于 2018年5月2日 GMT+08:00 下午7:32:50, Maxime Ripard [off-list ref] 写到:

On Mon, Apr 30, 2018 at 05:10:39PM +0530, Jagan Teki wrote:

quoted

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-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
---
 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

quoted

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.

quoted

+			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 :-(

Maxime

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