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

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Date:   Thu, 26 Apr 2018 09:26:09 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Simon Horman <horms@...ge.net.au>
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

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.
>
> >
> > 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.

> > +		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
   j

>
> > +		status = "disabled";
> > +	};
> > +
> >  	cmt1: timer@...38000 {
> >  		compatible = "renesas,cmt-48-r8a7740", "renesas,cmt-48";
> >  		reg = <0xe6138000 0x170>;
> > --
> > 2.7.4
> >

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