From: J Freyensee<james_p_freyensee@xxxxxxxxxxxxxxx>
This provides Kernel documentation for the PTI
feature for Linux mobile solutions.
Signed-off-by: J Freyensee<james_p_freyensee@xxxxxxxxxxxxxxx>
---
Documentation/pti/pti_intel_mid.txt | 89 +++++++++++++++++++++++++++++++++++
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create mode 100644 Documentation/pti/pti_intel_mid.txt
diff --git a/Documentation/pti/pti_intel_mid.txt b/Documentation/pti/pti_intel_mid.txt
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+The Intel MID PTI project is HW implemented in Intel Atom
+system-on-a-chip designs based on the Parallel Trace
+Interface for MIPI P1149.7 cJTAG standard. The kernel solution
+for this platform involves the following files:
+
+./include/linux/pti.h
+./include/linux/n_tracesink.h
+./drivers/.../n_tracerouter.c
+./drivers/.../n_tracesink.c
+./drivers/.../pti.c
+
+pti.c is the driver that enables various debugging features
+popular on certain mobile manufacturers. n_tracerouter.c
+and n_tracesink.c allow extra system information to be
+collected and routed to the pti driver, such as trace
+debugging data from a modem. Altough n_tracerouter
+and n_tracesink are a part of the complete PTI solution,
+these two line disciplines can work separate from
+pti.c and route any data stream from one /dev/tty node
+to another /dev/tty node via kernel-space. This provides
+a stable, reliable connection that will not break unless
+the user-space application shuts down (plus avoids
+kernel->user->kernel context switch overheads of routing
+data).