overlays: Add Pi 5 version of dwc2

Most bus masters on Pi 5 have access to at least the lower 4GB, but
the old DWC OTG controller is still restricted to the first 1GB.
Create a Pi 5-specific version of the overlay including a fragment
that ensures the swiotlb bounce buffers are allocated in that
area.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index 57e2577..5b1380b 100644 (file)
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -59,6 +59,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
        draws.dtbo \
        dwc-otg.dtbo \
        dwc2.dtbo \
+       dwc2-pi5.dtbo \
        edt-ft5406.dtbo \
        enc28j60.dtbo \
        enc28j60-spi2.dtbo \

diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index daf28e2..a030e11 100644 (file)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1107,6 +1107,10 @@ Params: dr_mode                 Dual role mode: "host", "peripheral" or "otg"
                                 mode
 
 
+Name:   dwc2-pi5
+Info:   See dwc2 (this is the Pi 5 version)
+
+
 [ The ds1307-rtc overlay has been deleted. See i2c-rtc. ]
 
 

diff --git a/arch/arm/boot/dts/overlays/dwc2-pi5-overlay.dts b/arch/arm/boot/dts/overlays/dwc2-pi5-overlay.dts
new file mode 100644 (file)
index 0000000..e552c63
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/dwc2-pi5-overlay.dts
@@ -0,0 +1,18 @@
+#include "dwc2-overlay.dts"
+
+/{
+       fragment@1 {
+               target-path = "/";
+               __overlay__ {
+                       /*
+                        * Add a node with a dma-ranges value that exists only to be found
+                        * by of_dma_get_max_cpu_address, and hence limit the DMA zone.
+                        */
+                       zone_dma {
+                                #address-cells = <1>;
+                                #size-cells = <1>;
+                                dma-ranges = <0x0  0x0 0x0  0x40000000>;
+                       };
+               };
+       };
+};

diff --git a/arch/arm/boot/dts/overlays/overlay_map.dts b/arch/arm/boot/dts/overlays/overlay_map.dts
index bcaefcb..5c9dc16 100644 (file)
--- a/arch/arm/boot/dts/overlays/overlay_map.dts
+++ b/arch/arm/boot/dts/overlays/overlay_map.dts
@@ -48,6 +48,16 @@
                bcm2712;
        };
 
+       dwc2 {
+               bcm2835;
+               bcm2711;
+               bcm2712 = "dwc2-pi5";
+       };
+
+       dwc2-pi5 {
+               bcm2712;
+       };
+
        highperi {
                bcm2711;
        };