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Subject[RFC PATCH 01/12] dt-bindings: soc: qcom: add IPA bindings
Date
Add the binding definitions for the "qcom,ipa" and "qcom,rmnet-ipa"
device tree nodes.

Signed-off-by: Alex Elder <elder@linaro.org>
---
.../devicetree/bindings/soc/qcom/qcom,ipa.txt | 136 ++++++++++++++++++
.../bindings/soc/qcom/qcom,rmnet-ipa.txt | 15 ++
2 files changed, 151 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt
create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt

diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt
new file mode 100644
index 000000000000..d4d3d37df029
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,ipa.txt
@@ -0,0 +1,136 @@
+Qualcomm IPA (IP Accelerator) Driver
+
+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 currently serves only as a network interface,
+providing access to an LTE network available via a modem.
+
+The IPA sits between multiple independent "execution environments,"
+including the AP subsystem (APSS) 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.
+
+ ---------- ------------- ---------
+ | | |G| |G| | |
+ | APSS |===|S| IPA |S|===| Modem |
+ | | |I| |I| | |
+ ---------- ------------- ---------
+
+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 defined below are required.
+
+- compatible:
+ Must be one of the following compatible strings:
+ "qcom,ipa-sdm845-modem_init"
+ "qcom,ipa-sdm845-tz_init"
+
+-reg:
+ Resources specyfing the physical address spaces of the IPA and GSI.
+
+-reg-names:
+ The names of the address space ranges defined by the "reg" property.
+ Must be "ipa" and "gsi".
+
+- interrupts-extended:
+ Specifies the IRQs used by the IPA. Four cells are required,
+ specifying: the IPA IRQ; the GSI IRQ; the clock query interrupt
+ from the modem; and the "ready for stage 2 initialization"
+ 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", and
+ "ipa-post-init".
+
+- 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 cells 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", and "config".
+
+- qcom,smem-states
+ The state bits used for SMP2P output. Two cells 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. These must be
+ "ipa-clock-enabled-valid" and "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 for "qcom,ipa-sdm845-tz_init".)
+
+= 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.
+
+ modem-smp2p {
+ 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@1e00000 {
+ compatible = "qcom,ipa-sdm845-modem_init";
+
+ reg = <0x1e40000 0x34000>,
+ <0x1e04000 0x2c000>;
+ reg-names = "ipa",
+ "gsi";
+
+ interrupts-extended = <&intc 0 311 IRQ_TYPE_LEVEL_HIGH>,
+ <&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-post-init";
+
+ clocks = <&rpmhcc RPMH_IPA_CLK>;
+ clock-names = "core";
+
+ interconnects = <&qnoc MASTER_IPA &qnoc SLAVE_EBI1>,
+ <&qnoc MASTER_IPA &qnoc SLAVE_IMEM>,
+ <&qnoc MASTER_APPSS_PROC &qnoc 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";
+ };
diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt
new file mode 100644
index 000000000000..3d0b2aabefc7
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,rmnet-ipa.txt
@@ -0,0 +1,15 @@
+Qualcomm IPA RMNet Driver
+
+This binding describes the IPA RMNet driver, which is used to
+represent virtual interfaces available on the modem accessed via
+the IPA. Other than the compatible string there are no properties
+associated with this device.
+
+- compatible:
+ Must be "qcom,rmnet-ipa".
+
+= EXAMPLE
+
+ qcom,rmnet-ipa {
+ compatible = "qcom,rmnet-ipa";
+ };
--
2.17.1
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