linux-kernel - [PATCH 3/4] Documentation: dt: Add bindings for Davinci DSP processors

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Date:   Fri, 26 May 2017 15:21:39 -0500
From:   Suman Anna <s-anna@...com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Mark Rutland <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        Robert Tivy <rtivy@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Suman Anna <s-anna@...com>
Subject: [PATCH 3/4] Documentation: dt: Add bindings for Davinci DSP processors

Add the device tree bindings document for the DSP processor
subsystem devices on TI Davinci DA8xx/OMAP-L13x SoCs.

Signed-off-by: Suman Anna <s-anna@...com>
---
 .../bindings/remoteproc/ti,davinci-rproc.txt       | 92 ++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,davinci-rproc.txt

diff --git a/Documentation/devicetree/bindings/remoteproc/ti,davinci-rproc.txt b/Documentation/devicetree/bindings/remoteproc/ti,davinci-rproc.txt
new file mode 100644
index 000000000000..e53572e22002
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/ti,davinci-rproc.txt
@@ -0,0 +1,92 @@
+TI Davinci DSP devices
+=======================
+
+Binding status: Unstable - Subject to changes for DT clocks and resets
+
+The TI Davinci family of SoCs usually contains a TI DSP Core sub-system that
+is used to offload some of the processor-intensive tasks or algorithms, for
+achieving various system level goals.
+
+The processor cores in the sub-system usually contain additional sub-modules
+like L1 and/or L2 caches/SRAMs, an Interrupt Controller, an external memory
+controller, a dedicated local power/sleep controller etc. The DSP processor
+core used in Davinci SoCs is usually a C674x DSP CPU.
+
+DSP Device Node:
+================
+Each DSP Core sub-system is represented as a single DT node.
+
+Required properties:
+--------------------
+The following are the mandatory properties:
+
+- compatible:		Should be one of the following,
+			    "ti,da850-dsp" for DSPs on OMAP-L138 SoCs
+
+- reg:			Should contain an entry for each value in 'reg-names'.
+			Each entry should have the memory region's start address
+			and the size of the region, the representation matching
+			the parent node's '#address-cells' and '#size-cells' values.
+
+- reg-names:		Should contain strings with the following names, each
+			representing a specific internal memory region or a
+			specific register space,
+			     "l2sram", "l1pram", "l1dram", "host1cfg", "chipsig_base"
+
+- interrupts: 		Should contain the interrupt number used to receive the
+			interrupts from the DSP. The value should follow the
+			interrupt-specifier format as dictated by the
+			'interrupt-parent' node.
+
+- memory-region:	phandle to the reserved memory node to be associated
+			with the remoteproc device. The reserved memory node
+			can be a CMA memory node, and should be defined as
+			per the bindings in
+			Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
+
+Optional properties:
+--------------------
+- interrupt-parent:	phandle to the interrupt controller node. This property
+			is needed if the device node hierarchy doesn't have an
+			interrupt controller.
+
+
+Example:
+--------
+
+	/* DA850 DTS file */
+	{
+		dsp: dsp@...00000 {
+			compatible = "ti,da850-dsp";
+			reg = <0x11800000 0x40000>,
+			      <0x11e00000 0x8000>,
+			      <0x11f00000 0x8000>,
+			      <0x01c14044 0x4>,
+			      <0x01c14174 0x8>;
+			reg-names = "l2sram", "l1pram", "l1dram", "host1cfg",
+				    "chipsig";
+			interrupt-parent = <&intc>;
+			interrupts = <28>;
+			status = "disabled";
+		};
+
+	};
+
+	/* OMAP-L138 LCDK Board file */
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		dsp_cma_pool: dsp_cma@...00000 {
+                        compatible = "shared-dma-pool";
+                        reg = <0xc3000000 0x1000000>;
+                        reusable;
+                        status = "okay";
+                };
+	};
+
+	&dsp {
+		status = "okay";
+		memory-region = <&dsp_cma_pool>;
+	};
-- 
2.12.0