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534c702c3c
Not all FRAM chips have a device ID and implement the corresponding read command. Thus the memory size, which is contained in the device ID, cannot be detected and has to be set manually as it is done for EEPROMs. Link: https://lore.kernel.org/all/20250401133148.38330-1-m.heidelberg@cab.de/ Signed-off-by: Markus Heidelberg <m.heidelberg@cab.de> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Link: https://lore.kernel.org/r/20250815095839.4219-2-m.heidelberg@cab.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
158 lines
4.0 KiB
YAML
158 lines
4.0 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/eeprom/at25.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: SPI EEPROMs or FRAMs compatible with Atmel's AT25
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maintainers:
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- Christian Eggers <ceggers@arri.de>
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properties:
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$nodename:
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anyOf:
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- pattern: "^eeprom@[0-9a-f]{1,2}$"
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- pattern: "^fram@[0-9a-f]{1,2}$"
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# There are multiple known vendors who manufacture EEPROM chips compatible
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# with Atmel's AT25. The compatible string requires two items where the
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# 'vendor' and 'model' parts of the first are the actual chip and the second
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# item is fixed to "atmel,at25". Some existing bindings only have the
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# "atmel,at25" part and should be fixed by somebody who knows vendor and
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# product.
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compatible:
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oneOf:
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- items:
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- enum:
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- anvo,anv32e61w
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- atmel,at25256B
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- fujitsu,mb85rs1mt
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- fujitsu,mb85rs256
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- fujitsu,mb85rs64
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- microchip,at25160bn
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- microchip,25lc040
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- st,m95m02
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- st,m95256
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- st,m95640
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- cypress,fm25
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- const: atmel,at25
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# Please don't use this alternative for new bindings.
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- items:
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- const: atmel,at25
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reg:
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maxItems: 1
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pagesize:
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
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description:
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Size of the eeprom page. FRAMs don't have pages.
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size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Total eeprom size in bytes.
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Also used for FRAMs without device ID where the size cannot be detected.
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address-width:
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 8, 9, 16, 24 ]
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description:
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Number of address bits.
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For 9 bits, the MSB of the address is sent as bit 3 of the instruction
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byte, before the address byte.
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spi-cpha: true
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spi-cpol: true
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read-only:
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description:
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Disable writes to the eeprom.
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type: boolean
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wp-gpios:
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maxItems: 1
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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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# Deprecated: at25,byte-len, at25,addr-mode, at25,page-size
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at25,byte-len:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Total eeprom size in bytes. Deprecated, use "size" property instead.
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deprecated: true
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at25,addr-mode:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Addr-mode flags, as defined in include/linux/spi/eeprom.h.
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Deprecated, use "address-width" property instead.
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deprecated: true
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at25,page-size:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Size of the eeprom page. Deprecated, use "pagesize" property instead.
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deprecated: true
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required:
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- compatible
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- reg
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- spi-max-frequency
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allOf:
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- $ref: /schemas/spi/spi-peripheral-props.yaml#
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- $ref: /schemas/nvmem/nvmem.yaml
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- if:
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properties:
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compatible:
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not:
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contains:
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const: cypress,fm25
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then:
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required:
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- pagesize
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- size
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- address-width
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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eeprom@0 {
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compatible = "st,m95256", "atmel,at25";
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reg = <0>;
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spi-max-frequency = <5000000>;
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spi-cpha;
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spi-cpol;
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wp-gpios = <&gpio1 3 0>;
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pagesize = <64>;
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size = <32768>;
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address-width = <16>;
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};
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fram@1 {
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compatible = "cypress,fm25", "atmel,at25";
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reg = <1>;
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spi-max-frequency = <40000000>;
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};
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fram@2 {
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compatible = "cypress,fm25", "atmel,at25";
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reg = <2>;
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spi-max-frequency = <20000000>;
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size = <2048>;
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};
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};
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