linux-kernel - Re: [PATCH 08/17] ARM: dts: dra7: Add dt node for the sycon pcie

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Message-ID: <20150624151931.87252315d0e61ddfd55c4724@ti.com>
Date:	Wed, 24 Jun 2015 15:19:31 +0300
From:	Roger Quadros <rogerq@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Kishon Vijay Abraham I <kishon@...com>, <bcousson@...libre.com>,
	<balbi@...com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <gregkh@...uxfoundation.org>,
	<nsekhar@...com>
Subject: Re: [PATCH 08/17] ARM: dts: dra7: Add dt node for the sycon pcie

On Wed, 24 Jun 2015 05:09:39 -0700
Tony Lindgren <tony@...mide.com> wrote:

> * Roger Quadros <rogerq@...com> [150624 04:58]:
> > On Wed, 24 Jun 2015 14:50:17 +0300
> > Roger Quadros <rogerq@...com> wrote:
> > 
> > > On Tue, 23 Jun 2015 17:28:53 +0530
> > > Kishon Vijay Abraham I <kishon@...com> wrote:
> > > 
> > > > Add new device tree node for the control module register space where
> > > > PCIe registers are present.
> > > > 
> > > > Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> > > > ---
> > > >  arch/arm/boot/dts/dra7.dtsi |    5 +++++
> > > >  1 file changed, 5 insertions(+)
> > > > 
> > > > diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> > > > index 260f300..3f434f7 100644
> > > > --- a/arch/arm/boot/dts/dra7.dtsi
> > > > +++ b/arch/arm/boot/dts/dra7.dtsi
> > > > @@ -291,6 +291,11 @@
> > > >  			reg = <0x4a002e00 0x7c>;
> > > >  		};
> > > >  
> > > > +		dra7_ctrl_pcie: tisyscon@...03c00 {
> > > > +			compatible = "syscon";
> > > > +			reg = <0x4a003c00 0x48>;
> > > > +		};
> > > > +
> > > 
> > > Why do you need to start from 0x4a003c00?
> > > CTRL_CORE_PCIESS1_PCS1 is at 0x4a003c24
> > 
> > Also, why can't this dra7_ctrl_pcie node be where scm_conf is.
> 
> Yes all the scm children should be under scm@...0 entry in the
> dra7.dtsi file.
> 
> And BTW, there's nothing stopping a driver doing of_ioremap
> on a larger range and be a child under scm@...0 in the dra7.dtsi
> if that range is dedicated to a single driver.

Agreed.

> 
> My take is we should only use regmap for the scm_conf area
> in general.

+1

should we get rid of dra7_ctrl_core and dra7_ctrl_general?
or move them to scm node?

cheers,
-roger
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