[U-Boot] [linux-sunxi] [PATCH v2 0/4] sunxi: SPI: Add SUN6I generation SPI support

[Andre Przywara]

On Tue, 12 Feb 2019 16:15:22 +0530
Jagan Teki <jagan at amarulasolutions.com> wrote:

> On Tue, Feb 12, 2019 at 4:11 PM Andre Przywara <andre.przywara at arm.com> wrote:
> >
> > We already have a driver for the SPI devices in older Allwinner CPUs.
> > Newer SoCs (SUN6I generation) have a similar, but improved IP block.
> > This series adds support for that, so we can access the SPI flash that
> > some newer boards come with.
> > This series gathers some patches that have appeared on the list in one
> > form or another before (hence the v2 tag), but brings them all together
> > and updates them.
> >
> > The SUN4I/SUN6I SPI devices share a very similar architecure, but differ
> > annoyingly in quite some details, to a point where a shared driver
> > would look unnecessarily complicated. So we use an #ifdef based approach,
> > which keeps the driver simple, at the cost of not being able to access
> > both types of device in one binary build. But since there are no SoCs
> > which feature both types, this is a theoretical disadvantage.
> >
> > Patch 1/4 moves the clock toggling from the probe/remove to the
> > claim/release-bus stage.
> > Patch 2/4 adds the SPI gate clocks and reset gates to the clock drivers,
> > also describes at least the enable bit for the SPI mod clock. This is used
> > in patch 3/4, which uses the new DM clock framework in the driver, helping
> > to abstract differences between the SUN4I/SUN6I types.
> > Patch 4/4 eventually adds support for the new SUN6I generation SPI device.
> > The actual device support is determined at compile time, based on the
> > CONFIG_SUNXI_GEN_SUN6I symbol.
> >
> > What's left out of this series is the config bits needed to actually
> > activate the support for a board. At the moment this is unnecessarily
> > verbose, so that Oskari is looking at simplifying this at the Kconfig
> > level, which would complement this series.
> >
> > This has been briefly tested on the Pine64-LTS and the OrangePi PC2 board.
> > Please test them if you have other devices with a SUN6I SPI generation.  
> 
> I have new series for this which I sent two days back [1]. which uses
> same sun4i driver and implement enum reg set to avoid ifdef.
> 
> [1] https://patchwork.ozlabs.org/cover/1039178/

Ah, sorry, I missed that completely. Will have a look at this later on.

Cheers,
Andre.