| From 8576e3b867d87df05e2d0eb68015b91251b04c06 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Wed, 8 Aug 2018 10:42:41 -0500 |
| Subject: arm64: dts: stratix10: i2c clock running out of spec |
| |
| From: Alan Tull <atull@kernel.org> |
| |
| [ 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 7c661753bfaf4..faa017d4cd56b 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"; |
| -- |
| 2.20.1 |
| |
