[Skiboot] [PATCH] update device tree doc for NX node location

[Dan Streetman]

I think the device tree doc update for the new NX node location
got lost from the last patch; this updates the nx device node doc
with the right information.

Signed-off-by: Dan Streetman <ddstreet at ieee.org>
---
 doc/device-tree/nx.txt | 42 ++++++++++++++++++++----------------------
 1 file changed, 20 insertions(+), 22 deletions(-)

diff --git a/doc/device-tree/nx.txt b/doc/device-tree/nx.txt
index 6c48956..84c97ac 100644
--- a/doc/device-tree/nx.txt
+++ b/doc/device-tree/nx.txt
@@ -8,9 +8,25 @@ xscom node, as:
 /xscom@<xscom_addr>/nx@<nx_addr>
 
 With unique xscom and nx addresses.  Their compatible node contains
-"ibm,power-nx".  There is nothing that the OS should directly do with the
-NX nodes, instead the specific coprocessor nodes should be used, as
-described below.
+"ibm,power-nx".
+
+
+NX 842 Coprocessor
+------------------
+
+This is the memory compression coprocessor, which uses the IBM proprietary
+842 compression algorithm and format.  Each nx node contains an 842 engine.
+
+ibm,842-coprocessor-type	: CT value common to all 842 coprocessors
+ibm,842-coprocessor-instance	: CI value unique to all 842 coprocessors
+
+Access to the coprocessor requires using the ICSWX instruction, which uses
+a specific format including a Coprocessor Type (CT) and Coprocessor Instance
+(CI) value to address each request to the right coprocessor.  The driver should
+use the CT and CI values for a particular node to communicate with it.  For
+all 842 coprocessors in the system, the CT value will (should) be the same,
+while each will have a different CI value.  The driver can use CI 0 to allow
+the hardware to automatically select which coprocessor instance to use.
 
 
 NX RNG Coprocessor
@@ -18,7 +34,7 @@ NX RNG Coprocessor
 
 This is the Random Number Generator (RNG) coprocessor, which is a part
 of each NX coprocessor.  Each node represents a unique RNG coprocessor.
-The nodes are located at:
+Its nodes are not under the main nx node, they are located at:
 
 /hwrng@<addr>		: RNG at address <addr>
 ibm,chip-id		: chip id where the RNG is
@@ -27,21 +43,3 @@ reg			: address of the register to read from
 Each read from the RNG register will provide a new random number.
 
 
-NX 842 Coprocessor
-------------------
-
-This is the memory compression coprocessor, which uses the IBM proprietary
-842 compression algorithm and format.  Each node represents a unique 842
-coprocessor.  The nodes are located at:
-
-/ibm,nx842-powernv#<chip-id>	: 842 coprocessor on chip <chip-id>
-ibm,chip-id			: chip id where the 842 is
-ibm,coprocessor-type		: CT value common to all 842 coprocessors
-ibm,coprocessor-instance	: CI value unique to all 842 coprocessors
-
-Access to the coprocessor requires using the ICSWX instruction, which uses
-a specific format including a Coprocessor Type (CT) and Coprocessor Instance (CI)
-value to address each request to the right coprocessor.  The system should
-use the CT and CI values for a particular node to communicate with it.  For
-all 842 coprocessors in the system, the CT value will (should) be the same,
-while each will have a different CI value.
-- 
2.1.0