diff options
| author | Farouk Bouabid <farouk.bouabid@theobroma-systems.com> | 2024-02-08 16:39:55 +0100 |
|---|---|---|
| committer | Farouk Bouabid <farouk.bouabid@theobroma-systems.com> | 2024-02-27 11:48:48 +0100 |
| commit | ac77a6cc3f0050f6f7bf3362bab4e0ba294627f3 (patch) | |
| tree | e740356ab1796ded2951ceb3ccc65cb136d9d083 | |
| parent | ef98741509464ed02f3aed81923dcb1b3308d336 (diff) | |
UPSTREAM: arm64: dts: rockchip: add rs485 support on uart2 of rk3399-puma-haikou
A hardware switch can set the rs485 transceiver into half or full duplex
mode.
Switching to the half-duplex mode requires the user to enable em485 on
uart5 using ioctl, DE/RE are both connected to GPIO2_C3 which is the
RTS signal for uart0. Implement GPIO2_C3 as rts-gpios with RTS_ON_SEND
option enabled (default) so that driver mode gets enabled while sending
(RTS high) and receiver mode gets enabled while not sending (RTS low).
In full-duplex mode (em485 is disabled), DE is connected to GPIO2_C3 and
RE is grounded (enabled). Since GPIO2_C3 is implemented as rts-gpios, the
driver mode gets enabled whenever we want to send something and RE is not
affected (always enabled) in this case by the state of RTS.
Signed-off-by: Farouk Bouabid <farouk.bouabid@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240208-dev-rx-enable-v6-1-39e68e17a339@theobroma-systems.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
(cherry picked from commit 54448f711aa32f176534bbd7b1903cc6d1c8a50d)
(Some baudrates are instable while testing on Puma v2.3. Refer to
https://cherrydh.atlassian.net/browse/PUMA-98)
Signed-off-by: Farouk Bouabid <farouk.bouabid@theobroma-systems.com>
| -rw-r--r-- | arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts index 5736ffe4ce81..bb434416cfee 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts @@ -280,11 +280,12 @@ &uart0 { pinctrl-names = "default"; - pinctrl-0 = <&uart0_xfer &uart0_cts &uart0_rts>; + pinctrl-0 = <&uart0_xfer>; status = "okay"; }; &uart2 { + rts-gpios = <&gpio2 RK_PC3 GPIO_ACTIVE_HIGH>; status = "okay"; }; |