linux-kernel - Re: [PATCH v3 3/5] fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire

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Date:   Thu, 12 Jul 2018 21:45:08 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Joel Stanley <joel@....id.au>
Cc:     linux-aspeed@...ts.ozlabs.org,
        devicetree <devicetree@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Andrew Jeffery <andrew@...id.au>,
        Rob Herring <robh@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] fsi: master-ast-cf: Add new FSI master using
 Aspeed ColdFire

On Thu, 2018-07-12 at 17:53 +1000, Joel Stanley wrote:
> On 12 July 2018 at 13:48, Benjamin Herrenschmidt
> <benh@...nel.crashing.org> wrote:
> > The Aspeed AST2x00 can contain a ColdFire v1 coprocessor which
> > is currently unused on OpenPower systems.
> > 
> > This adds an alternative to the fsi-master-gpio driver that
> > uses that coprocessor instead of bit banging from the ARM
> > core itself. The end result is about 4 times faster.
> > 
> > The firmware for the coprocessor and its source code can be
> > found at https://github.com/ozbenh/cf-fsi and is system specific.
> > 
> > Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > ---
> >  drivers/fsi/Kconfig                      |    9 +
> >  drivers/fsi/Makefile                     |    1 +
> >  drivers/fsi/cf-fsi-fw.h                  |  157 +++
> >  drivers/fsi/fsi-master-ast-cf.c          | 1438 ++++++++++++++++++++++
> >  include/trace/events/fsi_master_ast_cf.h |  150 +++
> >  5 files changed, 1755 insertions(+)
> >  create mode 100644 drivers/fsi/cf-fsi-fw.h
> >  create mode 100644 drivers/fsi/fsi-master-ast-cf.c
> >  create mode 100644 include/trace/events/fsi_master_ast_cf.h
> > 
> > diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig
> > index 322cec393cf2..e0220d1e1357 100644
> > --- a/drivers/fsi/Kconfig
> > +++ b/drivers/fsi/Kconfig
> > @@ -27,6 +27,15 @@ config FSI_MASTER_HUB
> >         allow chaining of FSI links to an arbitrary depth.  This allows for
> >         a high target device fanout.
> > 
> > +config FSI_MASTER_AST_CF
> > +       tristate "FSI master based on Aspeed ColdFire coprocessor"
> > +       depends on GPIOLIB
> > +       depends on GPIO_ASPEED
> > +       ---help---
> > +       This option enables a FSI master using the AST2400 and AST2500 GPIO
> > +       lines driven by the internal ColdFire coprocessor. This requires
> > +       the corresponding machine specific ColdFire firmware to be available.
> 
> The "machine specific" part isn't true anymore, is it?

Right, I'll fixup the changelog before pushing if that's the last spin.

> I gave this a spin on a palmetto and it appeared to work fine for me.
> 
> Tested-by: Joel Stanley <joel@....id.au>

Thanks !

Cheers,
Ben
.