Can I Use rts-gpios in the Device Tree or is it not supported

[SLetter]

stm32mp157f, I need to use uart5 to drive an rs485 but the hardware supplied DE pin is already in use.  So I need to configure a different GPIO to use.  If the device tree binding rts-gpios is supported, then the task is simplified. We can modify the board to use the gpio.  Follow up to that, if it is supported do I still add "linux,rs485-enabled-at-boot-time;" 

[Erwan SZYMANSKI]

Hello @SLetter ,
Please double check your device tree and pinctrl configuration. You can get inspired by such community post that already deals with you topic : https://community.st.com/t5/stm32-mpus-products/how-to-enable-hardware-flow-control-rs485/td-p/277263

Kind regards,
Erwan.

[SLetter]

I don't see where this addresses my question, perhaps I don't understand?  I am aware that I can do this with some coding in kernel but my understanding was that most of what I would need to do was already done if you include rts-gpios in the devtree definition for the uart.  

My current dts entry:

uart5_pins_mx: uart5_mx-0 {
     pins1 {
     pinmux = <STM32_PINMUX('B', 12, AF14)>; /* UART5_RX */
     bias-disable;
     };
     pins2 {
     pinmux = <STM32_PINMUX('B', 13, AF14)>; /* UART5_TX */
     bias-disable;
     drive-push-pull;
     slew-rate = <0>;
     };
};

# idle and sleep not included for brevity

&uart5{
     pinctrl-names = "default", "idle", "sleep";
     pinctrl-0 = <&uart5_pins_mx>;
     pinctrl-1 = <&uart5_idle_pins_mx>;
     pinctrl-2 = <&uart5_sleep_pins_mx>;
     status = "okay";

     /* USER CODE BEGIN uart5 */
     linux,rs485-enabled-at-boot-time;
     rts-gpios = <&gpiof 3 GPIO_ACTIVE_HIGH>;
     /* USER CODE END uart5 */
};