diff options
author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2015-11-19 09:42:49 +0900 |
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committer | Rob Herring <robh@kernel.org> | 2015-12-09 15:29:37 -0600 |
commit | 22697acdd72d6749d603cb861d4f6c1c2b583c1b (patch) | |
tree | ab73830d9020f8c41971b38cb08a6eff374ec416 /Documentation/devicetree/bindings/sram/sram.txt | |
parent | 3d751eb057e6ed4e4fbce880c016ad967ba732d2 (diff) |
dt-bindings: Consolidate SRAM bindings from all vendors
SRAM bindings for various SoCs, using the mmio-sram genalloc
API, are spread over different places - per SoC vendor. Since all of
these are quite similar (they depend on mmio-sram) move them to a common
place.
Suggested-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Kukjin Kim <kgene@kernel.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/sram/sram.txt')
-rw-r--r-- | Documentation/devicetree/bindings/sram/sram.txt | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sram/sram.txt b/Documentation/devicetree/bindings/sram/sram.txt new file mode 100644 index 000000000000..42ee9438b771 --- /dev/null +++ b/Documentation/devicetree/bindings/sram/sram.txt @@ -0,0 +1,67 @@ +Generic on-chip SRAM + +Simple IO memory regions to be managed by the genalloc API. + +Required properties: + +- compatible : mmio-sram + +- 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 (@<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 <vendor>,[<device>-]<usage> +- pool : indicates that the particular reserved SRAM area is addressable + and in use by another device or devices +- export : indicates that the reserved SRAM area may be accessed outside + of the kernel, e.g. by bootloader or userspace +- label : the name for the reserved partition, if omitted, the label + is taken from the node name excluding the unit address. + +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>; + }; + + device-sram@1000 { + reg = <0x1000 0x1000>; + pool; + }; + + exported@20000 { + reg = <0x20000 0x20000>; + export; + }; +}; |