remoteproc: dt: Provide bindings for ST's Remote Processor Controller driver

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/Documentation/devicetree/bindings/remoteproc/st-rproc.txt b/Documentation/devicetree/bindings/remoteproc/st-rproc.txt
new file mode 100644 (file)
index 0000000..1031bcd
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+++ b/Documentation/devicetree/bindings/remoteproc/st-rproc.txt
@@ -0,0 +1,41 @@
+STMicroelectronics Co-Processor Bindings
+----------------------------------------
+
+This binding provides support for adjunct processors found on ST SoCs.
+
+Co-processors can be controlled from the bootloader or the primary OS. If
+the bootloader starts a co-processor, the primary OS must detect its state
+and act accordingly.
+
+Required properties:
+- compatible           Should be one of:
+                               "st,st231-rproc"
+                               "st,st40-rproc"
+- memory-region                Reserved memory (See: ../reserved-memory/reserved-memory.txt)
+- resets               Reset lines (See: ../reset/reset.txt)
+- reset-names          Must be "sw_reset" and "pwr_reset"
+- clocks               Clock for co-processor (See: ../clock/clock-bindings.txt)
+- clock-frequency      Clock frequency to set co-processor at if the bootloader
+                       hasn't already done so
+- st,syscfg            System configuration register which holds the boot vector
+                       for the co-processor
+                               1st cell: Phandle to syscon block
+                               2nd cell: Boot vector register offset
+
+Example:
+
+       audio_reserved: rproc@42000000 {
+               compatible = "shared-dma-pool";
+               reg = <0x42000000 0x01000000>;
+               no-map;
+       };
+
+       st231-audio {
+               compatible      = "st,st231-rproc";
+               memory-region   = <&audio_reserved>;
+               resets          = <&softreset STIH407_ST231_AUD_SOFTRESET>;
+               reset-names     = "sw_reset";
+               clocks          = <&clk_s_c0_flexgen CLK_ST231_AUD_0>;
+               clock-frequency = <600000000>;
+               st,syscfg       = <&syscfg_core 0x228>;
+       };