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    Subject[PATCH 4.19 076/422] arm64: dts: stratix10: i2c clock running out of spec
    Date
    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


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