From: Mathew McBride <matt@traverse.com.au>
Date: Thu, 12 Jun 2025 02:17:47 +0000 (+1000)
Subject: kernel: enable memory mapped TPM interface on armsr
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e5a70482b71076a06bca53647758cb5a69c3de6;p=thirdparty%2Fopenwrt.git

kernel: enable memory mapped TPM interface on armsr

The memory mapped TPM interface (TIS) can be used for
emulated or virtualized TPM instances with QEMU and
a simulation package like swtpm.

On QEMU the device will appear in the device tree
with a "tcg,tpm-tis-mmio" compatible.

For example:
qemu-system-aarch64 -machine virt -cpu max \
    -bios u-boot.bin \
    -nographic \
    .... \
    -hda openwrt-armsr-armv8-combined-efi.img \
    -chardev socket,id=chrtpm,path=/tmp/mytpm/swtpm-sock \
    -tpmdev emulator,id=tpm0,chardev=chrtpm \
    -device tpm-tis-device,tpmdev=tpm0

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Link: https://github.com/openwrt/openwrt/pull/19188
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---

diff --git a/package/kernel/linux/modules/other.mk b/package/kernel/linux/modules/other.mk
index b33a6241d91..94731a5af5f 100644
--- a/package/kernel/linux/modules/other.mk
+++ b/package/kernel/linux/modules/other.mk
@@ -968,7 +968,7 @@ $(eval $(call KernelPackage,tpm))
 define KernelPackage/tpm-tis
   SUBMENU:=$(OTHER_MENU)
   TITLE:=TPM TIS 1.2 Interface / TPM 2.0 FIFO Interface
-	DEPENDS:= @TARGET_x86 +kmod-tpm
+	DEPENDS:= @(TARGET_x86||TARGET_armsr) +kmod-tpm
   KCONFIG:= CONFIG_TCG_TIS
   FILES:= \
 	$(LINUX_DIR)/drivers/char/tpm/tpm_tis.ko \