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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id z62sm23771572pfl.33.2019.01.21.21.51.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Jan 2019 21:51:49 -0800 (PST) From: Bjorn Andersson To: Andy Gross , David Brown , Sibi Sankar Cc: Rob Herring , Mark Rutland , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 04/10] dt-bindings: soc: qcom: Add AOSS QMP binding Date: Mon, 21 Jan 2019 21:51:06 -0800 Message-Id: <20190122055112.30943-5-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190122055112.30943-1-bjorn.andersson@linaro.org> References: <20190122055112.30943-1-bjorn.andersson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add binding for the QMP based side-channel communication mechanism to the AOSS, which is used to control resources not exposed through the RPMh interface. Reviewed-by: Rob Herring Reviewed-by: Stephen Boyd Signed-off-by: Bjorn Andersson --- Changes since v2: - Update indentation of example - Add colling device subnodes to the description .../bindings/soc/qcom/qcom,aoss-qmp.txt | 75 +++++++++++++++++++ include/dt-bindings/power/qcom-aoss-qmp.h | 15 ++++ 2 files changed, 90 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,aoss-qmp.txt create mode 100644 include/dt-bindings/power/qcom-aoss-qmp.h -- 2.18.0 diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,aoss-qmp.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,aoss-qmp.txt new file mode 100644 index 000000000000..881dc8c7907a --- /dev/null +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,aoss-qmp.txt @@ -0,0 +1,75 @@ +Qualcomm Always-On Subsystem side channel binding + +This binding describes the hardware component responsible for side channel +requests to the always-on subsystem (AOSS), used for certain power management +requests that is not handled by the standard RPMh interface. Each client in the +SoC has it's own block of message RAM and IRQ for communication with the AOSS. +The protocol used to communicate in the message RAM is known as QMP. + +The AOSS side channel exposes control over a set of resources, used to control +a set of debug related clocks and to affect the low power state of resources +related to the secondary subsystems. These resources are exposed as a set of +power-domains. + +- compatible: + Usage: required + Value type: + Definition: must be "qcom,sdm845-aoss-qmp" + +- reg: + Usage: required + Value type: + Definition: the base address and size of the message RAM for this + client's communication with the AOSS + +- interrupts: + Usage: required + Value type: + Definition: should specify the AOSS message IRQ for this client + +- mboxes: + Usage: required + Value type: + Definition: reference to the mailbox representing the outgoing doorbell + in APCS for this client, as described in mailbox/mailbox.txt + +- #power-domain-cells: + Usage: optional + Value type: + Definition: must be 1 + The provided power-domains are: + QDSS clock-domain (0), CDSP state (1), LPASS state (2), + modem state (3), SLPI state (4), SPSS state (5) and Venus + state (6). + += SUBNODES +The AOSS side channel also provides the controls for three cooling devices, +these are expressed as subnodes of the QMP node. The name of the node is used +to identify the resource and must therefor be "cx", "mx" or "ebi". + +- #cooling-cells: + Usage: optional + Value type: + Definition: must be 2 + += EXAMPLE + +The following example represents the AOSS side-channel message RAM and the +mechanism exposing the power-domains, as found in SDM845. + + aoss_qmp: qmp@c300000 { + compatible = "qcom,sdm845-aoss-qmp"; + reg = <0x0c300000 0x100000>; + interrupts = ; + mboxes = <&apss_shared 0>; + + #power-domain-cells = <1>; + + cx_cdev: cx { + #cooling-cells = <2>; + }; + + mx_cdev: mx { + #cooling-cells = <2>; + }; + }; diff --git a/include/dt-bindings/power/qcom-aoss-qmp.h b/include/dt-bindings/power/qcom-aoss-qmp.h new file mode 100644 index 000000000000..7d8ac1a4f90c --- /dev/null +++ b/include/dt-bindings/power/qcom-aoss-qmp.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2018, Linaro Ltd. */ + +#ifndef __DT_BINDINGS_POWER_QCOM_AOSS_QMP_H +#define __DT_BINDINGS_POWER_QCOM_AOSS_QMP_H + +#define AOSS_QMP_QDSS_CLK 0 +#define AOSS_QMP_LS_CDSP 1 +#define AOSS_QMP_LS_LPASS 2 +#define AOSS_QMP_LS_MODEM 3 +#define AOSS_QMP_LS_SLPI 4 +#define AOSS_QMP_LS_SPSS 5 +#define AOSS_QMP_LS_VENUS 6 + +#endif