doc: phytec: imx8mm: add OP-TEE documentation

Add instructions on how to build and package OP-TEE for the
phycore-imx8mm based boards. The build instructions are identical for
phyGATE-Tauri-L and phyBOARD-Polis.
Also fix missig '-' for TF-A build instructions.

Signed-off-by: Yannic Moog <y.moog@phytec.de>

board/phytec/phycore_imx8mm/MAINTAINERS

@@ -9,5 +9,6 @@ F:	configs/imx8mm-phygate-tauri-l_defconfig
 F:      configs/phycore-imx8mm_defconfig
 F:	doc/board/phytec/imx8mm-phygate-tauri-l.rst
 F:	doc/board/phytec/index.rst
+F:	doc/board/phytec/imx8mm-optee-build.rsti
 F:	doc/board/phytec/phycore_imx8mm.rst
 F:      include/configs/phycore_imx8mm.h

doc/board/phytec/imx8mm-optee-build.rsti

@@ -0,0 +1,14 @@
+Build the OP-TEE binary (optional)
+----------------------------------
+
+.. code-block:: bash
+
+   $ git clone https://github.com/OP-TEE/optee_os.git
+   $ cd optee_os
+   $ make CFG_TEE_BENCHMARK=n \
+     CROSS_COMPILE=aarch64-linux-gnu- \
+     O=out/arm \
+     PLATFORM=imx-mx8mmevk \
+     CFG_TZDRAM_START=0x56000000 \
+     CFG_DDR_SIZE=0x80000000 \
+     CFG_UART_BASE=UART3_BASE

doc/board/phytec/imx8mm-phygate-tauri-l.rst

@@ -9,6 +9,7 @@ Quick Start
 -----------
 
 - Build the ARM Trusted firmware binary
+- Build the OP-TEE binary (optional)
 - Get ddr firmware
 - Build U-Boot
 - Boot
@@ -20,10 +21,15 @@ Build the ARM Trusted firmware binary
 
    $ git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
    $ cd trusted-firmware-a
-   $ export CROSS_COMPILE=aarch64-linux-gnu
+   $ export CROSS_COMPILE=aarch64-linux-gnu-
    $ export IMX_BOOT_UART_BASE=0x30880000
+   $ # with optee
+   $ make PLAT=imx8mm BL32_BASE=0x56000000 SPD=opteed bl31
+   $ # without optee
    $ make PLAT=imx8mm bl31
 
+.. include:: imx8mm-optee-build.rsti
+
 Get the ddr firmware
 --------------------
 
@@ -42,6 +48,7 @@ Copy binaries
 .. code-block:: bash
 
    $ cp <TF-A dir>/build/imx8mm/release/bl31.bin .
+   $ cp <OP-TEE dir>/out/arm/core/tee-raw.bin tee.bin
    $ cp firmware-imx-8.23/firmware/ddr/synopsys/lpddr4*.bin .
 
 Build U-Boot

doc/board/phytec/phycore-imx8mm.rst

@@ -9,6 +9,7 @@ Quick Start
 -----------
 
 - Build the ARM Trusted firmware binary
+- Build the OP-TEE binary (optional)
 - Get ddr firmware
 - Build U-Boot
 - Boot
@@ -20,10 +21,15 @@ Build the ARM Trusted firmware binary
 
    $ git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
    $ cd trusted-firmware-a
-   $ export CROSS_COMPILE=aarch64-linux-gnu
+   $ export CROSS_COMPILE=aarch64-linux-gnu-
    $ export IMX_BOOT_UART_BASE=0x30880000
+   $ # with optee
+   $ make PLAT=imx8mm BL32_BASE=0x56000000 SPD=opteed bl31
+   $ # without optee
    $ make PLAT=imx8mm bl31
 
+.. include:: imx8mm-optee-build.rsti
+
 Get the ddr firmware
 --------------------