[PATCH 1/2] spi: bcm2835: add spi-bcm2835aux driver for the auxiliar spi1 and spi2

[Martin Sperl]

> On 14.07.2015, at 14:56, Stephen Warren <swarren at wwwdotorg.org> wrote:
> 
> I don't care so much about the internal code details; anything there can
> be trivially changed. But please do make sure the DT correctly
> represents the HW by:
> 
> * Having a separate DT node for each HW block (SPI controller, UART, and
> any shared interrupt mux/demux/controller/...)

That is what we have with the v3 patch:
* spi1
* spi2
* syscon controlling the aux-enable register
  (only used to enable/disable the hw block)

> * If e.g. the SPI controller driver is going to need to manipulate the
> "shared interrupt mux/demux/controller/...", there should be a phandle
> from the SPI controller node to the "shared interrupt
> mux/demux/controller/..." node, rather than listing the shared registers
> in each "client"'s reg property.
That is not what is in the v3 release of the patch any longer.

Each of the above dt-nodes has their own (non-overlapping) register
ranges and interrupts are enabled/disabled in the respective ranges
for spi1/spi2. Also the status register of spi1/2 contain the
corresponding flags for the reason of an interrupt - so no need
to access any of the shared aux registers for that - hence the use
of IRQF_SHARED.