[PATCH 2/5] brppt1: Fix SPL boot stage

[Bernhard Messerklinger]

Commit 6337d53fdf45 ("arm: dts: sync am33xx with Linux 5.9-rc7") syncs
the am335x device tree with the latest linux kernel am335x device tree.
That causes problems with device tree in SPL stage.
To fix the issues CONFIG_SPL_OF_TRANSLATE must be set to handle the
synced bus addresses correctly.
A custom U-Boot device tree is also needed since the SPL build removes
bus properties from bus nodes which are not explicitly marked with the
u-boot,dm-spl or u-boot,dm-pre-reloc flag. Therefore all parent buses of
the in the SPL needed devices must be marked with u-boot,dm-pre-reloc.
Also since there is no driver for "ti,sysc" compatible property in SPL
the buses marked with this compatible string must also be marked with
compatible = "simple-bus" to make the underlying devices visible in
SPL. Otherwise the matching device drivers aren't found and the uclass
drivers are dropped.

Signed-off-by: Bernhard Messerklinger <bernhard.messerklinger at br-automation.com>
---

 arch/arm/dts/am335x-brppt1-mmc-u-boot.dtsi | 80 ++++++++++++++++++++++
 configs/brppt1_mmc_defconfig               |  2 +-
 2 files changed, 81 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/dts/am335x-brppt1-mmc-u-boot.dtsi

diff --git a/arch/arm/dts/am335x-brppt1-mmc-u-boot.dtsi b/arch/arm/dts/am335x-brppt1-mmc-u-boot.dtsi
new file mode 100644
index 0000000000..0b9a1ccef4
--- /dev/null
+++ b/arch/arm/dts/am335x-brppt1-mmc-u-boot.dtsi
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 B&R Industrial Automation GmbH -
+ * https://www.br-automation.com/
+ */
+
+/ {
+	ocp {
+		u-boot,dm-pre-reloc;
+	};
+};
+
+&l4_wkup {
+	u-boot,dm-pre-reloc;
+	segment at 200000 {
+		u-boot,dm-pre-reloc;
+		target-module at 0
+		{
+			u-boot,dm-pre-reloc;
+			compatible = "simple-bus";
+		};
+		target-module at 7000 {
+			u-boot,dm-pre-reloc;
+			compatible = "simple-bus";
+		};
+		target-module at 9000 {
+			u-boot,dm-pre-reloc;
+			compatible = "simple-bus";
+		};
+	};
+};
+
+&wkup_cm {
+	u-boot,dm-pre-reloc;
+};
+
+&l4_wkup_clkctrl {
+	u-boot,dm-pre-reloc;
+};
+
+&l4_per {
+	u-boot,dm-pre-reloc;
+	segment at 0 {
+		u-boot,dm-pre-reloc;
+		compatible = "simple-bus";
+		target-module at 4c000 {
+			u-boot,dm-pre-reloc;
+			compatible = "simple-bus";
+		};
+	};
+
+	segment at 100000 {
+		u-boot,dm-pre-reloc;
+		compatible = "simple-bus";
+		target-module at ac000 {
+			u-boot,dm-pre-reloc;
+			compatible = "simple-bus";
+		};
+		target-module at ae000 {
+			u-boot,dm-pre-reloc;
+			compatible = "simple-bus";
+		};
+	};
+};
+
+&prcm {
+	u-boot,dm-pre-reloc;
+};
+
+&gpio0_target {
+	u-boot,dm-pre-reloc;
+};
+
+&prcm_clocks {
+	compatible = "simple-bus";
+};
+
+&scm_clocks {
+	compatible = "simple-bus";
+};
diff --git a/configs/brppt1_mmc_defconfig b/configs/brppt1_mmc_defconfig
index b1ed2bcd68..716650aac9 100644
--- a/configs/brppt1_mmc_defconfig
+++ b/configs/brppt1_mmc_defconfig
@@ -90,7 +90,7 @@ CONFIG_NETCONSOLE=y
 CONFIG_DM=y
 CONFIG_SPL_DM=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
-# CONFIG_OF_TRANSLATE is not set
+CONFIG_SPL_OF_TRANSLATE=y
 CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_DM_I2C=y
 CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
-- 
2.37.2