[PATCH 02/12] SPEAr13xx: Move SPEAr1340 definitions to header file

[Arnd Bergmann]

On Thursday 16 January 2014, Pratyush Anand wrote:
> > Though we are almost ready with v2. But few concerns:
> > 
> > There are Spear soc common register used for misc configurations of clock, reset etc  for all ips.  Few of 
> > registers from the same area are also used for pcie/sata muxing and auxiliary clock configurations.
> > For example: sata_miphy_init in arch/arm/mach-spear/spear1340.c also uses these registers.
> > 
> > We have moved all these sata specific spear1340 configurations in a separate driver.  On the basis of spear-ahci dt 
> > Node this driver's probe is called, which further adds ahci platform driver.
> > We plan to put all spear1340/1310_pcie_miphy_init/exit functions of patch 9/12 of this series in
> > The same driver.
> > 
> > Now our concern is, what could be the best place to keep that driver, phy, reset or any other framework?
> > Or we keep this new driver in arch/arm/mach-spear only.
> 
> I think this misc configuration register block resource should be
> passed to syscon (drivers/mfd/syscon.c) driver.
> 
> regmap_update_bits should be used to update these registers and hence
> to configure pcie/sata settings.
> 
> As far as place is concerned, that can be kept into mfd and can be
> named as spear13xx-syscon.c
> 
> Whats your opinion arnd?

That sounds exactly like what I would have suggested, thanks!

One question remains, which is what driver should directly use 
syscon_regmap_lookup_by_phandle() to get the syscon registers themselves,
and which ones should use a higher-level abstraction from spear13xx-syscon.c.

We can decide this on a case-by-case basis, but in general I would suggest
to have drivers use syscon_regmap_lookup_by_phandle directly as long as
it doesn't cause significant code duplication between drivers.

	Arnd