From mboxrd@z Thu Jan 1 00:00:00 1970 From: dinguyen@kernel.org (Dinh Nguyen) Date: Wed, 15 Aug 2018 10:08:24 -0500 Subject: [PATCH] arm64: dts: stratix10: i2c clock running out of spec In-Reply-To: <20180808154241.3760-1-atull@kernel.org> References: <20180808154241.3760-1-atull@kernel.org> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 08/08/2018 10:42 AM, Alan Tull wrote: > 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 at 14 { > compatible = "lltc,ltc2497"; > Applied! Thanks, Dinh