From fe9d56c1618608c6f0bb6088c80695c8748f7b37 Mon Sep 17 00:00:00 2001
From: Joris van Rantwijk <joris@jorisvr.nl>
Date: Fri, 4 Oct 2024 17:14:47 +0200
Subject: [PATCH] Add SPI devices in devicetree

---
 sw/devicetree/redpitaya_puzzlefw.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sw/devicetree/redpitaya_puzzlefw.dts b/sw/devicetree/redpitaya_puzzlefw.dts
index 83b5415..2966586 100644
--- a/sw/devicetree/redpitaya_puzzlefw.dts
+++ b/sw/devicetree/redpitaya_puzzlefw.dts
@@ -169,6 +169,21 @@
 	status = "okay";
 	is-decoded-cs = <0>;
 	num-cs = <3>;
+
+	// The SPI ports of both ADC chips on the Red Pitaya 4-input board
+	// are connected, via the FPGA, to the PS SPI0 master.
+	adca@0 {
+		// We use a fake compatible string to work around
+		// a limitation in the Linux spidev driver.
+		compatible = "rohm,dh2228fv";
+		reg = <0>;
+		spi-max-frequency = <4000000>;
+	};
+	adcb@1 {
+		compatible = "rohm,dh2228fv";
+		reg = <1>;
+		spi-max-frequency = <4000000>;
+	};
 };
 
 &spi1 {