From: Manikanta Guntupalli manikanta.guntupalli@amd.com
Add "rs485-rts-delay" property to uartps node with delay_rts_before_send and delay_rts_after_send values as 10ms for rs485 mode on KD240.
10ms rts delay values have been chosen based on testing with rs485 temperature sensor (which is part of the kit) as safe minimum value for reliable operation at a baud rate of 9600.
Signed-off-by: Manikanta Guntupalli manikanta.guntupalli@amd.com Signed-off-by: Michal Simek michal.simek@amd.com ---
arch/arm/dts/zynqmp-sck-kd-g-revA.dtso | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/dts/zynqmp-sck-kd-g-revA.dtso b/arch/arm/dts/zynqmp-sck-kd-g-revA.dtso index 1727a1cc15c1..4de29d5d3ff6 100644 --- a/arch/arm/dts/zynqmp-sck-kd-g-revA.dtso +++ b/arch/arm/dts/zynqmp-sck-kd-g-revA.dtso @@ -358,6 +358,7 @@ status = "okay"; rts-gpios = <&gpio 72 GPIO_ACTIVE_HIGH>; linux,rs485-enabled-at-boot-time; + rs485-rts-delay = <10 10>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart0_default>; assigned-clock-rates = <100000000>;