[PATCH 2/3] clocksource: sh_mtu2: Document r7s72100 binding

[Simon Horman]

In general Renesas hardware is not documented to the extent
where the relationship between IP blocks on different SoCs can be assumed
although they may appear to operate the same way. Furthermore the
documentation typically does not specify a version for individual
IP blocks. For these reasons a convention of using the SoC name in place
of a version and providing SoC-specific compat strings has been adopted.

Although not universally liked this convention is used in the bindings
for the drivers a number of drivers for Renesas hardware. The purpose
of this patch is to update the Renesas R-Car Multi-Function Timer Pulse
Unit 2 (MTU2) driver to follow this convention.

Signed-off-by: Simon Horman <horms+renesas at verge.net.au>

---
* I plan to follow up with a patch patch to use the new binding in the
  dtsi files for the r7s72100 SoC.
---
 Documentation/devicetree/bindings/timer/renesas,mtu2.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/timer/renesas,mtu2.txt b/Documentation/devicetree/bindings/timer/renesas,mtu2.txt
index 917453f..ec4d334 100644
--- a/Documentation/devicetree/bindings/timer/renesas,mtu2.txt
+++ b/Documentation/devicetree/bindings/timer/renesas,mtu2.txt
@@ -8,7 +8,9 @@ are independent. The MTU2 hardware supports five channels indexed from 0 to 4.
 
 Required Properties:
 
-  - compatible: must contain "renesas,mtu2"
+  - compatible: must be one of the following.
+    - "renesas,mtu2" for generic MTU2
+    - "renesas,mtu2-r7s72100" for R7S72100 MTU2
 
   - reg: base address and length of the registers block for the timer module.
 
@@ -26,7 +28,7 @@ Required Properties:
 Example: R7S72100 (RZ/A1H) MTU2 node
 
 	mtu2: timer at fcff0000 {
-		compatible = "renesas,mtu2";
+		compatible = "renesas,mtu2-r7s72100", "renesas,mtu2";
 		reg = <0xfcff0000 0x400>;
 		interrupts = <0 139 IRQ_TYPE_LEVEL_HIGH>,
 			     <0 146 IRQ_TYPE_LEVEL_HIGH>,
-- 
2.0.1