ARM: i.MX8MN: add i.MX8MN-EVK support

With driver support in place, we can now build and run barebox in the
i.MX8MN. Following tested working:

  - Setting up DDR4 SDRAM
  - Booting from SD-Card
  - Booting from eMMC
  - Updating barebox in SD-Card/eMMC boot partition
  - USB Fastboot, ACM gadgets
  - UART
  - Early I2C with bd71837
  - Ethernet
  - Loading and communicating with TF-A

The resulting image supports both DDR4 and LPDDR4. They use different
PMICs, so probing the i2c addresses of them indicates what DRAM type
to setup. I have only tested this on a DDR4 EVK, but the LPDDR4 code
is equivalent to what's already used in barebox with i.MX8M Mini
and Plus, so it should work(tm).

Notably missing:

  - boot from USB SDP doesn't work. early debug_ll doesn't indicate
    that barebox PBL was actually entered.

This can follow later though.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20211001100949.6891-9-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

2 files changed, 63 insertions, 0 deletions

diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index ffa9fe88c1..bc78037c7d 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -125,6 +125,7 @@ lwl-$(CONFIG_MACH_TECHNEXION_WANDBOARD) += imx6q-wandboard.dtb.o imx6dl-wandboar
 lwl-$(CONFIG_MACH_TECHNEXION_PICO_HOBBIT) += imx6ul-pico-hobbit.dtb.o
 lwl-$(CONFIG_MACH_NXP_IMX6ULL_EVK) += imx6ull-14x14-evk.dtb.o
 lwl-$(CONFIG_MACH_NXP_IMX8MM_EVK) += imx8mm-evk.dtb.o
+lwl-$(CONFIG_MACH_NXP_IMX8MN_EVK) += imx8mn-evk.dtb.o
 lwl-$(CONFIG_MACH_NXP_IMX8MP_EVK) += imx8mp-evk.dtb.o
 lwl-$(CONFIG_MACH_NXP_IMX8MQ_EVK) += imx8mq-evk.dtb.o
 lwl-$(CONFIG_MACH_TORADEX_COLIBRI_T20) += tegra20-colibri-iris.dtb.o
diff --git a/arch/arm/dts/imx8mn-evk.dts b/arch/arm/dts/imx8mn-evk.dts
new file mode 100644
index 0000000000..9fe24b3184
--- /dev/null
+++ b/arch/arm/dts/imx8mn-evk.dts
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright 2017 NXP
+ * Copyright (C) 2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
+ */
+
+/dts-v1/;
+
+#include <arm64/freescale/imx8mn-evk.dts>
+
+/ {
+	chosen {
+		environment-sd {
+			compatible = "barebox,environment";
+			device-path = &usdhc2, "partname:barebox-environment";
+			status = "disabled";
+		};
+		environment-emmc {
+			compatible = "barebox,environment";
+			device-path = &usdhc3, "partname:barebox-environment";
+			status = "disabled";
+		};
+	};
+};
+
+&fec1 {
+	phy-reset-gpios = <&gpio4 22 GPIO_ACTIVE_LOW>;
+};
+
+&usdhc2 {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	partition@0 {
+		label = "barebox";
+		reg = <0x0 0xe0000>;
+	};
+
+	partition@e0000 {
+		label = "barebox-environment";
+		reg = <0xe0000 0x20000>;
+	};
+};
+
+&usdhc3 {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	partition@0 {
+		label = "barebox";
+		reg = <0x0 0xe0000>;
+	};
+
+	partition@e0000 {
+		label = "barebox-environment";
+		reg = <0xe0000 0x20000>;
+	};
+};
+
+&ocotp {
+	barebox,provide-mac-address = <&fec1 0x640>;
+};