[U-Boot] [PATCH v2] arm: dts: am33xx: introduce 'am33xx-u-boot.dtsi'

[Hannes Schmelzer]

commit fdce9d35dc36 ("arm: dts: am33xx: Sync dts with Linux 4.20.0")
did remove the "u-boot,dm-spl" flag from the 'ocp' bus which was
introduced with
commit 19aa4ac09db9 ("dts: am33xx: add u-boot, dm-spl to ocp bus")

Due to this all boards having CONFIG_SPL_OF_CONTROL enabled are broken
because they cannot bind/probe the boot-media interface during SPL
stage.

This commit introduces the 'am33xx-u-boot.dtsi' which is included with
the auto include mechanism. The am33xx-u-boot-dtsi adds the important
"u-boot,dm-pre-reloc" to the 'ocp bus' (the root bus of almost all
peripherals, at least the bootable ones).

The peripherials (mmc, spi, ...) needed during SPL stage need to be
equipped with the 'u-boot,dm-pre-reloc' in their responsible dts file.

Signed-off-by: Hannes Schmelzer <hannes.schmelzer at br-automation.com>

---

Changes in v2:
- use u-boot,dm-pre-reloc instead u-boot,dm-spl
- add am33xx-u-boot.dtsi instead modifying the am33xx.dtsi

 arch/arm/dts/am33xx-u-boot.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 arch/arm/dts/am33xx-u-boot.dtsi

diff --git a/arch/arm/dts/am33xx-u-boot.dtsi b/arch/arm/dts/am33xx-u-boot.dtsi
new file mode 100644
index 0000000..78f5e2c
--- /dev/null
+++ b/arch/arm/dts/am33xx-u-boot.dtsi
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 B&R Industrial Automation GmbH -
+ * https://www.br-automation.com/
+ */
+
+/ {
+	ocp {
+		u-boot,dm-pre-reloc;
+	};
+};
-- 
2.7.4