linux-kernel - [PATCH 3/5] dt-bindings: arm: Extend SCMI to support new reset protocol

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Date:   Fri, 26 Jul 2019 14:59:52 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Sudeep Holla <sudeep.holla@....com>, Peng Fan <peng.fan@....com>,
        linux-kernel@...r.kernel.org,
        Bo Zhang <bozhang.zhang@...adcom.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Volodymyr Babchuk <volodymyr_babchuk@...m.com>,
        Gaku Inami <gaku.inami.xh@...esas.com>,
        aidapala@....qualcomm.com, pajay@....qualcomm.com,
        Etienne Carriere <etienne.carriere@...aro.org>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>,
        wesleys@...inx.com, Felix Burton <fburton@...inx.com>,
        Saeed Nowshadi <saeed.nowshadi@...inx.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: [PATCH 3/5] 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 bothe reset providers and consumers.

Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: devicetree@...r.kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 .../devicetree/bindings/arm/arm,scmi.txt        | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt
index 317a2fc3667a..083dbf96ee00 100644
--- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
+++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt
@@ -73,6 +73,16 @@ SCMI provides an API to access the various sensors on the SoC.
 			 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 @@ Each sub-node represents the reserved area for SCMI.
 [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@...60000 {
 	reg = <0 0x7ff60000 0 0x1000>;
 	clocks = <&scmi_clk 4>;
 	power-domains = <&scmi_devpd 1>;
+	resets = <&scmi_reset 10>;
 };
 
 thermal-zones {
-- 
2.17.1