arm: Add support for ST-Ericsson U8500 SoC
The NovaThor U8500 SoC was released by ST-Ericsson in 2011.
It was used for some development boards like the CALAO Systems
Snowball SBC, but mass production was primarily for Android
smartphones like the Samsung Galaxy S III mini.
Previous support for U8500 was removed in
commit 68282f55b846 ("arm: Remove unused ST-Ericsson u8500 arch")
since none of the boards were converted to generic boards
before the deadline.
The new code does not have much in common with the previous code.
I have completely rewritten everything, embracing the Driver Model
and device trees wherever possible.
The U8500 support is a bit more minimal for now - my primary
use case is to use U-Boot as alternative bootloader for some of the
U8500 Samsung smartphones. At the moment U-Boot is chain-loaded from
the original Samsung bootloader. A side effect of this is that we
can (temporarily) get away without implementing some functionality
- e.g. all clocks are already enabled by the original bootloader.
More functionality will be added in future patches.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: John Rigby <john.rigby@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/dts/ste-dbx5x0-u-boot.dtsi b/arch/arm/dts/ste-dbx5x0-u-boot.dtsi
new file mode 100644
index 0000000..4a99ee5
--- /dev/null
+++ b/arch/arm/dts/ste-dbx5x0-u-boot.dtsi
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "skeleton.dtsi"
+#include "ste-dbx5x0.dtsi"
+
+/ {
+ soc {
+ /* FIXME: Remove this when clk driver is implemented */
+ mtu@a03c6000 {
+ clock-frequency = <133000000>;
+ };
+ uart@80120000 {
+ clock = <38400000>;
+ };
+ uart@80121000 {
+ clock = <38400000>;
+ };
+ uart@80007000 {
+ clock = <38400000>;
+ };
+ };
+
+ reboot {
+ compatible = "syscon-reboot";
+ regmap = <&prcmu>;
+ offset = <0x228>; /* PRCM_APE_SOFTRST */
+ mask = <0x1>;
+ };
+};