| Message ID | 20180808154241.3760-1-atull@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: dts: stratix10: i2c clock running out of spec | expand |
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 <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"; > Applied! Thanks, Dinh
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";
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(+)