dt-bindings: arm: Extend SCMI to support new reset protocol

SCMIv2.0 adds a new Reset Management Protocol to manage various reset
states a given device or domain can enter. Extend the existing SCMI
bindings to add reset protocol support by re-using the reset bindings
for both reset providers and consumers.

Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt
index 317a2fc3667a91d51cd45a6162e96e2b014b90ed..083dbf96ee00c5324c0cdd877f3fd3f91ee169ec 100644 (file)
--- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
+++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt
@@ -73,6 +73,16 @@ Required properties:
                         as used by the firmware. Refer to  platform details
                         for your implementation for the IDs to use.
 
+Reset signal bindings for the reset domains based on SCMI Message Protocol
+------------------------------------------------------------
+
+This binding for the SCMI reset domain providers uses the generic reset
+signal binding[5].
+
+Required properties:
+ - #reset-cells : Should be 1. Contains the reset domain ID value used
+                 by SCMI commands.
+
 SRAM and Shared Memory for SCMI
 -------------------------------
 
@@ -93,6 +103,7 @@ Required sub-node properties:
 [2] Documentation/devicetree/bindings/power/power_domain.txt
 [3] Documentation/devicetree/bindings/thermal/thermal.txt
 [4] Documentation/devicetree/bindings/sram/sram.txt
+[5] Documentation/devicetree/bindings/reset/reset.txt
 
 Example:
 
@@ -152,6 +163,11 @@ firmware {
                        reg = <0x15>;
                        #thermal-sensor-cells = <1>;
                };
+
+               scmi_reset: protocol@16 {
+                       reg = <0x16>;
+                       #reset-cells = <1>;
+               };
        };
 };
 
@@ -166,6 +182,7 @@ hdlcd@7ff60000 {
        reg = <0 0x7ff60000 0 0x1000>;
        clocks = <&scmi_clk 4>;
        power-domains = <&scmi_devpd 1>;
+       resets = <&scmi_reset 10>;
 };
 
 thermal-zones {