Hi Masahiro, On 3 February 2015 at 01:35, Masahiro Yamada <[email protected]> wrote: > Hi Simon, > > > On Tue, 3 Feb 2015 10:10:02 +0200 > "Lubomir Popov" <[email protected]> wrote: > >> Hi Simon, >> >> > Hi, >> > >> > On 30 January 2015 at 10:56, Lubomir Popov <[email protected]> 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 <[email protected]> > > > > > 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 ?? >
I think this is slightly different - some devices cannot support writes with more than one data value at a time - they require a separate address cycle before each data value. Regards, Simon _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
