TEE-329-2: OP-TEE: Allow u-boot to add optee node in dtb

If OP-TEE is loaded by ATF, u-boot will add
optee device tree node in th edtb so that
Linux can loads OP-TEE driver.

Signed-off-by: Silvano di Ninno <silvano.dininno@nxp.com>
(cherry picked from commit 441c23698ffd5c90c6421113da55fae420072473)

1 files changed, 49 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
index d7eb03086b..55cc320c80 100644
--- a/arch/arm/mach-imx/imx8/cpu.c
+++ b/arch/arm/mach-imx/imx8/cpu.c
@@ -1300,6 +1300,54 @@ static int config_smmu_fdt(void *blob)
 #endif
 
 #ifdef CONFIG_OF_SYSTEM_SETUP
+static int ft_add_optee_node(void *fdt, bd_t *bd)
+{
+	const char *path, *subpath;
+	int offs;
+
+	/*
+	 * No TEE space allocated indicating no TEE running, so no
+	 * need to add optee node in dts
+	 */
+	if (!rom_pointer[1])
+		return 0;
+
+	offs = fdt_increase_size(fdt, 512);
+	if (offs) {
+		printf("No Space for dtb\n");
+		return 1;
+	}
+
+	path = "/firmware";
+	offs = fdt_path_offset(fdt, path);
+	if (offs < 0) {
+		path = "/";
+		offs = fdt_path_offset(fdt, path);
+
+		if (offs < 0) {
+			printf("Could not find root node.\n");
+			return 1;
+		}
+
+		subpath = "firmware";
+		offs = fdt_add_subnode(fdt, offs, subpath);
+		if (offs < 0) {
+			printf("Could not create %s node.\n", subpath);
+		}
+	}
+
+	subpath = "optee";
+	offs = fdt_add_subnode(fdt, offs, subpath);
+	if (offs < 0) {
+		printf("Could not create %s node.\n", subpath);
+	}
+
+	fdt_setprop_string(fdt, offs, "compatible", "linaro,optee-tz");
+	fdt_setprop_string(fdt, offs, "method", "smc");
+
+	return 0;
+}
+
 int ft_system_setup(void *blob, bd_t *bd)
 {
 #ifdef BOOTAUX_RESERVED_MEM_BASE
@@ -1320,6 +1368,7 @@ int ft_system_setup(void *blob, bd_t *bd)
 	config_smmu_fdt(blob);
 #endif
 
+	ft_add_optee_node(blob, bd);
 	return 0;
 }
 #endif