ARM: dts: sun5i: Add the MBUS controller

The MBUS (and its associated controller) is the bus in the Allwinner SoCs
that DMA devices use in the system to access the memory.

Among other things (and depending on the SoC generation), it can also
enforce priorities or report bandwidth usages on a per-master basis.

One of the most notable thing is that instead of having the same mapping
for the RAM than the CPU, it maps it at address 0, which means we'll have
to do address translation thanks to the dma-ranges property.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi
index 8dd49016eb1ee57b1eebe2ccb9cb97b31fb902f6..cb820bd7974c41005a9de83b3a361223211566f1 100644 (file)
--- a/arch/arm/boot/dts/sun5i.dtsi
+++ b/arch/arm/boot/dts/sun5i.dtsi
@@ -127,6 +127,7 @@
                compatible = "simple-bus";
                #address-cells = <1>;
                #size-cells = <1>;
+               dma-ranges;
                ranges;
 
                system-control@1c00000 {
@@ -181,6 +182,14 @@
                        };
                };
 
+               mbus: dram-controller@1c01000 {
+                       compatible = "allwinner,sun5i-a13-mbus";
+                       reg = <0x01c01000 0x1000>;
+                       clocks = <&ccu 99>;
+                       dma-ranges = <0x00000000 0x40000000 0x20000000>;
+                       #interconnect-cells = <1>;
+               };
+
                dma: dma-controller@1c02000 {
                        compatible = "allwinner,sun4i-a10-dma";
                        reg = <0x01c02000 0x1000>;
@@ -723,6 +732,8 @@
                        clock-names = "ahb", "mod",
                                      "ram";
                        resets = <&ccu RST_DE_FE>;
+                       interconnects = <&mbus 19>;
+                       interconnect-names = "dma-mem";
                        status = "disabled";
 
                        ports {
@@ -748,6 +759,8 @@
                        clock-names = "ahb", "mod",
                                      "ram";
                        resets = <&ccu RST_DE_BE>;
+                       interconnects = <&mbus 18>;
+                       interconnect-names = "dma-mem";
                        status = "disabled";
 
                        assigned-clocks = <&ccu CLK_DE_BE>;