Support for variable frequency clocks is implemented in ARM Trusted
Firmware, which sits in SRAM and waits for SCPI requests.
Add the respective SMC mailbox node and a 512-byte chunk of SRAM to
allow SCPI calls to be handled by the firmware.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 70d0382..9fc540e 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -131,8 +131,34 @@
(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
};
+ mailbox: mbox@0 {
+ compatible = "arm,smc-mbox";
+ #mbox-cells = <1>;
+ identifiers = <0x82000001>;
+ };
+
+ sram: sram@18000{
+ compatible = "mmio-sram";
+ reg = <0x10000 0x8000>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x10000 0x8000>;
+
+ cpu_scp_mem: scp-shmem@7e00 {
+ compatible = "mmio-sram";
+ reg = <0x7e00 0x200>;
+ };
+ };
+
/include/ "sun50i-a64-clocks.dtsi"
+ scpi {
+ compatible = "arm,scpi";
+ mboxes = <&mailbox 0>;
+ shmem = <&cpu_scp_mem>;
+ };
+
soc {
compatible = "simple-bus";
#address-cells = <1>;
--
2.9.0
--
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