragment@2 {
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+ target = <&uart2>;
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+ __dormant__ {
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+ linux,rs485-enabled-at-boot-time;
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+ rs485-rts-delay = <0 0>;
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+ };
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+ };
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+
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__overrides__ {
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ctsrts = <0>,"=1";
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+ rs485 = <0>,"=1=2";
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+ rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
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+ rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
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+ rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
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};
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};
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--- a/arch/arm/boot/dts/overlays/uart3-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/uart3-overlay.dts
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@@ -19,7 +19,19 @@
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};
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};
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+ rs485: fragment@2 {
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+ target = <&uart3>;
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+ __dormant__ {
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+ linux,rs485-enabled-at-boot-time;
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+ rs485-rts-delay = <0 0>;
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+ };
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+ };
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+
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__overrides__ {
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ctsrts = <0>,"=1";
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+ rs485 = <0>,"=1=2";
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+ rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
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+ rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
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+ rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
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};
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};
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--- a/arch/arm/boot/dts/overlays/uart4-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/uart4-overlay.dts
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@@ -19,7 +19,19 @@
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};
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};
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+ rs485: fragment@2 {
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+ target = <&uart4>;
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+ __dormant__ {
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+ linux,rs485-enabled-at-boot-time;
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+ rs485-rts-delay = <0 0>;
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+ };
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+ };
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+
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__overrides__ {
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ctsrts = <0>,"=1";
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+ rs485 = <0>,"=1=2";
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+ rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
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+ rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
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+ rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
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};
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};
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--- a/arch/arm/boot/dts/overlays/uart5-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/uart5-overlay.dts
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@@ -19,7 +19,19 @@
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};
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};
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+ rs485: fragment@2 {
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+ target = <&uart5>;
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+ __dormant__ {
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+ linux,rs485-enabled-at-boot-time;
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+ rs485-rts-delay = <0 0>;
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+ };
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+ };
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+
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__overrides__ {
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ctsrts = <0>,"=1";
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+ rs485 = <0>,"=1=2";
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+ rs485_invert_rts = <&rs485>,"rs485-rts-active-low";
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+ rs485_rts_on_delay = <&rs485>, "rs485-rts-delay:0";
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+ rs485_rts_off_delay = <&rs485>, "rs485-rts-delay:4";
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};
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};
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