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

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Date:   Fri, 17 Feb 2023 16:40:19 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Xu Yilun <yilun.xu@...el.com>, conor@...nel.org
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Tom Rix <trix@...hat.com>, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: [PATCH v1 2/6] dt-bindings: soc: microchip: add a property for system controller flash

From: Conor Dooley <conor.dooley@...rochip.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@...rochip.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