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doc: TPMI: Add debugfs documentation

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Describe fields in the TPMI debugfs folder.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230712225950.171326-4-srinivas.pandruvada@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Srinivas Pandruvada 2023-07-12 15:59:50 -07:00 committed by Hans de Goede
parent b326c1bbb1
commit 40e6c3956b
2 changed files with 32 additions and 0 deletions
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31
Documentation/ABI/testing/debugfs-tpmi Normal file
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What: /sys/kernel/debug/tpmi-<n>/pfs_dump
Date: November 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: November 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: November 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

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MAINTAINERS
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@ -10732,6 +10732,7 @@ 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