From 9b67898e99b87283e3ca4b8425defed4cb5ddf09 Mon Sep 17 00:00:00 2001
From: Andrew Dennison <andrew@motec.com.au>
Date: Thu, 14 Oct 2021 08:51:01 +1100
Subject: [PATCH] tools/linux: add sys_clk to device tree

* required for using standard devm_clk_get() clock mechanism in linux drivers
---
 litex/tools/litex_json2dts_linux.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/litex/tools/litex_json2dts_linux.py b/litex/tools/litex_json2dts_linux.py
index 4bc91ac55..c94c8d8ee 100755
--- a/litex/tools/litex_json2dts_linux.py
+++ b/litex/tools/litex_json2dts_linux.py
@@ -88,6 +88,16 @@ def generate_dts(d, initrd_start=None, initrd_size=None, initrd=None, root_devic
         };
 """
 
+    # Clocks ------------------------------------------------------------------------------------------
+
+    dts += """
+        sys_clk: pll {{
+            compatible = "fixed-clock";
+            #clock-cells = <0>;
+            clock-frequency  = <{sys_clk_freq}>;
+        }};
+""".format(sys_clk_freq=d["constants"]["config_clock_frequency"])
+
     # CPU ------------------------------------------------------------------------------------------
 
     # RISC-V