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[68.111.223.48]) by smtp.gmail.com with ESMTPSA id s68sm5969712pgc.5.2017.05.04.13.05.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 May 2017 13:05:46 -0700 (PDT) From: Bjorn Andersson To: Andy Gross , Rob Herring , Mark Rutland , Ohad Ben-Cohen Cc: Jassi Brar , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org Subject: [PATCH v4 4/5] soc: qcom: Add device tree binding for GLINK RPM Date: Thu, 4 May 2017 13:05:38 -0700 Message-Id: <20170504200539.27027-4-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20170504200539.27027-1-bjorn.andersson@linaro.org> References: <20170504200539.27027-1-bjorn.andersson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add device tree binding documentation for the Qualcomm GLINK RPM, used for communication with the Resource Power Management subsystem in various Qualcomm SoCs. Signed-off-by: Bjorn Andersson --- Changes since v3: - Transition doorbell to mailbox framework Changes since v2: - Replace qcom,ipc syscon with a "doorbell" Changes since v1: - None .../devicetree/bindings/soc/qcom/qcom,glink.txt | 73 ++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt -- 2.12.0 diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt new file mode 100644 index 000000000000..e32198df0e9c --- /dev/null +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt @@ -0,0 +1,73 @@ +Qualcomm RPM GLINK binding + +This binding describes the Qualcomm RPM GLINK, a fifo based mechanism for +communication with the Resource Power Management system on various Qualcomm +platforms. + +- compatible: + Usage: required + Value type: + Definition: must be "qcom,glink-rpm" + +- interrupts: + Usage: required + Value type: + Definition: should specify the IRQ used by the remote processor to + signal this processor about communication related events + +- qcom,rpm-msg-ram: + Usage: required + Value type: + Definition: handle to RPM message memory resource + +- mboxes: + Usage: required + Value type: + Definition: reference to the "rpm_hlos" mailbox in APCS, as described + in mailbox/mailbox.txt + += GLINK DEVICES +Each subnode of the GLINK node represent function tied to a virtual +communication channel. The name of the nodes are not important. The properties +of these nodes are defined by the individual bindings for the specific function +- but must contain the following property: + +- qcom,glink-channels: + Usage: required + Value type: + Definition: a list of channels tied to this function, used for matching + the function to a set of virtual channels + += EXAMPLE +The following example represents the GLINK RPM node on a MSM8996 device, with +the function for the "rpm_request" channel defined, which is used for +regualtors and root clocks. + + apcs_glb: apcs-glb@9820000 { + compatible = "qcom,msm8996-apcs-hmss-global"; + reg = <0x9820000 0x1000>; + + #mbox-cells = <1>; + }; + + rpm_msg_ram: memory@68000 { + compatible = "qcom,rpm-msg-ram"; + reg = <0x68000 0x6000>; + }; + + rpm-glink { + compatible = "qcom,glink-rpm"; + + interrupts = ; + + qcom,rpm-msg-ram = <&rpm_msg_ram>; + + mboxes = <&apcs_glb 0>; + + rpm-requests { + compatible = "qcom,rpm-msm8996"; + qcom,glink-channels = "rpm_requests"; + + ... + }; + };