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author | Tim Harvey <tharvey@gateworks.com> | 2022-02-14 15:14:21 -0800 |
---|---|---|
committer | Shawn Guo <shawnguo@kernel.org> | 2022-02-21 12:15:38 +0800 |
commit | 665f7f1ce8a7e121abb289aa6791ad0855a80008 (patch) | |
tree | c3da40275242d01a2d087e586aba874642549c15 | |
parent | a72ba91e5bc78d2b1b4712839399bbc41a629682 (diff) | |
download | linux-stable-665f7f1ce8a7e121abb289aa6791ad0855a80008.tar.gz linux-stable-665f7f1ce8a7e121abb289aa6791ad0855a80008.tar.bz2 linux-stable-665f7f1ce8a7e121abb289aa6791ad0855a80008.zip |
arm64: dts: imx8mm-venice-gw73xx-0x: add dt overlays for serial modes
The imx8mm-venice-gw73xx-0x som+baseboard combination has a multi-protocol
RS-232/RS-485/RS-422 transceiver to an off-board connector which
can be configured in a number of ways via UART and GPIO configuration.
The default configuration per the imx8mm-venice-gw73xx-0x dts is for
UART2 TX/RX and UART4 TX/RX to be available as RS-232:
J15.1 UART2 TX out
J15.2 UART2 RX in
J15.3 UART4 TX out
J15.4 UART4 RX in
J15.5 GND
Add dt overlays to allow additional the modes of operation:
rs232-rts (UART2 RS-232 with RTS/CTS hardware flow control)
J15.1 TX out
J15.2 RX in
J15.3 RTS out
J15.4 CTS in
J15.5 GND
rs485 (UART2 RS-485 half duplex)
J15.1 TXRX-
J15.2 N/C
J15.3 TXRX+
J15.4 N/C
J15.5 GND
rs422 (UART2 RS-422 full duplex)
J15.1 TX-
J15.2 RX+
J15.3 TX+
J15.4 RX-
J15.5 GND
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
4 files changed, 183 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile index 55b47cc11490..ea798b7bb286 100644 --- a/arch/arm64/boot/dts/freescale/Makefile +++ b/arch/arm64/boot/dts/freescale/Makefile @@ -99,6 +99,14 @@ dtb-$(CONFIG_ARCH_MXC) += imx8qxp-colibri-eval-v3.dtb dtb-$(CONFIG_ARCH_MXC) += imx8qxp-mek.dtb dtb-$(CONFIG_ARCH_MXC) += imx8ulp-evk.dtb +imx8mm-venice-gw73xx-0x-rs232-rts-dtbs := imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs232-rts.dtbo +imx8mm-venice-gw73xx-0x-rs422-dtbs := imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs422.dtbo +imx8mm-venice-gw73xx-0x-rs485-dtbs := imx8mm-venice-gw73xx-0x.dtb imx8mm-venice-gw73xx-0x-rs485.dtbo + +dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs232-rts.dtb +dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs422.dtb +dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs485.dtb + dtb-$(CONFIG_ARCH_S32) += s32g274a-evb.dtb dtb-$(CONFIG_ARCH_S32) += s32g274a-rdb2.dtb dtb-$(CONFIG_ARCH_S32) += s32v234-evb.dtb diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts new file mode 100644 index 000000000000..2fa635e1c1a8 --- /dev/null +++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dts @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright 2022 Gateworks Corporation + * + * GW73xx RS232 with RTS/CTS hardware flow control: + * - GPIO4_0 rs485_en needs to be driven low (in-active) + * - UART4_TX becomes RTS + * - UART4_RX becomes CTS + */ + +#include <dt-bindings/gpio/gpio.h> + +#include "imx8mm-pinfunc.h" + +/dts-v1/; +/plugin/; + +&{/} { + compatible = "gw,imx8mm-gw73xx-0x"; +}; + +&gpio4 { + rs485_en { + gpio-hog; + gpios = <0 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "rs485_en"; + }; +}; + +&uart2 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uart2>; + rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>; + cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>; + uart-has-rtscts; + status = "okay"; +}; + +&uart4 { + status = "disabled"; +}; + +&iomuxc { + pinctrl_uart2: uart2grp { + fsl,pins = < + MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 + MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 + MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 + MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140 + >; + }; +}; diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs422.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs422.dts new file mode 100644 index 000000000000..3e6404340d52 --- /dev/null +++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs422.dts @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright 2021 Gateworks Corporation + * + * GW73xx RS422 (RS485 full duplex): + * - GPIO1_0 rs485_term selects on-chip termination + * - GPIO4_0 rs485_en needs to be driven high (active) + * - GPIO4_2 rs485_hd needs to be driven low (in-active) + * - UART4_TX is DE for RS485 transmitter + * - RS485_EN needs to be pulled high + * - RS485_HALF needs to be low + */ + +#include <dt-bindings/gpio/gpio.h> + +#include "imx8mm-pinfunc.h" + +/dts-v1/; +/plugin/; + +&{/} { + compatible = "gw,imx8mm-gw73xx-0x"; +}; + +&gpio4 { + rs485_en { + gpio-hog; + gpios = <0 GPIO_ACTIVE_HIGH>; + output-high; + line-name = "rs485_en"; + }; + + rs485_hd { + gpio-hog; + gpios = <2 GPIO_ACTIVE_HIGH>; + output-low; + line-name = "rs485_hd"; + }; +}; + +&uart2 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uart2>; + rts-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>; + linux,rs485-enabled-at-boot-time; + status = "okay"; +}; + +&uart4 { + status = "disabled"; +}; + +&iomuxc { + pinctrl_uart2: uart2grp { + fsl,pins = < + MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 + MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 + MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 + >; + }; +}; diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs485.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs485.dts new file mode 100644 index 000000000000..2c71ab9854cb --- /dev/null +++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs485.dts @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright 2021 Gateworks Corporation + * + * GW73xx RS485 HD: + * - GPIO1_0 rs485_term selects on-chip termination + * - GPIO4_0 rs485_en needs to be driven high (active) + * - GPIO4_2 rs485_hd needs to be driven high (active) + * - UART4_TX is DE for RS485 transmitter + * - RS485_EN needs to be pulled high + * - RS485_HALF needs to be pulled high + */ + +#include <dt-bindings/gpio/gpio.h> + +#include "imx8mm-pinfunc.h" + +/dts-v1/; +/plugin/; + +&{/} { + compatible = "gw,imx8mm-gw73xx-0x"; +}; + +&gpio4 { + rs485_en { + gpio-hog; + gpios = <0 GPIO_ACTIVE_HIGH>; + output-high; + line-name = "rs485_en"; + }; + + rs485_hd { + gpio-hog; + gpios = <2 GPIO_ACTIVE_HIGH>; + output-high; + line-name = "rs485_hd"; + }; +}; + +&uart2 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uart2>; + rts-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>; + linux,rs485-enabled-at-boot-time; + status = "okay"; +}; + +&uart4 { + status = "disabled"; +}; + +&iomuxc { + pinctrl_uart2: uart2grp { + fsl,pins = < + MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 + MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 + MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 + >; + }; +}; |