From 72c10fef98fc3b3c924ee022e451872517e61ecf Mon Sep 17 00:00:00 2001 From: Bjorn Andersson Date: Mon, 27 Jul 2015 20:20:29 -0700 Subject: soc: qcom: Add device tree binding for Shared Memory Device Add device tree binding documentation for the Qualcomm Shared Memory Device, used for communication between the various CPUs in the Qualcomm SoCs. Signed-off-by: Bjorn Andersson Signed-off-by: Andy Gross --- .../devicetree/bindings/soc/qcom/qcom,smd.txt | 79 ++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt new file mode 100644 index 000000000000..f65c76db9859 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt @@ -0,0 +1,79 @@ +Qualcomm Shared Memory Driver (SMD) binding + +This binding describes the Qualcomm Shared Memory Driver, a fifo based +communication channel for sending data between the various subsystems in +Qualcomm platforms. + +- compatible: + Usage: required + Value type: + Definition: must be "qcom,smd" + += EDGES + +Each subnode of the SMD node represents a remote subsystem or a remote +processor of some sort - or in SMD language an "edge". The name of the edges +are not important. +The edge is described by the following properties: + +- interrupts: + Usage: required + Value type: + Definition: should specify the IRQ used by the remote processor to + signal this processor about communication related updates + +- qcom,ipc: + Usage: required + Value type: + Definition: three entries specifying the outgoing ipc bit used for + signaling the remote processor: + - phandle to a syscon node representing the apcs registers + - u32 representing offset to the register within the syscon + - u32 representing the ipc bit within the register + +- qcom,smd-edge: + Usage: required + Value type: + Definition: the identifier of the remote processor in the smd channel + allocation table + += SMD DEVICES + +In turn, subnodes of the "edges" represent devices tied to SMD channels on that +"edge". The names of the devices are not important. The properties of these +nodes are defined by the individual bindings for the SMD devices - but must +contain the following property: + +- qcom,smd-channels: + Usage: required + Value type: + Definition: a list of channels tied to this device, used for matching + the device to channels + += EXAMPLE + +The following example represents a smd node, with one edge representing the +"rpm" subsystem. For the "rpm" subsystem we have a device tied to the +"rpm_request" channel. + + apcs: syscon@f9011000 { + compatible = "syscon"; + reg = <0xf9011000 0x1000>; + }; + + smd { + compatible = "qcom,smd"; + + rpm { + interrupts = <0 168 1>; + qcom,ipc = <&apcs 8 0>; + qcom,smd-edge = <15>; + + rpm_requests { + compatible = "qcom,rpm-msm8974"; + qcom,smd-channels = "rpm_requests"; + + ... + }; + }; + }; -- cgit v1.2.3 From ba68227e610cec8e0bef7da7e04af3f479d9797d Mon Sep 17 00:00:00 2001 From: Bjorn Andersson Date: Mon, 27 Jul 2015 20:20:31 -0700 Subject: devicetree: soc: Add Qualcomm SMD based RPM DT binding Add binding documentation for the Qualcomm Resource Power Manager (RPM) using shared memory (Qualcomm SMD) as transport mechanism. This is found in 8974 and newer based devices. The binding currently describes the rpm itself and the regulator subnodes. Signed-off-by: Bjorn Andersson Signed-off-by: Andy Gross --- .../devicetree/bindings/soc/qcom,smd-rpm.txt | 117 +++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/qcom,smd-rpm.