[PATCH v2 3/3] doc: TPMI: Add debugfs documentation

Srinivas Pandruvada
2023-07-11T22:10:10Z

Describe fields in the TPMI debugfs folder.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
v2
New.

Documentation/ABI/testing/debugfs-tpmi | 31 ++++++++++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 32 insertions(+)
create mode 100644 Documentation/ABI/testing/debugfs-tpmi

diff --git a/Documentation/ABI/testing/debugfs-tpmi b/Documentation/ABI/testing/debugfs-tpmi
new file mode 100644
index 000000000000..9b530c1aaa2d
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-tpmi
@@ -0,0 +1,31 @@
+What: /sys/kernel/debug/tpmi-<n>/pfs_dump
+Date: December 2023
+KernelVersion: 6.6
+Contact: srinivas.pandruvada@linux.intel.com
+Description:
+The PFS (PM Feature Structure) table, shows details of each power
+management feature. This includes:
+tpmi_id, number of entries, entry size, offset, vsec offset, lock status
+and disabled status.
+Users: Debugging, any user space test suite
+
+What: /sys/kernel/debug/tpmi-<n>/tpmi-id-<n>/mem_dump
+Date: December 2023
+KernelVersion: 6.6
+Contact: srinivas.pandruvada@linux.intel.com
+Description:
+Shows the memory dump of the MMIO region for a TPMI ID.
+Users: Debugging, any user space test suite
+
+What: /sys/kernel/debug/tpmi-<n>/tpmi-id-<n>/mem_write
+Date: December 2023
+KernelVersion: 6.6
+Contact: srinivas.pandruvada@linux.intel.com
+Description:
+Allows to write at any offset. It doesn't check for Read/Write access
+as hardware will not allow to write at read-only memory. This write is
+at offset multiples of 4. The format is instance,offset,contents.
+Example:
+echo 0,0x20,0xff > mem_write
+echo 1,64,64 > mem_write
+Users: Debugging, any user space test suite
diff --git a/MAINTAINERS b/MAINTAINERS
index 5761b02183a7..4d439121fb36 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10720,6 +10720,7 @@ INTEL TPMI DRIVER
M: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
L: platform-driver-x86@vger.kernel.org
S: Maintained
+F: Documentation/ABI/testing/debugfs-tpmi
F: drivers/platform/x86/intel/tpmi.c
F: include/linux/intel_tpmi.h

--
2.40.1