Hi, Rob,

On Tue, 2019-05-07 at 12:41 -0500, Rob Herring wrote:

On Tue, May 07, 2019 at 04:13:46PM +0800, Bibby Hsieh wrote:

quoted

tcmdq driver provide a function that get the relationship
of sub system number from device node for client.
add specification for #subsys-cells, mediatek,gce-subsys.

Signed-off-by: Bibby Hsieh <redacted>
---
 .../devicetree/bindings/mailbox/mtk-gce.txt       | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
index 1f7f8f2a3f49..8fd9479bc9f6 100644
--- a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
+++ b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt

@@ -21,11 +21,19 @@ Required properties:
 	priority: Priority of GCE thread.
 	atomic_exec: GCE processing continuous packets of commands in atomic
 		way.
+- #subsys-cells: Should be 3.
+	<&phandle subsys_number start_offset size>
+	phandle: Label name of a gce node.
+	subsys_number: specify the sub-system id which is corresponding
+		       to the register address.
+	start_offset: the start offset of register address that GCE can access.
+	size: the total size of register address that GCE can access.

Like the #event-cells, do you need this if it isn't variable?

Yes, we need. Because the start_offset and size will be a fix number
when the chip was designed out.
Those two informations will help us to check if the same register
address was wrote by different user.
The checking mechanism is designing...

quoted

 
 Required properties for a client device:
 - mboxes: Client use mailbox to communicate with GCE, it should have this
   property and list of phandle, mailbox specifiers.
-- mediatek,gce-subsys: u32, specify the sub-system id which is corresponding
+Optional propertier for a client device:
+- mediatek,gce-client-reg: u32, specify the sub-system id which is corresponding
   to the register address.

This isn't a u32, but a phandle + 3 cells (or a list of those). How many 
entries can there be?

Ok, I will fix it.

quoted

 
 Some vaules of properties are defined in 'dt-bindings/gce/mt8173-gce.h'

@@ -40,6 +48,7 @@ Example:
 		clocks = <&infracfg CLK_INFRA_GCE>;
 		clock-names = "gce";
 		#mbox-cells = <3>;
+		#subsys-cells = <3>;
 	};
 
 Example for a client device:

@@ -48,9 +57,9 @@ Example for a client device:
 		compatible = "mediatek,mt8173-mmsys";
 		mboxes = <&gce 0 CMDQ_THR_PRIO_LOWEST 1>,
 			 <&gce 1 CMDQ_THR_PRIO_LOWEST 1>;
-		mediatek,gce-subsys = <SUBSYS_1400XXXX>;
 		mutex-event-eof = <CMDQ_EVENT_MUTEX0_STREAM_EOF
 				CMDQ_EVENT_MUTEX1_STREAM_EOF>;
-
+		mediatek,gce-client-reg = <&gce SUBSYS_1400XXXX 0x3000 0x1000>,
+					  <&gce SUBSYS_1401XXXX 0x2000 0x100>;
 		...
 	};

-- 
2.18.0

-- 
Bibby


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