On 02/08/2022 00:12, Elliot Berman wrote:
When Linux is booted as a guest under the Gunyah hypervisor, Gunyah
applies a devicetree overlay describing the virtual platform
configuration of the guest VM, such as the message queue capability IDs
for communicating with the Resource Manager. Add the DT bindings that
Gunyah adheres for the hypervisor node and message queues.
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
.../bindings/firmware/gunyah-hypervisor.yaml | 84 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 85 insertions(+)
create mode 100644 Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
diff --git a/Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml b/Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
new file mode 100644
index 000000000000..e50d932e768c
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/gunyah-hypervisor.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Gunyah Hypervisor
+
+maintainers:
+ - Murali Nalajala <quic_mnalajal@xxxxxxxxxxx>
+ - Elliot Berman <quic_eberman@xxxxxxxxxxx>
+
+description: |+
+ On systems which support devicetree, Gunyah generates and overlays a deviceetree overlay which
+ describes the basic configuration of the hypervisor. Virtual machines use this information for
+ initial discovery that they are running as a Gunyah guest VM.
+ See also: https://github.com/quic/gunyah-resource-manager/blob/develop/src/vm_creation/dto_construct.c
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - const: gunyah-hypervisor-1.0
+ - const: gunyah-hypervisor
Just:
- items:
- const: gunyah-hypervisor-1.0
- const: gunyah-hypervisor
oneOf is not necessary
+
+ "#address-cells":
+ description: Number of cells needed to represent 64-bit capability IDs.
+ const: 2
+ "#size-cells":
+ description: must be 0, because capability IDs are not memory address
+ ranges and do not have a size.
+ const: 0
+
+patternProperties:
+ "^gunyah-resource-mgr(@.*)?":
+ type: object
+ description:
+ Resource Manager node which is required to communicate to Resource
+ Manager VM using Gunyah Message Queues.
+
+ properties:
+ compatible:
+ oneOf:
Again, please drop the oneOf.
+ - items:
+ - const: gunyah-resource-manager-1-0
+ - const: gunyah-resource-manager
+ reg:
+ items:
+ - description: Gunyah capability ID of the TX message queue
+ - description: Gunyah capability ID of the RX message queue
+ interrupts:
+ items:
+ - description: Interrupt for the TX message queue
+ - description: Interrupt for the RX message queue
+ additionalProperties: false
+ required:
+ - compatible
+ - reg
+ - interrupts
+
+additionalProperties: false
+
+required:
+ - compatible
+ - "#address-cells"
+ - "#size-cells"
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ hypervisor {
+ #address-cells = <2>;
+ #size-cells = <0>;
+ compatible = "gunyah-hypervisor-1.0", "gunyah-hypervisor";
+
+ gunyah-resource-mgr@1 {
+ compatible = "gunyah-resource-manager-1-0", "gunyah-resource-manager";
+ interrupts = <GIC_SPI 3 IRQ_TYPE_EDGE_RISING>, /* TX full IRQ */
+ <GIC_SPI 4 IRQ_TYPE_EDGE_RISING>; /* RX empty IRQ */
+ reg = <0x00000000 0x00000000>, <0x00000000 0x00000001>;
+ /* TX, RX cap ids */
Do these cap ids persist from platform to platform? Then you might want
to define generic values for these caps.
Also it feels like you are misusing the #address-cells/reg properties.
For example, the device should have its @NNNN to be equal to the first
addres. But you are using the second reg.
I think that using a separate property with /bits/ 64 might be a better
solution.
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 18fb034526e1..0cd12ea6c11c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8741,6 +8741,7 @@ M: Elliot Berman <quic_eberman@xxxxxxxxxxx>
M: Murali Nalajala <quic_mnalajal@xxxxxxxxxxx>
L: linux-arm-msm@xxxxxxxxxxxxxxx
S: Maintained
+F: Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
F: Documentation/virt/gunyah/
HABANALABS PCI DRIVER
--
With best wishes
Dmitry
