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

Maxime Ripard
2018-05-02T11:49:24Z

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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@bootlin.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@amarulasolutions.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@1000000 {
> >> + 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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