[U-Boot] [PATCH v5 0/2] i2c: sunxi: Support every i2c controller on each supported platform

[Paul Kocialkowski]

This version is ready for merging by the way.

I didn't use Kconfig after all, since all the Marvell boards are
including this through config.h and I didn't feel like moving it all to
Kconfig. Moreover, this doesn't use DM and apparently, only I2C drivers
that use DM are in Kconfig now.

Also, I don't think it makes sense to make twsi0 more privileged than
the other controllers. Users might just need to enable, say, controller
1, without enabling controller 0 on sunxi.

Le vendredi 10 avril 2015 à 23:09 +0200, Paul Kocialkowski a écrit :
> Changes since v4:
> * Got rid of Kconfig after all
> * Only build mvtwsi when at least one controller is enabled on sunxi
> * Controller 0 doesn't have to be enabled in particular
> 
> 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.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: This is a digitally signed message part
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20150414/7e4c8110/attachment.sig>