From d4e5c8aeb19823ab4ea9725a9b093f05cdfb0825 Mon Sep 17 00:00:00 2001
From: Alan Tull <atull@kernel.org>
Date: Wed, 8 Aug 2018 10:42:41 -0500
Subject: [PATCH] arm64: dts: stratix10: i2c clock running out of spec

[ Upstream commit c8da1d15b8a4957f105ad77bb1404d72e304566f ]

DesignWare I2C controller was observed running at 105.93kHz rather
than the specified 100kHz.  Adjust device tree settings to bring it
within spec (a slightly conservative 98 MHz).

Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
index 7c661753bfaf..faa017d4cd56 100644
--- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
+++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
@@ -124,6 +124,8 @@
 &i2c1 {
 	status = "okay";
 	clock-frequency = <100000>;
+	i2c-sda-falling-time-ns = <890>;  /* hcnt */
+	i2c-sdl-falling-time-ns = <890>;  /* lcnt */
 
 	adc@14 {
 		compatible = "lltc,ltc2497";