linux-kernel - Re: [PATCH 2/2] ARM: dts: r8a7740: Enable CEU0

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Date:   Thu, 26 Apr 2018 10:53:00 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     jacopo mondi <jacopo@...ndi.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>, geert@...ux-m68k.org,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dts: r8a7740: Enable CEU0

On Thu, Apr 26, 2018 at 09:26:09AM +0200, jacopo mondi wrote:
> Hi Simon,
> 
> On Thu, Apr 26, 2018 at 08:11:30AM +0200, Simon Horman wrote:
> > Thanks Jacopo,
> >
> > I'm very pleased to see this series.
> 
> Credits to Geert that pointed out to me R-Mobile A1 comes with a CEU.
> I should mention him in next iteration actually, sorry about that.
> 
> >
> > On Wed, Apr 25, 2018 at 01:15:20PM +0200, Jacopo Mondi wrote:
> > > Enable CEU0 peripheral for Renesas R-Mobile A1 R8A7740.
> >
> > Given 'status = "disabled"' below I think you
> > are describing but not enabling CEU0. Also in the subject.
> 
> Right.
> 
> >
> > Should we also describe CEU1?
> 
> Armadillo board file only describe CEU0. If there are R-Mobile A1
> board files where I can steal informations from I can do that. If
> there's a public datasheet, that would be even better.

I have the datasheet, so perhaps I can add CEU1 after you have added CEU0.

> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > > ---
> > >  arch/arm/boot/dts/r8a7740.dtsi | 10 ++++++++++
> > >  1 file changed, 10 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/r8a7740.dtsi b/arch/arm/boot/dts/r8a7740.dtsi
> > > index afd3bc5..05ec41e 100644
> > > --- a/arch/arm/boot/dts/r8a7740.dtsi
> > > +++ b/arch/arm/boot/dts/r8a7740.dtsi
> > > @@ -67,6 +67,16 @@
> > >  		power-domains = <&pd_d4>;
> > >  	};
> > >
> > > +	ceu0: ceu@...10000 {
> > > +		reg = <0xfe910000 0x100>;
> >
> > Should the size of the range be 0x3000 ?
> > That would seem to match my reading of table 32.3
> > and also be consistent with r7s72100.dtsi.
> 
> I got this from
> 
> static struct resource ceu0_resources[] = {
> 	[0] = {
> 		.name	= "CEU",
> 		.start	= 0xfe910000,
> 		.end	= 0xfe91009f,
> 		.flags	= IORESOURCE_MEM,
> 	},
> but I also noticed the r7s72100 one was bigger.
> I'm fine enlarging this, if that's what the manual reports too.

I think that would be best.

> > > +		compatible = "renesas,r8a7740-ceu";
> > > +		interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>;
> > > +		clocks = <&mstp1_clks R8A7740_CLK_CEU20>;
> > > +		clock-names = "ceu20";
> > > +		power-domains = <&pd_a4mp>;
> >
> > My reading of table 1.7 is that the power domain should be A4R (&pd_a4r).
> 
> Ah yes, my bad.
> 
> The long time goal would be describe the camera module (mt9t112) which
> is installed on armadillo. Unfortunately that would probably require
> some more work on the CEU side.

Thanks, understood.