[PATCH v4 10/10] tools/arm: optee: create optee firmware node in DT if tee=native

[Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>]

From: Volodymyr Babchuk <vlad.babchuk@gmail.com>

If TEE support is enabled with "tee=native" option in xl.cfg,
then we need to inform guest about available TEE.

Currently only OP-TEE is supported, so we'll create DT
node in a way that is expected by optee driver in linux.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
---
 This patch depends on patches to optee.c.

 Changes from v3:
  - "smc" method replaced with "hvc"
  - Coding style fixes
---
 tools/libxl/libxl_arm.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
index 6930d0ab3b..9c342a3b0d 100644
--- a/tools/libxl/libxl_arm.c
+++ b/tools/libxl/libxl_arm.c
@@ -420,6 +420,32 @@ static int make_psci_node(libxl__gc *gc, void *fdt)
     return 0;
 }
 
+static int make_optee_node(libxl__gc *gc, void *fdt)
+{
+    int res;
+    LOG(DEBUG, "Creating OP-TEE node in dtb");
+
+    res = fdt_begin_node(fdt, "firmware");
+    if (res) return res;
+
+    res = fdt_begin_node(fdt, "optee");
+    if (res) return res;
+
+    res = fdt_property_compat(gc, fdt, 1, "linaro,optee-tz");
+    if (res) return res;
+
+    res = fdt_property_string(fdt, "method", "hvc");
+    if (res) return res;
+
+    res = fdt_end_node(fdt);
+    if (res) return res;
+
+    res = fdt_end_node(fdt);
+    if (res) return res;
+
+    return 0;
+}
+
 static int make_memory_nodes(libxl__gc *gc, void *fdt,
                              const struct xc_dom_image *dom)
 {
@@ -933,6 +959,9 @@ next_resize:
         if (info->arch_arm.vuart == LIBXL_VUART_TYPE_SBSA_UART)
             FDT( make_vpl011_uart_node(gc, fdt, ainfo, dom) );
 
+        if (info->arch_arm.tee == LIBXL_TEE_TYPE_NATIVE)
+            FDT( make_optee_node(gc, fdt) );
+
         if (pfdt)
             FDT( copy_partial_fdt(gc, fdt, pfdt) );
 
-- 
2.21.0

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