76 lines
2.0 KiB
Diff
76 lines
2.0 KiB
Diff
From 15dedc2ad5a9073b8639881680672214f605a5c6 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 31 Jan 2024 17:44:02 +0000
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Subject: [PATCH 1264/1295] ARM: dts: rp1: Add a safe I2C SDA hold time
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Failing to set a reasonable SDA hold time can cause SDA to change too
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close to the falling edge of SCL. 300ns is the recommended minimum
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interval between the two at 100kHz and 400kHz, and also seems to
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work at 1MHz, so use that.
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See: https://github.com/raspberrypi/linux/issues/5914
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm/boot/dts/rp1.dtsi | 7 +++++++
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1 file changed, 7 insertions(+)
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--- a/arch/arm/boot/dts/rp1.dtsi
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+++ b/arch/arm/boot/dts/rp1.dtsi
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@@ -307,6 +307,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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@@ -317,6 +318,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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@@ -327,6 +329,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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@@ -337,6 +340,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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@@ -347,6 +351,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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@@ -357,6 +362,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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@@ -367,6 +373,7 @@
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clocks = <&rp1_clocks RP1_CLK_SYS>;
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i2c-scl-rising-time-ns = <65>;
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i2c-scl-falling-time-ns = <100>;
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+ i2c-sda-hold-time-ns = <300>;
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status = "disabled";
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};
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