dt-bindings: mailbox: Introduce Qualcomm APCS global binding

Introduce a binding for the Qualcomm APCS global block, exposing a
mailbox for invoking interrupts on remote processors in the system.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

diff --git a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
new file mode 100644 (file)
index 0000000..fb961c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
@@ -0,0 +1,46 @@
+Binding for the Qualcomm APCS global block
+==========================================
+
+This binding describes the APCS "global" block found in various Qualcomm
+platforms.
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: must be one of:
+                   "qcom,msm8916-apcs-kpss-global",
+                   "qcom,msm8996-apcs-hmss-global"
+
+- reg:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: must specify the base address and size of the global block
+
+- #mbox-cells:
+       Usage: required
+       Value type: <u32>
+       Definition: as described in mailbox.txt, must be 1
+
+
+= EXAMPLE
+The following example describes the APCS HMSS found in MSM8996 and part of the
+GLINK RPM referencing the "rpm_hlos" doorbell therein.
+
+       apcs_glb: mailbox@9820000 {
+               compatible = "qcom,msm8996-apcs-hmss-global";
+               reg = <0x9820000 0x1000>;
+
+               #mbox-cells = <1>;
+       };
+
+       rpm-glink {
+               compatible = "qcom,glink-rpm";
+
+               interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
+
+               qcom,rpm-msg-ram = <&rpm_msg_ram>;
+
+               mboxes = <&apcs_glb 0>;
+               mbox-names = "rpm_hlos";
+       };
+