From: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
[hdegoede@xxxxxxxxxx: 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@xxxxxxxxxx>
---
arch/arm/boot/dts/sun7i-a20.dtsi | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
index 465a19f..e6f4a33 100644
--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -529,12 +529,46 @@
};
};
+ /*
+ * 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;
--
2.3.3
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