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

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Message-ID: <20180502114924.pq5k5p33svedgca4@flea>
Date:   Wed, 2 May 2018 13:49:24 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Jagan Teki <jagan@...rulasolutions.com>,
        Chen-Yu Tsai <wens@...e.org>,
        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: [linux-sunxi] Re: [PATCH 02/21] arm64: dts: allwinner: a64: Add
 DE2 CCU

On Wed, May 02, 2018 at 07:34:21PM +0800, Icenowy Zheng wrote:
> 
> 
> 于 2018年5月2日 GMT+08:00 下午7:32:50, Maxime Ripard <maxime.ripard@...tlin.com> 写到:
> >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?
> 
> As now U-Boot claims SRAM, people may forget thus :-(

This is definitely not ok. We should have that described in the DT as
well.

Maxime

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

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