linux-kernel - Re: [PATCH v4 2/6] arm: dts: socfpga: add altera fpga manager

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Date:	Thu, 11 Dec 2014 09:50:02 -0600
From:	atull <atull@...nsource.altera.com>
To:	Michal Simek <michal.simek@...inx.com>
CC:	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	<gregkh@...uxfoundation.org>, <jgunthorpe@...idianresearch.com>,
	<hpa@...or.com>, <monstr@...str.eu>, <rdunlap@...radead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<pantelis.antoniou@...sulko.com>, <robh+dt@...nel.org>,
	<grant.likely@...aro.org>, <iws@...o.caltech.edu>,
	<linux-doc@...r.kernel.org>, <pavel@...x.de>, <broonie@...nel.org>,
	<philip@...ister.org>, <rubini@...dd.com>, <jason@...edaemon.net>,
	<kyle.teske@...com>, <nico@...aro.org>, <balbi@...com>,
	<m.chehab@...sung.com>, <davidb@...eaurora.org>, <rob@...dley.net>,
	<davem@...emloft.net>, <cesarb@...arb.net>,
	<sameo@...ux.intel.com>, <akpm@...ux-foundation.org>,
	<linus.walleij@...aro.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <delicious.quinoa@...il.com>,
	<dinguyen@...nsource.altera.com>, <yvanderv@...nsource.altera.com>
Subject: Re: [PATCH v4 2/6] arm: dts: socfpga: add altera fpga manager

On Thu, 11 Dec 2014, Michal Simek wrote:

> On 12/10/2014 06:49 PM, Steffen Trumtrar wrote:
> > On Wed, Dec 10, 2014 at 11:25:59AM -0600, atull wrote:
> >> On Wed, 10 Dec 2014, Steffen Trumtrar wrote:
> >>
> >>> Hi!
> >>>
> >>> On Tue, Dec 09, 2014 at 02:14:46PM -0600, atull@...nsource.altera.com wrote:
> >>>> From: Alan Tull <atull@...nsource.altera.com>
> >>>>
> >>>> Add Altera FGPA manager to device tree.
> >>>>
> >>>> Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> >>>> ---
> >>>>  arch/arm/boot/dts/socfpga.dtsi |   10 ++++++++++
> >>>>  1 file changed, 10 insertions(+)
> >>>>
> >>>> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
> >>>> index 4472fd9..bab98b6 100644
> >>>> --- a/arch/arm/boot/dts/socfpga.dtsi
> >>>> +++ b/arch/arm/boot/dts/socfpga.dtsi
> >>>> @@ -751,5 +751,15 @@
> >>>>  			compatible = "altr,sys-mgr", "syscon";
> >>>>  			reg = <0xffd08000 0x4000>;
> >>>>  		};
> >>>> +
> >>>> +		hps_0_fpgamgr: fpgamgr@...f706000 {
> >>>> +			compatible = "altr,fpga-mgr", "simple-bus";
> >>>> +			reg = <0xFF706000 0x1000
> >>>> +			       0xFFB90000 0x1000>;
> >>>> +			interrupts = <0 175 4>;
> >>>> +			#address-cells = <1>;
> >>>> +			#size-cells = <1>;
> >>>> +			ranges;
> >>>> +		};
> >>>
> >>> The fpgamgr is NOT a bus. You don't need ranges and/or simple-bus.
> >>>
> >>> Regards,
> >>> Steffen
> >>
> >> Actually, I am going to be using this when I add the DT notification 
> >> stuff.  That stuff is waiting for DT overlays to show up in the main
> >> tree.
> >>
> >> So the choice it to either change this file now, once, or do the minimal 
> >> changes and have to change it again later.
> >>
> > 
> > Yes, that is what I thought. And still, devices can NOT show up
> > at the fpgamgr. They show up on the various bridges.
> > 
> > And as far as I understand the DT overlay stuff, you specify in
> > the overlay what the parent node will be.
> > For i2c this is one of the i2c-hosts, for spi one of the spi-hosts
> > and for IP cores in a bitstream one of the bridges.
> > 
> > The fpgamgr is, from my understanding, only responsible for writing
> > the bitstream to the FPGA; nothing more.
> 
> +1 on this.
> I think you can easily decide later where DT overlays will be added.
> 
> Thanks,
> Michal
> 
> 

OK guys, I'll simplify it down to the following in v5:

 +                hps_0_fpgamgr: fpgamgr@...f706000 {
 +                        compatible = "altr,fpga-mgr";
 +                        reg = <0xFF706000 0x1000
 +                               0xFFB90000 0x1000>;
 +                        interrupts = <0 175 4>;
 +                };

Alan
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