spi_write_then_read with different tx/rx bits_per_word

spi_write_then_read with different tx/rx bits_per_word

[Philippe De Muyter]

Hello linux spi architects,

I am currently writing a driver for a peripheral that uses spi
for its configuration.  The spi interface of that device
presents a set of read-only or read-write registers with 7-bit
addresses, but 8- or 16-bit values.

Is there a convenience function similar to spi_write_then_read
to handle that case or must I roll my own one in my driver ?

Thanks in advance

Philippe De Muyter
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Re: spi_write_then_read with different tx/rx bits_per_word

[Mark Brown]

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On Wed, Jan 08, 2014 at 11:35:38PM +0100, Philippe De Muyter wrote:

> Is there a convenience function similar to spi_write_then_read
> to handle that case or must I roll my own one in my driver ?

Try regmap?

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Re: spi_write_then_read with different tx/rx bits_per_word

[Philippe De Muyter]

On Fri, Jan 10, 2014 at 10:27:45AM +0000, Mark Brown wrote:
> On Wed, Jan 08, 2014 at 11:35:38PM +0100, Philippe De Muyter wrote:
> 
> > Is there a convenience function similar to spi_write_then_read
> > to handle that case or must I roll my own one in my driver ?
> 
> Try regmap?

Thanks.

Actually it was late in the evening and I was confusing read in
`spi_write_then_read' with read as in 'read a register'.

`spi_write_then_read' should probably better be named `spi_xmit_then_rcv'

Best regards

Philippe

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Re: spi_write_then_read with different tx/rx bits_per_word

[Mark Brown]

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On Mon, Jan 13, 2014 at 02:35:18PM +0100, Philippe De Muyter wrote:
> On Fri, Jan 10, 2014 at 10:27:45AM +0000, Mark Brown wrote:
> > On Wed, Jan 08, 2014 at 11:35:38PM +0100, Philippe De Muyter wrote:

> > > Is there a convenience function similar to spi_write_then_read
> > > to handle that case or must I roll my own one in my driver ?

> > Try regmap?

> Thanks.

> Actually it was late in the evening and I was confusing read in
> `spi_write_then_read' with read as in 'read a register'.

> `spi_write_then_read' should probably better be named `spi_xmit_then_rcv'

Well, the main application of the function is actually to implement
register I/O.

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