From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752760AbcFFPyQ (ORCPT ); Mon, 6 Jun 2016 11:54:16 -0400 Received: from foss.arm.com ([217.140.101.70]:37402 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752528AbcFFPyL (ORCPT ); Mon, 6 Jun 2016 11:54:11 -0400 From: Sudeep Holla To: linux-kernel@vger.kernel.org Cc: Sudeep Holla , Jon Medhurst , Mathieu Poirier , Suzuki K Poulose , Rob Herring , Mark Rutland , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Subject: [PATCH 2/3] Documentation: add DT bindings for ARM SCPI power domains Date: Mon, 6 Jun 2016 16:53:58 +0100 Message-Id: <1465228439-13457-3-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1465228439-13457-1-git-send-email-sudeep.holla@arm.com> References: <1465228439-13457-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The System Control Processor (SCP) provides peripheral devices with power domains that can be enabled and disabled viathe System Control and Power Interface (SCPI) Message Protocol. Add bindings to allow probing of these device power domians. Cc: Rob Herring Cc: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org Cc: devicetree@vger.kernel.org Signed-off-by: Sudeep Holla --- Documentation/devicetree/bindings/arm/arm,scpi.txt | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/arm,scpi.txt b/Documentation/devicetree/bindings/arm/arm,scpi.txt index 313dabdc14f9..7141670d649b 100644 --- a/Documentation/devicetree/bindings/arm/arm,scpi.txt +++ b/Documentation/devicetree/bindings/arm/arm,scpi.txt @@ -87,10 +87,33 @@ SCPI provides an API to access the various sensors on the SoC. implementation for the IDs to use. For Juno R0 and Juno R1 refer to [3]. +Power domain bindings for the power domains based on SCPI Message Protocol +------------------------------------------------------------ + +This binding uses the generic power domain binding[4]. + +PM domain providers +=================== + +Required properties: + - #power-domain-cells : Should be 1. Contains the device or the power + domain ID value used by SCPI commands. + - num-domains: Total number of power domains provided by SCPI. This is + needed as the SCPI message protocol lacks a mechanism to + query this information runtime. + +PM domain consumers +=================== + +Required properties: + - power-domains : A phandle and PM domain specifier as defined by bindings of + the power controller specified by phandle. + [0] http://infocenter.arm.com/help/topic/com.arm.doc.dui0922b/index.html [1] Documentation/devicetree/bindings/clock/clock-bindings.txt [2] Documentation/devicetree/bindings/thermal/thermal.txt [3] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0922b/apas03s22.html +[4] Documentation/devicetree/bindings/power/power_domain.txt Example: @@ -144,6 +167,12 @@ scpi_protocol: scpi@2e000000 { compatible = "arm,scpi-sensors"; #thermal-sensor-cells = <1>; }; + + scpi_devpd: scpi-power-domains { + compatible = "arm,scpi-power-domains"; + num-domains = <2>; + #power-domain-cells = <1>; + }; }; cpu@0 { @@ -156,6 +185,7 @@ hdlcd@7ff60000 { ... reg = <0 0x7ff60000 0 0x1000>; clocks = <&scpi_clk 4>; + power-domains = <&scpi_devpd 1>; }; thermal-zones { @@ -186,3 +216,7 @@ The thermal-sensors property in the soc_thermal node uses the temperature sensor provided by SCP firmware to setup a thermal zone. The ID "3" is the sensor identifier for the temperature sensor as used by the firmware. + +The num-domains property in scpi-power-domains domain specifies that +SCPI provides 2 power domains. The hdlcd node uses the power domain with +domain ID 1. -- 2.7.4