From 96328cdae38c491c69981fa0a6b448c2bc021065 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Heiko=20St=C3=BCbner?= Date: Wed, 26 Feb 2014 23:02:52 +0100 Subject: [PATCH] dt-bindings: sram: describe option to reserve parts of the memory Some SoCs need parts of their sram for special purposes. So while being part of the peripheral, it should not be part of the genpool controlling the sram. Therefore add the option to define reserved regions as subnodes of the sram-node similar to defining reserved global memory regions. Originally Suggested-by: Rob Herring Using subnodes for reserved regions Suggested-by: Grant Likely Signed-off-by: Heiko Stuebner Tested-by: Ulrich Prinz Acked-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman --- .../devicetree/bindings/misc/sram.txt | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/Documentation/devicetree/bindings/misc/sram.txt b/Documentation/devicetree/bindings/misc/sram.txt index 4d0a00e453a8..36cbe5aea990 100644 --- a/Documentation/devicetree/bindings/misc/sram.txt +++ b/Documentation/devicetree/bindings/misc/sram.txt @@ -8,9 +8,44 @@ Required properties: - reg : SRAM iomem address range +Reserving sram areas: +--------------------- + +Each child of the sram node specifies a region of reserved memory. Each +child node should use a 'reg' property to specify a specific range of +reserved memory. + +Following the generic-names recommended practice, node names should +reflect the purpose of the node. Unit address (@
) should be +appended to the name. + +Required properties in the sram node: + +- #address-cells, #size-cells : should use the same values as the root node +- ranges : standard definition, should translate from local addresses + within the sram to bus addresses + +Required properties in the area nodes: + +- reg : iomem address range, relative to the SRAM range + +Optional properties in the area nodes: + +- compatible : standard definition, should contain a vendor specific string + in the form ,[-] + Example: sram: sram@5c000000 { compatible = "mmio-sram"; reg = <0x5c000000 0x40000>; /* 256 KiB SRAM at address 0x5c000000 */ + + #adress-cells = <1>; + #size-cells = <1>; + ranges = <0 0x5c000000 0x40000>; + + smp-sram@100 { + compatible = "socvendor,smp-sram"; + reg = <0x100 0x50>; + }; }; -- 2.39.5