board: stm32mp1: reserve memory for OP-TEE in device tree

Add reserve memory for OP-TEE in U-Boot and in kernel device tree:
- no more reduce the DDR size in "memory" node:
  CONFIG_SYS_MEM_TOP_HIDE is no more used
- U-Boot device-tree defines the needed "reserved-memory" for OP-TEE
  and U-Boot should not use this reserved memory: board_get_usable_ram_top
  use lmb lib to found the first free region, the not reserved
  memory, enough to relocate U-Boot: the needed size of U-Boot
  is estimated with gd->mon_len + CONFIG_SYS_MALLOC_LEN.
- the optee node ("optee@...": firmware with compatible "linaro,optee-tz")
  and the associated "reserved-memory" are deactivated in kernel device
  tree when OP-TEE is not detected by U-Boot to prevent kernel issue
  (memory is reserved but not used, optee driver probe failed).

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/dts/stm32mp157c-ed1.dts b/arch/arm/dts/stm32mp157c-ed1.dts
index 54af7c97b3..05d5326405 100644
--- a/arch/arm/dts/stm32mp157c-ed1.dts
+++ b/arch/arm/dts/stm32mp157c-ed1.dts
@@ -70,6 +70,11 @@
 			reg = <0xe8000000 0x8000000>;
 			no-map;
 		};
+
+		optee@fe000000 {
+			reg = <0xfe000000 0x02000000>;
+			no-map;
+		};
 	};
 
 	aliases {
diff --git a/arch/arm/dts/stm32mp15xx-dkx.dtsi b/arch/arm/dts/stm32mp15xx-dkx.dtsi
index 42d3f0cb2d..9ce10a52f0 100644
--- a/arch/arm/dts/stm32mp15xx-dkx.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dkx.dtsi
@@ -58,6 +58,11 @@
 			reg = <0xd4000000 0x4000000>;
 			no-map;
 		};
+
+		optee@de000000 {
+			reg = <0xde000000 0x02000000>;
+			no-map;
+		};
 	};
 
 	led {