* [PATCH] arm64: dts: stratix10: i2c clock running out of spec
@ 2018-08-08 15:42 Alan Tull
2018-08-15 15:08 ` Dinh Nguyen
0 siblings, 1 reply; 2+ messages in thread
From: Alan Tull @ 2018-08-08 15:42 UTC (permalink / raw)
To: Dinh Nguyen, Rob Herring, Mark Rutland, Catalin Marinas, Will Deacon
Cc: Alan Tull, devicetree, linux-arm-kernel, linux-kernel
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";
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] arm64: dts: stratix10: i2c clock running out of spec
2018-08-08 15:42 [PATCH] arm64: dts: stratix10: i2c clock running out of spec Alan Tull
@ 2018-08-15 15:08 ` Dinh Nguyen
0 siblings, 0 replies; 2+ messages in thread
From: Dinh Nguyen @ 2018-08-15 15:08 UTC (permalink / raw)
To: Alan Tull, Rob Herring, Mark Rutland, Catalin Marinas, Will Deacon
Cc: devicetree, linux-arm-kernel, linux-kernel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-08-08 15:42 [PATCH] arm64: dts: stratix10: i2c clock running out of spec Alan Tull
2018-08-15 15:08 ` Dinh Nguyen
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