[PATCH v3 6/6] riscv: dts: microchip: add the mpfs' system controller qspi & associated flash

[Conor Dooley]

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

The system controller's flash can be accessed via an MSS-exposed QSPI
controller sitting, which sits between the mailbox's control & data
registers. On Icicle, it has an MT25QL01GBBB8ESF connected to it.

The system controller and MSS both have separate QSPI controllers, both
of which can access the flash, although the system controller takes
priority.
Unfortunately, on engineering sample silicon, such as that on Icicle
kits, the MSS' QSPI controller cannot write to the flash due to a bug.
As a workaround, a QSPI controller can be implemented in the FPGA
fabric and the IO routing modified to connect it to the flash in place
of the "hard" controller in the MSS.

Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
---
 .../boot/dts/microchip/mpfs-icicle-kit.dts    | 21 +++++++++++++++++++
 arch/riscv/boot/dts/microchip/mpfs.dtsi       | 17 +++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts b/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
index 90b261114763..2dae3f8f33f6 100644
--- a/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
+++ b/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
@@ -199,6 +199,27 @@ &syscontroller {
 	status = "okay";
 };
 
+&syscontroller_qspi {
+	/*
+	 * The flash *is* there, but Icicle kits that have engineering sample
+	 * silicon (write?) access to this flash to non-functional. The system
+	 * controller itself can actually access it, but the MSS cannot write
+	 * an image there. Instantiating a coreQSPI in the fabric & connecting
+	 * it to the flash instead should work though. Pre-production or later
+	 * silicon does not have this issue.
+	 */
+	status = "disabled";
+
+	sys_ctrl_flash: flash at 0 { // MT25QL01GBBB8ESF-0SIT
+		compatible = "jedec,spi-nor";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		spi-max-frequency = <20000000>;
+		spi-rx-bus-width = <1>;
+		reg = <0>;
+	};
+};
+
 &usb {
 	status = "okay";
 	dr_mode = "host";
diff --git a/arch/riscv/boot/dts/microchip/mpfs.dtsi b/arch/riscv/boot/dts/microchip/mpfs.dtsi
index 104504352e99..8f66e2c839ef 100644
--- a/arch/riscv/boot/dts/microchip/mpfs.dtsi
+++ b/arch/riscv/boot/dts/microchip/mpfs.dtsi
@@ -178,6 +178,12 @@ syscontroller: syscontroller {
 		mboxes = <&mbox 0>;
 	};
 
+	scbclk: mssclkclk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <80000000>;
+	};
+
 	soc {
 		#address-cells = <2>;
 		#size-cells = <2>;
@@ -508,5 +514,16 @@ mbox: mailbox at 37020000 {
 			#mbox-cells = <1>;
 			status = "disabled";
 		};
+
+		syscontroller_qspi: spi at 37020100 {
+			compatible = "microchip,mpfs-qspi", "microchip,coreqspi-rtl-v2";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x0 0x37020100 0x0 0x100>;
+			interrupt-parent = <&plic>;
+			interrupts = <110>;
+			clocks = <&scbclk>;
+			status = "disabled";
+		};
 	};
 };
-- 
2.39.2