4b2545dd19
Allow to extend expression of sub nodes to optionally indicate bit
position. This extension is needed to distinguish between different bit
positions in the same address.
For example, there are two nvmem nodes starting with bit 4 and bit 0
at the same address 0x54. In this case, it can be expressed as follows.
trim@54,4 {
reg = <0x54 1>;
bits = <4 2>;
};
trim@54,0 {
reg = <0x54 1>;
bits = <0 4>;
};
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1626661864-15473-2-git-send-email-hayashi.kunihiko@socionext.com
Signed-off-by: Rob Herring <robh@kernel.org>
104 lines
2.5 KiB
YAML
104 lines
2.5 KiB
YAML
# 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 <srinivas.kandagatla@linaro.org>
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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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maxItems: 1
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items:
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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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required:
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- 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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