Hi Icenowy,

On Sun, Jun 24, 2018 at 12:34 AM Icenowy Zheng [off-list ref] wrote:

于 2018年6月23日 GMT+08:00 下午10:06:27, Julian Calaby [off-list ref] 写到:

quoted

Hi Icenowy,

On Fri, Jun 22, 2018 at 10:49 PM Icenowy Zheng [off-list ref] wrote:

quoted

As we have all necessary parts to enable the DE2 CCU on the Allwinner
A64 SoC, add the needed device tree nodes, including the DE2 CCU

itself

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and the DE2 bus.

The "mixer0-lcd0" simplefb device node is updated to use the DE2 CCU.

Signed-off-by: Icenowy Zheng <redacted>
---
Changes in v2:
- Drop SRAM controller device tree node addition (as it's already

added

quoted

  as part of syscon change.)
- Fix the clock reference in LCD SimpleFB.

 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 30

+++++++++++++++----

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 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi

b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi

quoted

index ff2ddde1e117..318c4ba8ae9f 100644

--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi

@@ -58,17 +60,12 @@
                #size-cells = <1>;
                ranges;

-/*
- * The pipeline mixer0-lcd0 depends on clock CLK_MIXER0 from DE2

CCU.

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- * However there is no support for this clock on A64 yet, so we

depend

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- * on the upstream clocks here to keep them (and thus CLK_MIXER0)

up.

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- */
                simplefb_lcd: framebuffer-lcd {
                        compatible = "allwinner,simple-framebuffer",
                                     "simple-framebuffer";
                        allwinner,pipeline = "mixer0-lcd0";
                        clocks = <&ccu CLK_TCON0>,
-                                <&ccu CLK_DE>, <&ccu CLK_BUS_DE>;
+                                <&display_clocks CLK_MIXER0>;

Doesn't this technically break simplefb if this DT is used with a
Linux that doesn't have the display clock driver?

1. DT doesn't care forware compatibility.

Ah, fair enough, that answers my question.

Thanks,

-- 
Julian Calaby

Email: julian.calaby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Profile: http://www.google.com/profiles/julian.calaby/

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