linux-kernel - [PATCH v2 2/7] dt-bindings: soc: microchip: add a property for system controller flash

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Message-ID: <20230331071823.956087-3-conor.dooley@microchip.com>
Date:   Fri, 31 Mar 2023 08:18:18 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     <linux-fpga@...r.kernel.org>
CC:     <conor@...nel.org>, <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>,
        Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>,
        <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Rob Herring <robh@...nel.org>
Subject: [PATCH v2 2/7] dt-bindings: soc: microchip: add a property for system controller flash

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.

Reviewed-by: Rob Herring <robh@...nel.org>
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..aee96c639af7 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
-- 
2.39.2