linux-kernel - [PATCH] ARM: dts: at91: sama5d27_som1

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Date:   Mon, 25 Nov 2019 09:27:41 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>,
        <robh+dt@...nel.org>
CC:     <Nicolas.Ferre@...rochip.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Eugen.Hristev@...rochip.com>
Subject: [PATCH] ARM: dts: at91: sama5d27_som1_ek: add i2c filters properties

From: Eugen Hristev <eugen.hristev@...rochip.com>

Add properties for i2c filters for i2c0 and i2c1 on sama5d27_som1_ek.
Noise is affecting communication on i2c for example when connecting i2c
camera sensors.

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
 arch/arm/boot/dts/at91-sama5d27_som1_ek.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts b/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts
index fca5716..b6a22bb 100644
--- a/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts
+++ b/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts
@@ -123,6 +123,9 @@
 
 			flx1: flexcom@...38000 {
 				atmel,flexcom-mode = <ATMEL_FLEXCOM_MODE_TWI>;
+				i2c-analog-filter;
+				i2c-digital-filter;
+				i2c-digital-filter-width-ns = <35>;
 				status = "okay";
 
 				i2c2: i2c@600 {
@@ -246,6 +249,9 @@
 
 			i2c1: i2c@...28000 {
 				dmas = <0>, <0>;
+				i2c-analog-filter;
+				i2c-digital-filter;
+				i2c-digital-filter-width-ns = <35>;
 				pinctrl-names = "default";
 				pinctrl-0 = <&pinctrl_i2c1_default>;
 				status = "okay";
-- 
2.7.4