Re: [PATCH v4 1/3] Documentation: dt: net: add ath9k wireless device binding

[Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>]

On Sunday, July 10, 2016 1:28:32 AM CEST Martin Blumenstingl wrote:
> +- qca,check-eeprom-endianness: When enabled, the driver checks if the
> +                               endianness of the EEPROM (based on the two
> +                               magic bytes at the start of the EEPROM)
> +                               matches the host system's native endianness.
> +                               The data will be swapped accordingly if there
> +                               is a mismatch.
> +                               Leaving this disabled means that the EEPROM
> +                               data will be interpreted in the system's
> +                               native endianness, regardless of the magic
> +                               bytes.
> +                               Enable this option only when the magic bytes
> +                               are known to indicate the correct endianness
> +                               of the EEPROM data, because otherwise the
> +                               EEPROM data may be swapped and thus may be
> +                               parsed incorrectly.

Defining properties in terms of "native" endianess is usually not a good
idea, as some architectures (ARMv6+, PowerPC, ...) allow running either
big-endian or little-endian without changing the endianess of device
registers in the process.

It's better to document the property as defaulting to a specific endianess
unless you have an override or the autodetection flag, regardless of
the CPU endianess.

	Arnd
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