[PATCH v1 2/6] dt-bindings: soc: microchip: add a property for system controller flash

Conor Dooley
2023-02-17T16:40:55Z

From: Conor Dooley <conor.dooley@microchip.com>

The system controller "shares" a SPI flash device with a QSPI controller
in the MSS. This flash is used to store FPGA bitstreams & other
metadata. IAP and Auto Upgrade both write images to this flash that the
System Controller will use to re-program the FPGA.

Add a phandle property signifying which flash device is connected to the
system controller.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
.../soc/microchip/microchip,mpfs-sys-controller.yaml | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml
index 04ffee3a7c59..97a7cb74cbf9 100644
--- a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml
+++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml
@@ -26,6 +26,16 @@ properties:
compatible:
const: microchip,mpfs-sys-controller

+ microchip,bitstream-flash:
+ $ref: "/schemas/types.yaml#/definitions/phandle"
+ description:
+ The SPI flash connected to the system controller's QSPI controller.
+ The system controller may retrieve FPGA bitstreams from this flash to
+ perform In-Application Programming (IAP) or during device initialisation
+ for Auto Update. The MSS and system controller have separate QSPI
+ controllers and this flash is connected to both. Software running in the
+ MSS can write bitstreams to the flash.
+
required:
- compatible
- mboxes
--
2.39.1