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SubjectRe: [PATCH 1/3] spi: Add a spi_w8r16be() helper
On 09/27/2013 08:34 PM, Mark Brown wrote:
> On Fri, Sep 27, 2013 at 04:34:27PM +0200, Lars-Peter Clausen wrote:
>> This patch adds a new spi_w8r16be() helper, which is similar to spi_w8r16()
>> except that it converts the read data word from big endian to native endianness
>> before returning it. The reason for introducing this new helper is that for SPI
>
> This actually feels like a bug in spi_w8r16() - I'd expect it to be
> returning native endian in the first place since in SPI a word is by
> default big endian so I'd expect this to have more of a register I/O
> model. It certainly seems to match what almost all of the users are
> doing.

According to the documentation of spi_w8r16() it is a feature.

* The number is returned in wire-order, which is at least sometimes
* big-endian.

There seem to be at least two users though which assume that the result is
in native endianness drivers/hwmon/ads7871.c and drivers/mfd/stmpe-spi.c

>
> That said I'm not sure this is worth fixing in which case the new API
> makes sense. Or converting the users to regmap I guess.
>

regmap is always my first choice, but the users are all devices having
varying register sizes, so regmap is not working that nicely.

- Lars



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