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Subject[PATCH] arm64: dts: stratix10: i2c clock running out of spec
Date
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>
---
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 6edc4fa..53cf195 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";
--
2.7.4
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