linux-kernel - Re: [PATCH 02/21] arm64: dts: allwinner: a64: Add DE2 CCU

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Date:   Wed, 2 May 2018 13:32:50 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 02/21] arm64: dts: allwinner: a64: Add DE2 CCU

On Mon, Apr 30, 2018 at 05:10:39PM +0530, Jagan Teki wrote:
> DE2 in A64 has clock control unit and behavior is
> same like H3/H5, so reuse the same in A64.
> 
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index 1b2ef28c42bd..67b80bbe5bf5 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -43,9 +43,11 @@
>   */
>  
>  #include <dt-bindings/clock/sun50i-a64-ccu.h>
> +#include <dt-bindings/clock/sun8i-de2.h>
>  #include <dt-bindings/clock/sun8i-r-ccu.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/reset/sun50i-a64-ccu.h>
> +#include <dt-bindings/reset/sun8i-de2.h>
>  
>  / {
>  	interrupt-parent = <&gic>;
> @@ -168,6 +170,19 @@
>  		#size-cells = <1>;
>  		ranges;
>  
> +		display_clocks: clock@...0000 {
> +			compatible = "allwinner,sun50i-a64-de2-clk",
> +				     "allwinner,sun50i-h5-de2-clk";

The A64 was released before the H5, so that should be the other way
around.

> +			reg = <0x01000000 0x100000>;
> +			clocks = <&ccu CLK_DE>,
> +				 <&ccu CLK_BUS_DE>;
> +			clock-names = "mod",
> +				      "bus";
> +			resets = <&ccu RST_BUS_DE>;
> +			#clock-cells = <1>;
> +			#reset-cells = <1>;
> +		};
> +

So it turns out we don't need the SRAM to access the CCU driver?

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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