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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2025-01-06 17:06:42 +0100 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2025-02-25 08:32:57 +0800 |
| commit | 4252ede53d46e945b07ea370aca07e2b3e44726e (patch) | |
| tree | a1ca993efdb93c276b5cc17bdbb607e44b04744b | |
| parent | 6e887c950cb26b555ddf274120b97ace670d7696 (diff) | |
| download | linux-4252ede53d46e945b07ea370aca07e2b3e44726e.tar.gz linux-4252ede53d46e945b07ea370aca07e2b3e44726e.zip | |
arm64: dts: imx8mp-skov: configure uart1 for RS485
uart1 TX, RX and RTS signals go off the base board and to a RS485
transceiver. Describe this in the device tree.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
| -rw-r--r-- | arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi index 7ae686d37dda..bce23d62cd27 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi @@ -404,6 +404,13 @@ pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart1>; status = "okay"; + /* + * While there is no CTS line, the property "uart-has-rtscts" is still + * the right thing to do to enable the UART to do RS485. In RS485-Mode + * CTS isn't used anyhow and there is no dedicated property + * "uart-has-rts-but-no-cts". + */ + uart-has-rtscts; }; &uart2 { @@ -618,6 +625,8 @@ MX8MP_IOMUXC_UART1_RXD__UART1_DCE_RX 0x140 MX8MP_IOMUXC_UART1_TXD__UART1_DCE_TX 0x140 MX8MP_IOMUXC_UART3_RXD__UART1_DTE_RTS 0x140 + /* CTS pin is not connected, but needed as workaround */ + MX8MP_IOMUXC_UART3_TXD__UART1_DTE_CTS 0x140 >; }; |