linux-kernel - Re: [PATCH 3/5] arm64: dts: allwinner: a64: Add MBUS controller node

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Message-ID: <1736895.tdWV9SEqCh@jernej-laptop>
Date:   Mon, 27 Jan 2020 20:05:27 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     wens@...e.org, mchehab@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 3/5] arm64: dts: allwinner: a64: Add MBUS controller node

Dne ponedeljek, 27. januar 2020 ob 15:59:31 CET je Maxime Ripard napisal(a):
> Hi,
> 
> On Sat, Jan 25, 2020 at 12:03:51PM +0100, Jernej Skrabec wrote:
> > A64 contains MBUS, which is the bus used by DMA devices to access
> > system memory.
> > 
> > MBUS controller is responsible for arbitration between channels based
> > on set priority and can do some other things as well, like report
> > bandwidth used. It also maps RAM region to different address than CPU.
> > 
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > ---
> > 
> >  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi index
> > 862b47dc9dc9..d225ea1f3b87 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > @@ -1061,6 +1061,14 @@ pwm: pwm@...1400 {
> > 
> >  			status = "disabled";
> >  		
> >  		};
> > 
> > +		mbus: dram-controller@...2000 {
> > +			compatible = "allwinner,sun50i-a64-mbus";
> > +			reg = <0x01c62000 0x1000>;
> > +			clocks = <&ccu CLK_MBUS>;
> 
> We're merging the clock header patch and the DT through two different
> trees, so you can't use it right away. You should use the raw ID here.

Ok.

> 
> (also, as a general remark, it's easier on us to not send the patches
> during the rc6 <-> rc1 phase), so if you can resend them as soon as
> rc1 is out, that would be great :)

Ok, I'll send v2 then.

Best regards,
Jernej