Am Freitag, 9. Dezember 2016, 11:54:02 CET schrieb Rob Herring:

On Thu, Dec 01, 2016 at 06:27:30PM -0800, Brian Norris wrote:

quoted

Gru is a base dev board for a family of devices, including Kevin. Both
utilize Rockchip RK3399, and they share much of their design.

Signed-off-by: Brian Norris <redacted>
---

 Documentation/devicetree/bindings/arm/rockchip.txt | 20
 ++++++++++++++++++++ 1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/rockchip.txt

b/Documentation/devicetree/bindings/arm/rockchip.txt index
cc4ace6397ab..830e13f5890c 100644

--- a/Documentation/devicetree/bindings/arm/rockchip.txt
+++ b/Documentation/devicetree/bindings/arm/rockchip.txt

@@ -99,6 +99,26 @@ Rockchip platforms device tree bindings

 		     "google,veyron-speedy-rev3", "google,veyron-speedy-rev2",
 		     "google,veyron-speedy", "google,veyron", "rockchip,rk3288";

+- Google Gru (dev-board):
+    Required root node properties:
+      - compatible = "google,gru-rev15", "google,gru-rev14",
+		     "google,gru-rev13", "google,gru-rev12",
+		     "google,gru-rev11", "google,gru-rev10",
+		     "google,gru-rev9", "google,gru-rev8",
+		     "google,gru-rev7", "google,gru-rev6",
+		     "google,gru-rev5", "google,gru-rev4",
+		     "google,gru-rev3", "google,gru-rev2",
+		     "google,gru", "rockchip,rk3399";

All of these are supposed to be specified or just one rev at a time?

All of them. I.e. the devicetree is supposed to be compatible with all of 
those, while the bootloader determines the actual board revision and sets the 
choosen compatible - at least that was the way with the previous series of 
devices based around the rk3288 (veyron) and I think it will be the same way 
still.

I.e. as you can see below, Kevin starts being compatible at -rev6, as 
(engineering) revisions before that probably had some differences on the 
board.

quoted

+
+- Google Kevin:
+    Required root node properties:
+      - compatible = "google,kevin-rev15", "google,kevin-rev14",
+		     "google,kevin-rev13", "google,kevin-rev12",
+		     "google,kevin-rev11", "google,kevin-rev10",
+		     "google,kevin-rev9", "google,kevin-rev8",
+		     "google,kevin-rev7", "google,kevin-rev6",
+		     "google,kevin", "google,gru", "rockchip,rk3399";
+

 - mqmaker MiQi:
     Required root node properties:
       - compatible = "mqmaker,miqi", "rockchip,rk3288";

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