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dt-bindings: eeprom: at25: use "size" for FRAMs without device ID

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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>
This commit is contained in:
Markus Heidelberg 2025-08-15 11:58:36 +02:00 committed by Greg Kroah-Hartman
parent b009c1dbfc
commit 534c702c3c
1 changed files with 8 additions and 0 deletions
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8
Documentation/devicetree/bindings/eeprom/at25.yaml
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@ -56,6 +56,7 @@ properties:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Total eeprom size in bytes.
Also used for FRAMs without device ID where the size cannot be detected.
address-width:
$ref: /schemas/types.yaml#/definitions/uint32
@ -146,4 +147,11 @@ examples:
reg = <1>;
spi-max-frequency = <40000000>;
};
fram@2 {
compatible = "cypress,fm25", "atmel,at25";
reg = <2>;
spi-max-frequency = <20000000>;
size = <2048>;
};
};