[PATCH v2] arm: k3: Kconfig: Enable fTPM and RPMB support

[Andrew Davis]

On 2/25/26 5:24 AM, Shiva Tripathi wrote:
> Enable firmware TPM (fTPM) support via OP-TEE for K3 platforms with
> MMC hardware. This provides TPM 2.0 functionality through
> Microsoft's fTPM Trusted Application running in OP-TEE secure world,
> using eMMC RPMB as persistent storage.
> 
> fTPM support in U-Boot provides the foundation for measured boot
> and disk encryption use cases.
> 
> The ARM64 condition ensures these apply only to A53/A72 cores and the
> MMC condition ensures fTPM is enabled only on platforms with eMMC
> hardware support.
> 
> Signed-off-by: Shiva Tripathi <s-tripathi1 at ti.com>
> ---
> Changes in v2:
> - Moved fTPM enablement from per-board defconfig files to common Kconfig
> - Added configs to ARCH_K3 (arch/arm/Kconfig) to enable for all K3 platforms
> - Added command configs to TI_COMMON_CMD_OPTIONS (board/ti/common/Kconfig)
> - Added MMC dependency to address concern about boards without eMMC hardware
> - Link to v1: https://lore.kernel.org/all/20260223091314.586968-1-s-tripathi1@ti.com/
> 
> ---
>   arch/arm/Kconfig        | 3 +++
>   board/ti/common/Kconfig | 2 ++
>   2 files changed, 5 insertions(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 5508fce796a..eb83b5c35f1 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -834,6 +834,9 @@ config ARCH_K3
>   	imply DM_RNG if ARM64
>   	imply TEE if ARM64
>   	imply OPTEE if ARM64
> +	imply TPM if ARM64 && MMC
> +	imply TPM2_FTPM_TEE if ARM64 && MMC

Although maybe less-so, the fTPM can still be useful outside
of the secure storage bits that require eMMC/RPMB. Anyway,

Acked-by: Andrew Davis <afd at ti.com>

> +	imply SUPPORT_EMMC_RPMB if ARM64 && MMC
>   
>   config ARCH_OMAP2PLUS
>   	bool "TI OMAP2+"
> diff --git a/board/ti/common/Kconfig b/board/ti/common/Kconfig
> index 409454813f3..149909093b3 100644
> --- a/board/ti/common/Kconfig
> +++ b/board/ti/common/Kconfig
> @@ -61,4 +61,6 @@ config TI_COMMON_CMD_OPTIONS
>   	imply CMD_SPL
>   	imply CMD_TIME
>   	imply CMD_USB if USB
> +	imply CMD_TPM if TPM
> +	imply CMD_OPTEE_RPMB if OPTEE && SUPPORT_EMMC_RPMB
>