ASoC: Intel: Add ASoC Intel SST Atom sysfs description

For ASoC Intel SST Atom based devices a sysfs entry is created
in order to track FW version. The FW version is useful in order to
check the different Version of LPE DSP FW across Intel SoCs.

Signed-off-by: Sebastien Guiriec <sebastien.guiriec@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-platform-sst-atom b/Documentation/ABI/testing/sysfs-platform-sst-atom
new file mode 100644 (file)
index 0000000..0d07c03
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-sst-atom
@@ -0,0 +1,17 @@
+What:          /sys/devices/platform/8086%x:00/firmware_version
+Date:          November 2016
+KernelVersion: 4.10
+Contact:       "Sebastien Guiriec" <sebastien.guiriec@intel.com>
+Description:
+               LPE Firmware version for SST driver on all atom
+               plaforms (BYT/CHT/Merrifield/BSW).
+               If the FW has never been loaded it will display:
+                       "FW not yet loaded"
+               If FW has been loaded it will display:
+                       "v01.aa.bb.cc"
+               aa: Major version is reflecting SoC version:
+                       0d: BYT FW
+                       0b: BSW FW
+                       07: Merrifield FW
+               bb: Minor version
+               cc: Build version