[PATCH 2/2] dt-bindings: remoteproc: Add documentation for SPSS remoteproc

[Rishabh Bhatnagar]

Add devicetree binding for Secure Subsystem remote processor
support in remoteproc framework. This describes all the resources
needed by SPSS to boot and handle crash and shutdown scenarios.

Signed-off-by: Rishabh Bhatnagar <rishabhb@xxxxxxxxxxxxxx>
---
 .../devicetree/bindings/remoteproc/qcom,spss.txt   | 114 +++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,spss.txt

diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,spss.txt b/Documentation/devicetree/bindings/remoteproc/qcom,spss.txt
new file mode 100644
index 0000000..79d6258
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,spss.txt
@@ -0,0 +1,114 @@
+Qualcomm SPSS Peripheral Image Loader
+
+This document defines the binding for a component that loads and boots firmware
+on the Qualcomm Secure Peripheral Processor. This processor is booted in the
+bootloader stage and it attaches itself to linux later on in the boot process.
+
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: must be one of:
+		    "qcom,sm8250-spss-pas"
+
+- reg:
+	Should contain an entry for each value in 'reg-names'. Each entry
+	have memory region's start address and size of the region.
+
+- reg-names:
+	Should contain strings with the following names each representing
+	a specific region in memory.
+	"sp2soc_irq_status", "sp2soc_irq_clr", "sp2soc_irq_mask", "rmb_err",
+	"rmb_err_spare2"
+
+- interrupts:
+	Should contain the generic interrupt assigned to remote processor.
+	The values should follow the interrupt-specifier format as dictated
+	by the 'interrupt-parent' node.
+
+- clocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: reference to the xo clock and optionally aggre2 clock to be
+		    held on behalf of the booting Hexagon core
+
+- clock-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "xo" and optionally include "aggre2"
+
+- cx-supply:
+	Usage: required
+	Value type: <phandle>
+	Definition: reference to the regulator to be held on behalf of the
+		    booting Hexagon core
+
+- px-supply:
+	Usage: required
+	Value type: <phandle>
+	Definition: reference to the px regulator to be held on behalf of the
+		    booting Hexagon core
+
+- memory-region:
+	Usage: required
+	Value type: <phandle>
+	Definition: reference to the reserved-memory for the SPSS
+
+- qcom,spss-scsr-bits:
+	Usage: required
+	Value type: <array>
+	Definition: Bits that are set by remote processor in the irq status
+		    register region to represent different states during
+		    boot process
+
+= SUBNODES
+The spss node may have an subnode named either "smd-edge" or "glink-edge" that
+describes the communication edge, channels and devices related to the SPSS.
+See ../soc/qcom/qcom,smd.txt and ../soc/qcom/qcom,glink.txt for details on how
+to describe these.
+
+= EXAMPLE
+The following example describes the resources needed to boot the
+Secure Processor, as it is found on SM8250 boards.
+
+	spss {
+		compatible = "qcom,sm8250-spss-pil";
+		reg = <0x188101c 0x4>,
+                      <0x1881024 0x4>,
+                      <0x1881028 0x4>,
+                      <0x188103c 0x4>,
+                      <0x1882014 0x4>;
+                reg-names = "sp2soc_irq_status", "sp2soc_irq_clr",
+                            "sp2soc_irq_mask", "rmb_err", "rmb_err_spare2";
+                interrupts = <0 352 1>;
+
+                cx-supply = <&VDD_CX_LEVEL>;
+                cx-uV-uA = <RPMH_REGULATOR_LEVEL_TURBO 100000>;
+                px-supply = <&VDD_MX_LEVEL>;
+                px-uV = <RPMH_REGULATOR_LEVEL_TURBO 100000>;
+
+                clocks = <&clock_rpmh RPMH_CXO_CLK>;
+                clock-names = "xo";
+                qcom,proxy-clock-names = "xo";
+                status = "ok";
+
+                memory-region = <&pil_spss_mem>;
+                qcom,spss-scsr-bits = <24 25>;
+
+                glink-edge {
+                        qcom,remote-pid = <8>;
+                        transport = "spss";
+                        mboxes = <&sp_scsr 0>;
+                        mbox-names = "spss_spss";
+                        interrupt-parent = <&intsp>;
+                        interrupts = <0 0 IRQ_TYPE_LEVEL_HIGH>;
+
+                        reg = <0x1885008 0x8>,
+                              <0x1885010 0x4>;
+                        reg-names = "qcom,spss-addr",
+                                    "qcom,spss-size";
+
+                        label = "spss";
+                        qcom,glink-label = "spss";
+                };
+	};
+
-- 
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