93 lines · yaml
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/nvmem/nvmem.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: NVMEM (Non Volatile Memory)8 9maintainers:10 - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>11 12description: |13 This binding is intended to represent the location of hardware14 configuration data stored in NVMEMs like eeprom, efuses and so on.15 16 On a significant proportion of boards, the manufacturer has stored17 some data on NVMEM, for the OS to be able to retrieve these18 information and act upon it. Obviously, the OS has to know about19 where to retrieve these data from, and where they are stored on the20 storage device.21 22properties:23 "#address-cells":24 const: 125 26 "#size-cells":27 const: 128 29 read-only:30 $ref: /schemas/types.yaml#/definitions/flag31 description:32 Mark the provider as read only.33 34 wp-gpios:35 description:36 GPIO to which the write-protect pin of the chip is connected.37 The write-protect GPIO is asserted, when it's driven high38 (logical '1') to block the write operation. It's deasserted,39 when it's driven low (logical '0') to allow writing.40 maxItems: 141 42 nvmem-layout:43 $ref: /schemas/nvmem/layouts/nvmem-layout.yaml44 description:45 Alternative to the statically defined nvmem cells, this46 container may reference more advanced (dynamic) layout47 parsers.48 49additionalProperties: true50 51examples:52 - |53 #include <dt-bindings/gpio/gpio.h>54 55 qfprom: eeprom@700000 {56 compatible = "qcom,msm8974-qfprom", "qcom,qfprom";57 #address-cells = <1>;58 #size-cells = <1>;59 reg = <0x00700000 0x100000>;60 61 wp-gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>;62 63 /* ... */64 65 nvmem-layout {66 compatible = "fixed-layout";67 #address-cells = <1>;68 #size-cells = <1>;69 70 /* Data cells */71 tsens_calibration: calib@404 {72 reg = <0x404 0x10>;73 };74 75 tsens_calibration_bckp: calib_bckp@504 {76 reg = <0x504 0x11>;77 bits = <6 128>;78 };79 80 pvs_version: pvs-version@6 {81 reg = <0x6 0x2>;82 bits = <7 2>;83 };84 85 speed_bin: speed-bin@c{86 reg = <0xc 0x1>;87 bits = <2 3>;88 };89 };90 };91 92...93