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99 lines
2.5 KiB
99 lines
2.5 KiB
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
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%YAML 1.2 |
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--- |
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$id: http://devicetree.org/schemas/nvmem/nvmem.yaml# |
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$schema: http://devicetree.org/meta-schemas/core.yaml# |
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title: NVMEM (Non Volatile Memory) Device Tree Bindings |
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maintainers: |
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- Srinivas Kandagatla <[email protected]> |
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description: | |
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This binding is intended to represent the location of hardware |
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configuration data stored in NVMEMs like eeprom, efuses and so on. |
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On a significant proportion of boards, the manufacturer has stored |
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some data on NVMEM, for the OS to be able to retrieve these |
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information and act upon it. Obviously, the OS has to know about |
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where to retrieve these data from, and where they are stored on the |
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storage device. |
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properties: |
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"#address-cells": |
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const: 1 |
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"#size-cells": |
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const: 1 |
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read-only: |
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$ref: /schemas/types.yaml#/definitions/flag |
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description: |
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Mark the provider as read only. |
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wp-gpios: |
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description: |
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GPIO to which the write-protect pin of the chip is connected. |
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The write-protect GPIO is asserted, when it's driven high |
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(logical '1') to block the write operation. It's deasserted, |
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when it's driven low (logical '0') to allow writing. |
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maxItems: 1 |
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patternProperties: |
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"@[0-9a-f]+(,[0-7])?$": |
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type: object |
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properties: |
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reg: |
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maxItems: 1 |
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description: |
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Offset and size in bytes within the storage device. |
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bits: |
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$ref: /schemas/types.yaml#/definitions/uint32-array |
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items: |
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- minimum: 0 |
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maximum: 7 |
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description: |
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Offset in bit within the address range specified by reg. |
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- minimum: 1 |
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description: |
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Size in bit within the address range specified by reg. |
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additionalProperties: true |
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examples: |
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- | |
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#include <dt-bindings/gpio/gpio.h> |
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qfprom: eeprom@700000 { |
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#address-cells = <1>; |
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#size-cells = <1>; |
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reg = <0x00700000 0x100000>; |
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wp-gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>; |
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/* ... */ |
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/* Data cells */ |
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tsens_calibration: calib@404 { |
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reg = <0x404 0x10>; |
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}; |
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tsens_calibration_bckp: calib_bckp@504 { |
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reg = <0x504 0x11>; |
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bits = <6 128>; |
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}; |
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pvs_version: pvs-version@6 { |
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reg = <0x6 0x2>; |
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bits = <7 2>; |
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}; |
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speed_bin: speed-bin@c{ |
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reg = <0xc 0x1>; |
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bits = <2 3>; |
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}; |
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}; |
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...
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