Re: [PATCH RFC 2/2] mfd: add Renesas RPC-IF driver

[Lee Jones <lee.jones@xxxxxxxxxx>]

On Tue, 18 Jun 2019, Geert Uytterhoeven wrote:

> Hi Lee,
> 
> On Tue, Jun 18, 2019 at 11:57 AM Lee Jones <lee.jones@xxxxxxxxxx> wrote:
> > On Tue, 18 Jun 2019, Geert Uytterhoeven wrote:
> > > On Tue, Jun 18, 2019 at 11:20 AM Lee Jones <lee.jones@xxxxxxxxxx> wrote:
> > > > So is an RPC-IF a real hardware device.  Can you share the datasheet?
> > >
> > > Unfortunately the datasheet for the R-Car Gen3 and RZ/G2 SoCs is
> > > not yet public.
> >
> > When will it be public?
> 
> Dunno. RZ/G1 documentation became public a few months after the SoC
> release.
> 
> > Do you have access to it?
> 
> Yes I do.

Great.  Maybe you can help Sergei with his 'undocumented bits' issue.

> > > However, a very similar hardware block is present in the RZ/A2M SoC.
> > > Please see Chapter 20 ("SPI Multi I/O Bus Controller") of the "RZ/A2M Group
> > > User’s Manual: Hardware", which you can download from
> > > https://www.renesas.com/eu/en/products/microcontrollers-microprocessors/rz/rza/rza2m.html#documents
> >
> >   "The SPI multi I/O bus controller enables the direct connection of
> >    serial flash, OctaFlashTM, XccelaTM flash, or HyperFlashTM memory
> >    devices to this LSI chip.
> >
> >    This module allows the connected serial flash, OctaFlashTM, XccelaTM
> >    flash, or HyperFlashTM memory devices to be accessed by reading the
> >    external address space, or using Manual mode to transmit and receive
> >    data."
> >
> > Looks like a flash device to me.
> 
> The external address space is a small window.
> 
> > Can the SPI portion be used to connect generic SPI devices?
> 
> I'll defer that to the people who worked on the driver...

...

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
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