tpm: update PPI documentation to address the location change.

Updated Documentation/ABI/testing/sysfs-driver-ppi in order to explain
where PPI attributes are located and how backwards compatibility is
addressed.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>

1 files changed, 12 insertions, 7 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-ppi b/Documentation/ABI/testing/sysfs-driver-ppi
index 7d1435bc976c..9921ef285899 100644
--- a/Documentation/ABI/testing/sysfs-driver-ppi
+++ b/Documentation/ABI/testing/sysfs-driver-ppi
@@ -1,4 +1,4 @@
-What:           /sys/devices/pnp0/<bus-num>/ppi/
+What:           /sys/class/tpm/tpmX/ppi/
 Date:           August 2012
 Kernel Version: 3.6
 Contact:        xiaoyan.zhang@intel.com
@@ -8,9 +8,14 @@ Description:
                 folder makes sense. The folder path can be got by command
                 'find /sys/ -name 'pcrs''. For the detail information of PPI,
                 please refer to the PPI specification from
+
                 http://www.trustedcomputinggroup.org/
 
-What:           /sys/devices/pnp0/<bus-num>/ppi/version
+                In Linux 4.2 ppi was moved to the character device directory.
+                A symlink from tpmX/device/ppi to tpmX/ppi to provide backwards
+                compatibility.
+
+What:           /sys/class/tpm/tpmX/ppi/version
 Date:           August 2012
 Contact:        xiaoyan.zhang@intel.com
 Description:
@@ -18,7 +23,7 @@ Description:
                 platform.
                 This file is readonly.
 
-What:           /sys/devices/pnp0/<bus-num>/ppi/request
+What:           /sys/class/tpm/tpmX/ppi/request
 Date:           August 2012
 Contact:        xiaoyan.zhang@intel.com
 Description:
@@ -28,7 +33,7 @@ Description:
                 integer value range from 1 to 160, and 0 means no request.
                 This file can be read and written.
 
-What:           /sys/devices/pnp0/00:<bus-num>/ppi/response
+What:           /sys/class/tpm/tpmX/ppi/response
 Date:           August 2012
 Contact:        xiaoyan.zhang@intel.com
 Description:
@@ -37,7 +42,7 @@ Description:
                 : <response description>".
                 This file is readonly.
 
-What:           /sys/devices/pnp0/<bus-num>/ppi/transition_action
+What:           /sys/class/tpm/tpmX/ppi/transition_action
 Date:           August 2012
 Contact:        xiaoyan.zhang@intel.com
 Description:
@@ -47,7 +52,7 @@ Description:
                 description>".
                 This file is readonly.
 
-What:           /sys/devices/pnp0/<bus-num>/ppi/tcg_operations
+What:           /sys/class/tpm/tpmX/ppi/tcg_operations
 Date:           August 2012
 Contact:        xiaoyan.zhang@intel.com
 Description:
@@ -58,7 +63,7 @@ Description:
                 This attribute is only supported by PPI version 1.2+.
                 This file is readonly.
 
-What:           /sys/devices/pnp0/<bus-num>/ppi/vs_operations
+What:           /sys/class/tpm/tpmX/ppi/vs_operations
 Date:           August 2012
 Contact:        xiaoyan.zhang@intel.com
 Description: