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Subject[PATCH 03/18] dt-bindings: soc: qcom: add IPA bindings
Date
Add the binding definitions for the "qcom,ipa" device tree node.

Signed-off-by: Alex Elder <elder@linaro.org>
---
.../devicetree/bindings/net/qcom,ipa.txt | 164 ++++++++++++++++++
1 file changed, 164 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/qcom,ipa.txt

diff --git a/Documentation/devicetree/bindings/net/qcom,ipa.txt b/Documentation/devicetree/bindings/net/qcom,ipa.txt
new file mode 100644
index 000000000000..2705e198f12e
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/qcom,ipa.txt
@@ -0,0 +1,164 @@
+Qualcomm IP Accelerator (IPA)
+
+This binding describes the Qualcomm IPA. The IPA is capable of offloading
+certain network processing tasks (e.g. filtering, routing, and NAT) from
+the main processor.
+
+The IPA sits between multiple independent "execution environments,"
+including the Application Processor (AP) and the modem. The IPA presents
+a Generic Software Interface (GSI) to each execution environment.
+The GSI is an integral part of the IPA, but it is logically isolated
+and has a distinct interrupt and a separately-defined address space.
+
+ -------- ---------
+ | | | |
+ | AP +<---. .----+ Modem |
+ | +--. | | .->+ |
+ | | | | | | | |
+ -------- | | | | ---------
+ v | v |
+ --+-+---+-+--
+ | GSI |
+ |-----------|
+ | |
+ | IPA |
+ | |
+ -------------
+
+See also:
+ bindings/interrupt-controller/interrupts.txt
+ bindings/interconnect/interconnect.txt
+ bindings/soc/qcom/qcom,smp2p.txt
+ bindings/reserved-memory/reserved-memory.txt
+ bindings/clock/clock-bindings.txt
+
+All properties except "modem-init" defined below are required.
+
+- compatible:
+ Must be "qcom,sdm845-ipa".
+
+- modem-init:
+ This Boolean property is optional. If present, it indicates that
+ the modem is responsible for performing early IPA initialization,
+ including loading and validating firwmare used by the GSI. This
+ early initialization is performed by Trust Zone otherwise.
+
+- reg:
+ Resources specifying the physical address spaces of the IPA and GSI.
+
+- reg-names:
+ The names of the two address space ranges defined by the "reg"
+ property. Must be:
+ "ipa-reg"
+ "ipa-shared"
+ "gsi"
+
+- interrupts:
+ Specifies the IRQs used by the IPA. Four interrupts are required,
+ specifying: the IPA IRQ; the GSI IRQ; the clock query interrupt
+ from the modem; and the "ready for setup" interrupt from the modem.
+ The first two are hardware IRQs; the third and fourth are SMP2P
+ input interrupts.
+
+- interrupt-names:
+ The names of the interrupts defined by the "interrupts-extended"
+ property. Must be:
+ "ipa"
+ "gsi"
+ "ipa-clock-query"
+ "ipa-setup-ready"
+
+- clocks:
+ Resource that defines the IPA core clock.
+
+- clock-names:
+ The name used for the IPA core clock. Must be "core".
+
+- interconnects:
+ Specifies the interconnects used by the IPA. Three interconnects
+ are required, specifying: the path from the IPA to memory; from
+ IPA to internal (SoC resident) memory; and between the AP subsystem
+ and IPA for register access.
+
+- interconnect-names:
+ The names of the interconnects defined by the "interconnects"
+ property. Must be:
+ "memory"
+ "imem"
+ "config"
+
+- qcom,smem-states
+ The state bits used for SMP2P output. Two states must be specified.
+ The first indicates whether the value in the second bit is valid
+ (1 means valid). The second, if valid, defines whether the IPA
+ clock is enabled (1 means enabled).
+
+- qcom,smem-state-names
+ The names of the state bits used for SMP2P output. Must be:
+ "ipa-clock-enabled-valid"
+ "ipa-clock-enabled"
+
+- memory-region
+ A phandle for a reserved memory area that holds the firmware passed
+ to Trust Zone for authentication. (Note, this is required
+ only when Trust Zone performs early initialization; that is,
+ it is required if "modem-init" is not defined.)
+
+= EXAMPLE
+
+The following example represents the IPA present in the SDM845 SoC. It
+shows portions of the "modem-smp2p" node to indicate its relationship
+with the interrupts and SMEM states used by the IPA.
+
+ smp2p-mpss {
+ compatible = "qcom,smp2p";
+ . . .
+ ipa_smp2p_out: ipa-ap-to-modem {
+ qcom,entry-name = "ipa";
+ #qcom,smem-state-cells = <1>;
+ };
+
+ ipa_smp2p_in: ipa-modem-to-ap {
+ qcom,entry-name = "ipa";
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
+ };
+
+ ipa@1e40000 {
+ compatible = "qcom,sdm845-ipa";
+
+ modem-init;
+
+ reg = <0 0x1e40000 0 0x7000>,
+ <0 0x1e47000 0 0x2000>,
+ <0 0x1e04000 0 0x2c000>;
+ reg-names = "ipa-reg",
+ "ipa-shared";
+ "gsi";
+
+ interrupts-extended = <&intc 0 311 IRQ_TYPE_EDGE_RISING>,
+ <&intc 0 432 IRQ_TYPE_LEVEL_HIGH>,
+ <&ipa_smp2p_in 0 IRQ_TYPE_EDGE_RISING>,
+ <&ipa_smp2p_in 1 IRQ_TYPE_EDGE_RISING>;
+ interrupt-names = "ipa",
+ "gsi",
+ "ipa-clock-query",
+ "ipa-setup-ready";
+
+ clocks = <&rpmhcc RPMH_IPA_CLK>;
+ clock-names = "core";
+
+ interconnects =
+ <&rsc_hlos MASTER_IPA &rsc_hlos SLAVE_EBI1>,
+ <&rsc_hlos MASTER_IPA &rsc_hlos SLAVE_IMEM>,
+ <&rsc_hlos MASTER_APPSS_PROC &rsc_hlos SLAVE_IPA_CFG>;
+ interconnect-names = "memory",
+ "imem",
+ "config";
+
+ qcom,smem-states = <&ipa_smp2p_out 0>,
+ <&ipa_smp2p_out 1>;
+ qcom,smem-state-names = "ipa-clock-enabled-valid",
+ "ipa-clock-enabled";
+ };
--
2.20.1
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