[PATCH 21/23] of: base: register optional OP-TEE overlay

[Ahmad Fatoum]

On 11/10/25 9:35 PM, Marco Felsch wrote:
> The BL32 OP-TEE binary can provide an overlay which contains all
> required configurations made by the secure-os, e.g. reserved-memory
> nodes, the firmware-interface (smc) and so on.
> 
> This overlay can be used to uniform the OP-TEE configuration handling
> for all OF platforms. While this patch is platform agnostic, the OP-TEE
> overlay supply handling still depends on platform specific integrations.
> Therefore only i.MX8MM/N/P platforms support this new feature yet.
> 
> However, prepare all ARMv8 platforms for the new loading mechanism.
> 
> Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>

Reviewed-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

> ---
>  arch/arm/mach-imx/imx9.c          | 2 +-
>  arch/arm/mach-rockchip/rockchip.c | 3 ++-
>  drivers/of/base.c                 | 3 +++
>  drivers/soc/imx/soc-imx8m.c       | 3 ++-
>  4 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/imx9.c b/arch/arm/mach-imx/imx9.c
> index dd4fbf099e601dda3c01a4e2d64a9552d2f616e5..7eccba4ed630c73b6b4fe266f742fe3d4ed63dd5 100644
> --- a/arch/arm/mach-imx/imx9.c
> +++ b/arch/arm/mach-imx/imx9.c
> @@ -173,7 +173,7 @@ int imx93_init(void)
>  	imx93_set_arm_clock();
>  	imx93_bootsource();
>  
> -	if (IS_ENABLED(CONFIG_PBL_OPTEE)) {
> +	if (IS_ENABLED(CONFIG_PBL_OPTEE) && !optee_overlay_applied()) {
>  		static struct of_optee_fixup_data optee_fixup_data = {
>  			.shm_size = OPTEE_SHM_SIZE,
>  			.method = "smc",
> diff --git a/arch/arm/mach-rockchip/rockchip.c b/arch/arm/mach-rockchip/rockchip.c
> index 0828f0fa72a9ad2495e012a42918c4b5431652e7..30cec0f0fe7cb651a1b157d5bb257fc67302422a 100644
> --- a/arch/arm/mach-rockchip/rockchip.c
> +++ b/arch/arm/mach-rockchip/rockchip.c
> @@ -33,7 +33,8 @@ static int rockchip_init(void)
>  {
>  	const struct optee_header *hdr = rk_scratch_get_optee_hdr();
>  
> -	if (IS_ENABLED(CONFIG_PBL_OPTEE) && optee_verify_header(hdr) == 0) {
> +	if (IS_ENABLED(CONFIG_PBL_OPTEE) && !optee_overlay_applied() &&
> +	    optee_verify_header(hdr) == 0) {
>  		static struct of_optee_fixup_data optee_fixup_data = {
>  			.shm_size = OPTEE_SHM_SIZE,
>  			.method = "smc",
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index c20fffb899a9c87910f424f5e4fd116f11cea546..203ebca1bf30cda5ce817a5d6b6eb437fc3befc6 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -22,6 +22,7 @@
>  #include <linux/clk.h>
>  #include <linux/ctype.h>
>  #include <linux/err.h>
> +#include <tee/optee.h>
>  
>  static struct device_node *root_node;
>  
> @@ -2129,6 +2130,8 @@ int barebox_register_fdt(const void *dtb)
>  		return PTR_ERR(root);
>  	}
>  
> +	optee_register_overlay();
> +
>  	return barebox_register_of(root);
>  }
>  
> diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
> index 3b83284fcbfd56d543cc300b8d42771202aa0bbb..ecc5f30df35dfd89a485a3f6883ab33fbafb897e 100644
> --- a/drivers/soc/imx/soc-imx8m.c
> +++ b/drivers/soc/imx/soc-imx8m.c
> @@ -207,7 +207,8 @@ static int imx8_soc_imx8m_init(struct soc_device_attribute *soc_dev_attr)
>  	imx_set_reset_reason(src + IMX7_SRC_SRSR, imx7_reset_reasons);
>  	pr_info("%s unique ID: %s\n", cputypestr, uid);
>  
> -	if (IS_ENABLED(CONFIG_PBL_OPTEE) && imx8m_tzc380_is_enabled()) {
> +	if (IS_ENABLED(CONFIG_PBL_OPTEE) && imx8m_tzc380_is_enabled() &&
> +	    !optee_overlay_applied()) {
>  		static struct of_optee_fixup_data optee_fixup_data = {
>  			.shm_size = OPTEE_SHM_SIZE,
>  			.method = "smc",
> 

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