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This adds a list of valid SRAM sections compatibles for the A13, A20, A23 and H3 platforms. Per-platform compatibles are introduced for the SRAM sections of these platforms, with the A10 compatibles also listed as valid when applicable. In particular, compatibles for the C1 SRAM section are introduced. Other SRAMs (C2 and C3 in particular) are left out. They will be added we needed. Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> [Maxime: Added the A10 compatible as fallback, not alternatives] Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
100 lines
2.9 KiB
Plaintext
100 lines
2.9 KiB
Plaintext
Allwinnner SoC SRAM controllers
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-----------------------------------------------------
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The SRAM controller found on most Allwinner devices is represented by
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a regular node for the SRAM controller itself, with sub-nodes
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reprensenting the SRAM handled by the SRAM controller.
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Controller Node
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---------------
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Required properties:
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- compatible : should be:
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- "allwinner,sun4i-a10-sram-controller" (deprecated)
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- "allwinner,sun4i-a10-system-control"
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- "allwinner,sun5i-a13-system-control"
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- "allwinner,sun7i-a20-system-control", "allwinner,sun4i-a10-system-control"
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- "allwinner,sun8i-a23-system-control"
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- "allwinner,sun8i-h3-system-control"
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- "allwinner,sun50i-a64-sram-controller" (deprecated)
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- "allwinner,sun50i-a64-system-control"
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- reg : sram controller register offset + length
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SRAM nodes
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----------
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Each SRAM is described using the mmio-sram bindings documented in
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Documentation/devicetree/bindings/sram/sram.txt
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Each SRAM will have SRAM sections that are going to be handled by the
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SRAM controller as subnodes. These sections are represented following
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once again the representation described in the mmio-sram binding.
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The valid sections compatible for A10 are:
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- allwinner,sun4i-a10-sram-a3-a4
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- allwinner,sun4i-a10-sram-c1
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- allwinner,sun4i-a10-sram-d
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The valid sections compatible for A13 are:
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- allwinner,sun5i-a13-sram-a3-a4, allwinner,sun4i-a10-sram-a3-a4
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- allwinner,sun5i-a13-sram-c1, allwinner,sun4i-a10-sram-c1
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- allwinner,sun5i-a13-sram-d, allwinner,sun4i-a10-sram-d
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The valid sections compatible for A20 are:
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- allwinner,sun7i-a20-sram-a3-a4, allwinner,sun4i-a10-sram-a3-a4
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- allwinner,sun7i-a20-sram-c1, allwinner,sun4i-a10-sram-c1
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- allwinner,sun7i-a20-sram-d, allwinner,sun4i-a10-sram-d
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The valid sections compatible for A23/A33 are:
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- allwinner,sun8i-a23-sram-c1, allwinner,sun4i-a10-sram-c1
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The valid sections compatible for H3 are:
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- allwinner,sun8i-h3-sram-c1, allwinner,sun4i-a10-sram-c1
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The valid sections compatible for A64 are:
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- allwinner,sun50i-a64-sram-c
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Devices using SRAM sections
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---------------------------
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Some devices need to request to the SRAM controller to map an SRAM for
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their exclusive use.
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The relationship between such a device and an SRAM section is
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expressed through the allwinner,sram property, that will take a
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phandle and an argument.
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This valid values for this argument are:
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- 0: CPU
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- 1: Device
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Example
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-------
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system-control@1c00000 {
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compatible = "allwinner,sun4i-a10-system-control";
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reg = <0x01c00000 0x30>;
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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sram_a: sram@00000000 {
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compatible = "mmio-sram";
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reg = <0x00000000 0xc000>;
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#address-cells = <1>;
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#size-cells = <1>;
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ranges = <0 0x00000000 0xc000>;
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emac_sram: sram-section@8000 {
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compatible = "allwinner,sun4i-a10-sram-a3-a4";
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reg = <0x8000 0x4000>;
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};
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};
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};
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emac: ethernet@1c0b000 {
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compatible = "allwinner,sun4i-a10-emac";
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...
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allwinner,sram = <&emac_sram 1>;
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};
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