These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / soc / sunxi / sram.txt

diff --git a/kernel/Documentation/devicetree/bindings/soc/sunxi/sram.txt b/kernel/Documentation/devicetree/bindings/soc/sunxi/sram.txt
new file mode 100644 (file)
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+Allwinnner SoC SRAM controllers
+-----------------------------------------------------
+
+The SRAM controller found on most Allwinner devices is represented by
+a regular node for the SRAM controller itself, with sub-nodes
+reprensenting the SRAM handled by the SRAM controller.
+
+Controller Node
+---------------
+
+Required properties:
+- compatible : "allwinner,sun4i-a10-sram-controller"
+- reg : sram controller register offset + length
+
+SRAM nodes
+----------
+
+Each SRAM is described using the mmio-sram bindings documented in
+Documentation/devicetree/bindings/misc/sram.txt
+
+Each SRAM will have SRAM sections that are going to be handled by the
+SRAM controller as subnodes. These sections are represented following
+once again the representation described in the mmio-sram binding.
+
+The valid sections compatible are:
+    - allwinner,sun4i-a10-sram-a3-a4
+    - allwinner,sun4i-a10-sram-d
+
+Devices using SRAM sections
+---------------------------
+
+Some devices need to request to the SRAM controller to map an SRAM for
+their exclusive use.
+
+The relationship between such a device and an SRAM section is
+expressed through the allwinner,sram property, that will take a
+phandle and an argument.
+
+This valid values for this argument are:
+  - 0: CPU
+  - 1: Device
+
+Example
+-------
+sram-controller@01c00000 {
+       compatible = "allwinner,sun4i-a10-sram-controller";
+       reg = <0x01c00000 0x30>;
+       #address-cells = <1>;
+       #size-cells = <1>;
+       ranges;
+
+       sram_a: sram@00000000 {
+               compatible = "mmio-sram";
+               reg = <0x00000000 0xc000>;
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges = <0 0x00000000 0xc000>;
+
+               emac_sram: sram-section@8000 {
+                       compatible = "allwinner,sun4i-a10-sram-a3-a4";
+                       reg = <0x8000 0x4000>;
+                       status = "disabled";
+               };
+       };
+};
+
+emac: ethernet@01c0b000 {
+       compatible = "allwinner,sun4i-a10-emac";
+       ...
+
+       allwinner,sram = <&emac_sram 1>;
+};