From: Alan Tull <atull@kernel.org>
Date: Wed, 8 Aug 2018 15:42:41 +0000 (-0500)
Subject: arm64: dts: stratix10: i2c clock running out of spec
X-Git-Tag: v4.20-rc1~66^2~61^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c8da1d15b8a4957f105ad77bb1404d72e304566f;p=thirdparty%2Fkernel%2Flinux.git

arm64: dts: stratix10: i2c clock running out of spec

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>
---

diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
index 6edc4fa9fd426..53cf195c2ada2 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";