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/soc/qcom,smd-rpm.txt b/Documentation/devicetree/bindings/soc/qcom,smd-rpm.txt new file mode 100644 index 000000000000..e27f5c4c54fd --- /dev/null +++ b/Documentation/devicetree/bindings/soc/qcom,smd-rpm.txt @@ -0,0 +1,117 @@ +Qualcomm Resource Power Manager (RPM) over SMD + +This driver is used to interface with the Resource Power Manager (RPM) found in +various Qualcomm platforms. The RPM allows each component in the system to vote +for state of the system resources, such as clocks, regulators and bus +frequencies. + +- compatible: + Usage: required + Value type: + Definition: must be one of: + "qcom,rpm-msm8974" + +- qcom,smd-channels: + Usage: required + Value type: + Definition: Shared Memory channel used for communication with the RPM + += SUBDEVICES + +The RPM exposes resources to its subnodes. The below bindings specify the set +of valid subnodes that can operate on these resources. + +== Regulators + +Regulator nodes are identified by their compatible: + +- compatible: + Usage: required + Value type: + Definition: must be one of: + "qcom,rpm-pm8841-regulators" + "qcom,rpm-pm8941-regulators" + +- vdd_s1-supply: +- vdd_s2-supply: +- vdd_s3-supply: +- vdd_s4-supply: +- vdd_s5-supply: +- vdd_s6-supply: +- vdd_s7-supply: +- vdd_s8-supply: + Usage: optional (pm8841 only) + Value type: + Definition: reference to regulator supplying the input pin, as + described in the data sheet + +- vdd_s1-supply: +- vdd_s2-supply: +- vdd_s3-supply: +- vdd_l1_l3-supply: +- vdd_l2_lvs1_2_3-supply: +- vdd_l4_l11-supply: +- vdd_l5_l7-supply: +- vdd_l6_l12_l14_l15-supply: +- vdd_l8_l16_l18_l19-supply: +- vdd_l9_l10_l17_l22-supply: +- vdd_l13_l20_l23_l24-supply: +- vdd_l21-supply: +- vin_5vs-supply: + Usage: optional (pm8941 only) + Value type: + Definition: reference to regulator supplying the input pin, as + described in the data sheet + +The regulator node houses sub-nodes for each regulator within the device. Each +sub-node is identified using the node's name, with valid values listed for each +of the pmics below. + +pm8841: + s1, s2, s3, s4, s5, s6, s7, s8 + +pm8941: + s1, s2, s3, s4, l1, l2, l3, l4, l5, l6, l7, l8, l9, l10, l11, l12, l13, + l14, l15, l16, l17, l18, l19, l20, l21, l22, l23, l24, lvs1, lvs2, + lvs3, 5vs1, 5vs2 + +The content of each sub-node is defined by the standard binding for regulators - +see regulator.txt. + += EXAMPLE + + smd { + compatible = "qcom,smd"; + + rpm { + interrupts = <0 168 1>; + qcom,ipc = <&apcs 8 0>; + qcom,smd-edge = <15>; + + rpm_requests { + compatible = "qcom,rpm-msm8974"; + qcom,smd-channels = "rpm_requests"; + + pm8941-regulators { + compatible = "qcom,rpm-pm8941-regulators"; + vdd_l13_l20_l23_l24-supply = <&pm8941_boost>; + + pm8941_s3: s3 { + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; + }; + + pm8941_boost: s4 { + regulator-min-microvolt = <5000000>; + regulator-max-microvolt = <5000000>; + }; + + pm8941_l20: l20 { + regulator-min-microvolt = <2950000>; + regulator-max-microvolt = <2950000>; + }; + }; + }; + }; + }; + -- cgit v1.2.3 From 93dbed9121cc8e0fcc93edd9fca901322bdfbd1a Mon Sep 17 00:00:00 2001 From: Andy Gross Date: Wed, 26 Aug 2015 14:42:45 -0500 Subject: soc: qcom: smd: Use correct remote processor ID This patch fixes SMEM addressing issues when remote processors need to use secure SMEM partitions. Signed-off-by: Andy Gross Reviewed-by: Bjorn Andersson --- Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt index f65c76db9859..97d9b3e1bf39 100644 --- a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt @@ -37,6 +37,12 @@ The edge is described by the following properties: Definition: the identifier of the remote processor in the smd channel allocation table +- qcom,remote-pid: + Usage: optional + Value type: + Definition: the identifier for the remote processor as known by the rest + of the system. + = SMD DEVICES In turn, subnodes of the "edges" represent devices tied to SMD channels on that -- cgit v1.2.3