From: Manikanta Guntupalli Date: Thu, 18 Jul 2024 10:15:23 +0000 (+0200) Subject: arm64: zynqmp: dts: Add rts delay property for rs485 mode on KD240 X-Git-Url: http://git.dujemihanovic.xyz/img/sics.gif?a=commitdiff_plain;h=1e49d7f50e4a816b27d7728792e01fd845980c9a;p=u-boot.git arm64: zynqmp: dts: Add rts delay property for rs485 mode on KD240 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 Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/0e0c4c067236e11f661c1d067017e1ca975c9ddb.1721297721.git.michal.simek@amd.com --- diff --git a/arch/arm/dts/zynqmp-sck-kd-g-revA.dtso b/arch/arm/dts/zynqmp-sck-kd-g-revA.dtso index 1727a1cc15..4de29d5d3f 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>;