From: atull@kernel.org (Alan Tull)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: dts: stratix10: i2c clock running out of spec
Date: Wed, 8 Aug 2018 10:42:41 -0500 [thread overview]
Message-ID: <20180808154241.3760-1-atull@kernel.org> (raw)
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 at 14 {
compatible = "lltc,ltc2497";
--
2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Alan Tull <atull@kernel.org>
To: Dinh Nguyen <dinguyen@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>
Cc: Alan Tull <atull@kernel.org>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] arm64: dts: stratix10: i2c clock running out of spec
Date: Wed, 8 Aug 2018 10:42:41 -0500 [thread overview]
Message-ID: <20180808154241.3760-1-atull@kernel.org> (raw)
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
next reply other threads:[~2018-08-08 15:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-08 15:42 Alan Tull [this message]
2018-08-08 15:42 ` [PATCH] arm64: dts: stratix10: i2c clock running out of spec Alan Tull
2018-08-15 15:08 ` Dinh Nguyen
2018-08-15 15:08 ` Dinh Nguyen
2018-08-15 15:08 ` Dinh Nguyen
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