[U-Boot] [PATCH V3] cmd_i2c: Provide option for bulk 'i2c write' in one transaction

[Masahiro Yamada]

Hi Simon,


On Tue, 3 Feb 2015 10:10:02 +0200
"Lubomir Popov" <lpopov at mm-sol.com> wrote:

> Hi Simon,
> 
> > Hi,
> >
> > On 30 January 2015 at 10:56, Lubomir Popov <lpopov at mm-sol.com> wrote:
> >> I2C chips do exist that require a write of some multi-byte data to occur in
> >> a single bus transaction (aka atomic transfer), otherwise either the write
> >> does not come into effect at all, or normal operation of internal circuitry
> >> cannot be guaranteed. The current implementation of the 'i2c write' command
> >> (transfer of multiple bytes from a memory buffer) in fact performs a separate
> >> transaction for each byte to be written and thus cannot support such types of
> >> I2C slave devices.
> >>
> >> This patch provides an alternative by allowing 'i2c write' to execute the
> >> write transfer of the given number of bytes in a single bus transaction if
> >> the '-s' option is specified as a final command argument. Else the current
> >> re-addressing method is used.
> >>
> >> Signed-off-by: Lubomir Popov <l-popov at ti.com>




Can we support "pagesize" property in Driver Model I2C?

The binding information is written in
Documentation/devicetree/bindings/eeprom.txt  of Linux Kernel.

If it is possible, it would help make the write access faster.
(Sorry, I have not taken a close look.)

Perhaps, it may also satisfy Lubomir's demand ??


Best Regards
Masahiro Yamada