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-rw-r--r-- | Documentation/devicetree/bindings/nvmem/nvmem.txt | 80 |
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diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.txt b/Documentation/devicetree/bindings/nvmem/nvmem.txt new file mode 100644 index 000000000000..b52bc11e9597 --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/nvmem.txt @@ -0,0 +1,80 @@ += NVMEM(Non Volatile Memory) Data Device Tree Bindings = + +This binding is intended to represent the location of hardware +configuration data stored in NVMEMs like eeprom, efuses and so on. + +On a significant proportion of boards, the manufacturer has stored +some data on NVMEM, for the OS to be able to retrieve these information +and act upon it. Obviously, the OS has to know about where to retrieve +these data from, and where they are stored on the storage device. + +This document is here to document this. + += Data providers = +Contains bindings specific to provider drivers and data cells as children +of this node. + +Optional properties: + read-only: Mark the provider as read only. + += Data cells = +These are the child nodes of the provider which contain data cell +information like offset and size in nvmem provider. + +Required properties: +reg: specifies the offset in byte within the storage device. + +Optional properties: + +bits: Is pair of bit location and number of bits, which specifies offset + in bit and number of bits within the address range specified by reg property. + Offset takes values from 0-7. + +For example: + + /* Provider */ + qfprom: qfprom@00700000 { + ... + + /* Data cells */ + tsens_calibration: calib@404 { + reg = <0x404 0x10>; + }; + + tsens_calibration_bckp: calib_bckp@504 { + reg = <0x504 0x11>; + bits = <6 128> + }; + + pvs_version: pvs-version@6 { + reg = <0x6 0x2> + bits = <7 2> + }; + + speed_bin: speed-bin@c{ + reg = <0xc 0x1>; + bits = <2 3>; + + }; + ... + }; + += Data consumers = +Are device nodes which consume nvmem data cells/providers. + +Required-properties: +nvmem-cells: list of phandle to the nvmem data cells. +nvmem-cell-names: names for the each nvmem-cells specified. Required if + nvmem-cells is used. + +Optional-properties: +nvmem : list of phandles to nvmem providers. +nvmem-names: names for the each nvmem provider. required if nvmem is used. + +For example: + + tsens { + ... + nvmem-cells = <&tsens_calibration>; + nvmem-cell-names = "calibration"; + }; |