Add a device tree overlay for SPI1 (spidev), UART3 and GPIO1 on
X27 connector.
By default, not all interfaces on the X27 connector are accessible
due to being disabled or set to alternative pin mux configurations.
This overlay activates and configures these interfaces to support
connections with external devices.
Signed-off-by: Wadim Egorov <w.egorov@xxxxxxxxx>
Signed-off-by: Daniel Schultz <d.schultz@xxxxxxxxx>
---
arch/arm64/boot/dts/ti/Makefile | 3 +
...phyboard-electra-x27-gpio1-spi1-uart3.dtso | 69 +++++++++++++++++++
2 files changed, 72 insertions(+)
create mode 100644 arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-x27-gpio1-spi1-uart3.dtso
diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index f71360f14f23..a05c9c5612fc 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -58,6 +58,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am642-evm-nand.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-rdk.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-gpio-fan.dtbo
dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-pcie-usb2.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-x27-gpio1-spi1-uart3.dtbo
dtb-$(CONFIG_ARCH_K3) += k3-am642-sk.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-sdcard.dtbo
@@ -186,6 +187,8 @@ k3-am642-phyboard-electra-gpio-fan-dtbs := \
k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-gpio-fan.dtbo
k3-am642-phyboard-electra-pcie-usb2-dtbs := \
k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-pcie-usb2.dtbo
+k3-am642-phyboard-electra-x27-gpio1-spi1-uart3-dtbs := \
+ k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-x27-gpio1-spi1-uart3.dtbo
k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs := \
k3-am642-tqma64xxl-mbax4xxl.dtb k3-am64-tqma64xxl-mbax4xxl-sdcard.dtbo
k3-am642-tqma64xxl-mbax4xxl-wlan-dtbs := \
diff --git a/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-x27-gpio1-spi1-uart3.dtso b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-x27-gpio1-spi1-uart3.dtso
new file mode 100644
index 000000000000..b80d8b6a4fc4
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-x27-gpio1-spi1-uart3.dtso
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (C) 2025 PHYTEC Messtechnik GmbH
+ * Authors:
+ * Wadim Egorov <w.egorov@xxxxxxxxx>
+ * Daniel Schultz <d.schultz@xxxxxxxxx>
+ *
+ * GPIO, SPI and UART examples for the X27 expansion connector.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include "k3-pinctrl.h"
+
+&{/} {
+ aliases {
+ serial5 = "/bus@f4000/serial@2830000";
+ };
+};
+
+&main_pmx0 {
+ main_gpio1_exp_header_gpio_pins_default: main-gpio1-exp-header-gpio-pins-default {
+ pinctrl-single,pins = <
+ AM64X_IOPAD(0x0220, PIN_INPUT, 7) /* (D14) SPI1_CS1.GPIO1_48 */
+ >;
+ };
+
+ main_spi1_pins_default: main-spi1-pins-default {
+ pinctrl-single,pins = <
+ AM64X_IOPAD(0x0224, PIN_INPUT, 0) /* (C14) SPI1_CLK */
+ AM64X_IOPAD(0x021C, PIN_OUTPUT, 0) /* (B14) SPI1_CS0 */
+ AM64X_IOPAD(0x0228, PIN_OUTPUT, 0) /* (B15) SPI1_D0 */
+ AM64X_IOPAD(0x022C, PIN_INPUT, 0) /* (A15) SPI1_D1 */
+ >;
+ };
+
+ main_uart3_pins_default: main-uart3-pins-default {
+ pinctrl-single,pins = <
+ AM64X_IOPAD(0x0048, PIN_INPUT, 2) /* (U20) GPMC0_AD3.UART3_RXD */
+ AM64X_IOPAD(0x004c, PIN_OUTPUT, 2) /* (U18) GPMC0_AD4.UART3_TXD */
+ >;
+ };
+};
+
+&main_gpio1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_gpio1_exp_header_gpio_pins_default>;
+ status = "okay";
+};
+
+&main_spi1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_spi1_pins_default>;
+ ti,pindir-d0-out-d1-in = <1>;
+ status = "okay";
+
+ spidev@0 {
+ compatible = "rohm,dh2228fv";
+ reg = <0>;
+ spi-max-frequency = <24000000>;
+ };
+};
+
+&main_uart3 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_uart3_pins_default>;
+ status = "okay";
+};
--
2.25.1
