From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Tull Subject: [PATCH] arm64: dts: stratix10: i2c clock running out of spec Date: Wed, 8 Aug 2018 10:42:41 -0500 Message-ID: <20180808154241.3760-1-atull@kernel.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Dinh Nguyen , Rob Herring , Mark Rutland , Catalin Marinas , Will Deacon Cc: Alan Tull , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 --- 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