armv7R: dts: k3: am654: Add MCU_UART0 related definitions

Although we currently use the MAIN_UART0 for R5 SPL console output there
are cases where we require access to the MCU_UART0 as well for example in
case of UART-based Y-Modem boot. To support these scenarios add related
DTS definitions to be able to use that UART early on.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>

diff --git a/arch/arm/dts/k3-am654-r5-base-board.dts b/arch/arm/dts/k3-am654-r5-base-board.dts
index 7ed307f0d84c68af437d1367f3e36b9fdc08907b..e31ed4fe640d859b6b97b7a483c74c49b189838f 100644 (file)
--- a/arch/arm/dts/k3-am654-r5-base-board.dts
+++ b/arch/arm/dts/k3-am654-r5-base-board.dts
@@ -16,6 +16,7 @@
 
        aliases {
                serial0 = &wkup_uart0;
+               serial1 = &mcu_uart0;
                serial2 = &main_uart0;
        };
 
@@ -118,6 +119,14 @@
        status = "okay";
 };
 
+&mcu_uart0 {
+       u-boot,dm-spl;
+       pinctrl-names = "default";
+       pinctrl-0 = <&mcu_uart0_pins_default>;
+       clock-frequency = <48000000>;
+       status = "okay";
+};
+
 &main_uart0 {
        power-domains = <&k3_pds 146 TI_SCI_PD_SHARED>;
 };
@@ -141,6 +150,16 @@
                u-boot,dm-spl;
        };
 
+       mcu_uart0_pins_default: mcu_uart0_pins_default {
+               pinctrl-single,pins = <
+                       AM65X_WKUP_IOPAD(0x0044, PIN_INPUT, 4)  /* (P4) MCU_OSPI1_D1.MCU_UART0_RXD */
+                       AM65X_WKUP_IOPAD(0x0048, PIN_OUTPUT, 4) /* (P5) MCU_OSPI1_D2.MCU_UART0_TXD */
+                       AM65X_WKUP_IOPAD(0x004C, PIN_INPUT, 4)  /* (P1) MCU_OSPI1_D3.MCU_UART0_CTSn */
+                       AM65X_WKUP_IOPAD(0x0054, PIN_OUTPUT, 4) /* (N3) MCU_OSPI1_CSn1.MCU_UART0_RTSn */
+               >;
+               u-boot,dm-spl;
+       };
+
        wkup_i2c0_pins_default: wkup-i2c0-pins-default {
                pinctrl-single,pins = <
                        AM65X_WKUP_IOPAD(0x00e0, PIN_INPUT, 0) /* (AC7) WKUP_I2C0_SCL */