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

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Message-ID: <20200127145931.rjewha4awnlorfvb@gilmour.lan>
Date:   Mon, 27 Jan 2020 15:59:31 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
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

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.

(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 :)

Maxime

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