commit 5af42bbf374907888c09d7aaf2cbf74d74c7707d
author Prithvi Pai <ppai@nvidia.com> Tue Feb 11 17:59:07 2025 +0530
committer Prithvi Pai <ppai@nvidia.com> Thu Mar 20 03:13:04 2025 +0000
tree b13e13920e8c0584275d539270a826b537f7823a
parent 550437d44948a424b1b93484c1e7664ee96e34cd

smbios-mdr: Add TPM Device Information

Type 43 of SMBIOS records defines the data structure to expose
TPM Device information. Add patch which displays the TPM Device
information on dbus.
Introduced `TPM_DBUS` meson option which will be disabled by default
When enabled, the TPM information is populated on DBUS.

Tested:

TPM information is available under dbus tree of smbios-mdr
```
:~# busctl tree xyz.openbmc_project.Smbios.MDR_V2
`- /xyz
  `- /xyz/openbmc_project
    |- /xyz/openbmc_project/Smbios
    | `- /xyz/openbmc_project/Smbios/MDR_V2
    |- /xyz/openbmc_project/inventory
    | `- /xyz/openbmc_project/inventory/system
    |   `- /xyz/openbmc_project/inventory/system/chassis
    |       |- /xyz/openbmc_project/inventory/system/chassis/motherboard/bios
    |       `- /xyz/openbmc_project/inventory/system/chassis/motherboard/tpm
```

Change-Id: Icd42f4f043bf5a970f4829e5d318568360fe4b59
Signed-off-by: Prithvi Pai <ppai@nvidia.com>

include/smbios_mdrv2.hpp

diff --git a/include/smbios_mdrv2.hpp b/include/smbios_mdrv2.hpp
index 59680bf..2be6dad 100644
--- a/include/smbios_mdrv2.hpp
+++ b/include/smbios_mdrv2.hpp
@@ -165,6 +165,8 @@
 
 static constexpr const char* systemSuffix = "/chassis/motherboard/bios";
 
+static constexpr const char* tpmSuffix = "/chassis/motherboard/tpm";
+
 constexpr std::array<SMBIOSVersion, 8> supportedSMBIOSVersions{
     SMBIOSVersion{3, 0}, SMBIOSVersion{3, 2}, SMBIOSVersion{3, 3},
     SMBIOSVersion{3, 4}, SMBIOSVersion{3, 5}, SMBIOSVersion{3, 6},
@@ -190,6 +192,7 @@
     systemEventLogType = 15,
     physicalMemoryArrayType = 16,
     memoryDeviceType = 17,
+    tpmDeviceType = 43,
 } SmbiosType;
 
 static constexpr uint8_t separateLen = 2;