ARM: dts: sun7i: Add A20 SRAM and SRAM controller

The A20 has a few SRAM that can be mapped either to a device or to the CPU,
with the mapping being controlled by a SRAM controller.

Since most of the time these SRAM won't be accessible by the CPU,
we can't use the mmio-sram driver and compatible.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[hdegoede@redhat.com: Do not change soc node name, change compatible to
 sun4i-a10-sram-controller to match the driver change]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
index 24eae39..d4ba772 100644 (file)
--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -521,12 +521,46 @@
                };
        };
 
+       /*
+        * Note we use the address where the mmio registers start, not where
+        * the SRAM blocks start, this cannot be changed because that would be
+        * a devicetree ABI change.
+        */
        soc@01c00000 {
                compatible = "simple-bus";
                #address-cells = <1>;
                #size-cells = <1>;
                ranges;
 
+               sram@00000000 {
+                       compatible = "allwinner,sun4i-a10-sram";
+                       reg = <0x00000000 0x4000>;
+                       allwinner,sram-name = "A1";
+               };
+
+               sram@00004000 {
+                       compatible = "allwinner,sun4i-a10-sram";
+                       reg = <0x00004000 0x4000>;
+                       allwinner,sram-name = "A2";
+               };
+
+               sram@00008000 {
+                       compatible = "allwinner,sun4i-a10-sram";
+                       reg = <0x00008000 0x4000>;
+                       allwinner,sram-name = "A3-A4";
+               };
+
+               sram@00010000 {
+                       compatible = "allwinner,sun4i-a10-sram";
+                       reg = <0x00010000 0x1000>;
+                       allwinner,sram-name = "D";
+               };
+
+               sram-controller@01c00000 {
+                       compatible = "allwinner,sun4i-a10-sram-controller";
+                       reg = <0x01c00000 0x30>;
+               };
+
                nmi_intc: interrupt-controller@01c00030 {
                        compatible = "allwinner,sun7i-a20-sc-nmi";
                        interrupt-controller;