[U-Boot] [PATCH v4 0/3] i2c: sunxi: Support every i2c controller on each supported platform

[Paul Kocialkowski]

Actually, I'd prefer that you do not merge this since some ifdef logic
around controller 0 is still missing and mvtwsi code still assumes that
controller 0 will be defined. It may be the case that users wish to only
enable controller [1-4]. I think the Kconfig logic is also not necessary
and not a great addition to have since sunxi will be the sole user of it
(while other boards will keep using the option defined in the config
header). I'll work those issues out soon and provide a v5.

What do you think about all this?

Le mardi 07 avril 2015 à 22:19 +0200, Paul Kocialkowski a écrit :
> Changes since v3:
> * Kconfig support for MVTWSI
> * Only enable twsi0 by default for platforms that always use it for the AXP
> * Remove enabling other I2C busses by default on boards that expose them on pin
>   headers since those might be used for some other functionalities
> 
> Changes since v2:
> * I2C/TWI busses enable for Cubietruck as well
> 
> Changes since v1:
> * Kconfig option to enable I2C/TWI controllers 1-4 (when applicable)
> * Following patch to enable exposed busses on a few community-supported
>   single-board-computers
> 
> This series adds support for every i2c controller found on
> sun4i/sun5i/sun6i/sun7i/sun8i platforms and shouldn't break support for Marvell
> platforms (orion5x, kirkwood, armada xp) the driver was originally written for.
> 
> Regarding sunxi, I double-checked that this doesn't conflict with
> VIDEO_LCD_PANEL_I2C.
> 
> I would be interested in having this tested on sun8i (A23), since I changed TWI0
> muxing (to PH2-PH3 instead of PB0-PB1), according to the user manual and what
> is being done on the upstream Linux kernel. I2C was either not working before,
> or it was being muxed correctly by the bootrom, probably to communicate with the
> AXP, which luckily made it work in U-Boot too, since the I/O base address was
> already correct.
> 
> My use case here is that I'm writing a slave-side bitbang i2c implementation
> (with an Arduino) for a school project, using a Cubieboard2 as master and
> U-Boot as POC. However, only TWI1 was available through the expansion pins,
> hence the need for this series.
> 
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