From 31aabbd6a424b1018d1c44fe4214a17ae77328c4 Mon Sep 17 00:00:00 2001
From: Daniel Drown <dan-android@drown.org>
Date: Thu, 23 Apr 2020 01:15:12 -0500
Subject: [PATCH] ARM: dts: stm32: use pll4_p for ethernet PTP clock

IEEE 1588 support needs a clock defined as ptp_ref and this uses pll4_p
as the parent clock
---
 arch/arm/boot/dts/stm32mp157c.dtsi | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/stm32mp157c.dtsi b/arch/arm/boot/dts/stm32mp157c.dtsi
index bd0ab3b8cbf36a..8a90c909cc87f8 100644
--- a/arch/arm/boot/dts/stm32mp157c.dtsi
+++ b/arch/arm/boot/dts/stm32mp157c.dtsi
@@ -1822,11 +1822,15 @@
 			clock-names = "stmmaceth",
 				      "mac-clk-tx",
 				      "mac-clk-rx",
-				      "ethstp";
+				      "ethstp",
+				      "ptp_ref";
 			clocks = <&rcc ETHMAC>,
 				 <&rcc ETHTX>,
 				 <&rcc ETHRX>,
-				 <&rcc ETHSTP>;
+				 <&rcc ETHSTP>,
+				 <&rcc ETHPTP_K>;
+			assigned-clocks = <&rcc ETHPTP_K>;
+			assigned-clock-parents = <&rcc PLL4_P>;
 			st,syscon = <&syscfg 0x4>;
 			snps,mixed-burst;
 			snps,pbl = <2>;