linux-kernel - [PATCH v2 8/8] ARM: bcm2835: Disable i2c2 in the Device Tree

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Date:   Tue, 27 Sep 2016 13:57:06 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     wsa@...-dreams.de, swarren@...dotorg.org, eric@...olt.net
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org,
        Noralf Trønnes <noralf@...nnes.org>
Subject: [PATCH v2 8/8] ARM: bcm2835: Disable i2c2 in the Device Tree

i2c2 is connected to the HDMI connector and is controlled by the
firmware. Disable it to stay out of harms way.

>From the downstream commit:
i2c-bcm2708/BCM270X_DT: Add support for I2C2

The third I2C bus (I2C2) is normally reserved for HDMI use. Careless
use of this bus can break an attached display - use with caution.

It is recommended to disable accesses by VideoCore by setting
hdmi_ignore_edid=1 or hdmi_edid_file=1 in config.txt.

Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
---
 arch/arm/boot/dts/bcm2835-rpi.dtsi | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index e9b47b2..8bffbee 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -59,10 +59,6 @@
 	clock-frequency = <100000>;
 };
 
-&i2c2 {
-	status = "okay";
-};
-
 &sdhci {
 	status = "okay";
 	bus-width = <4>;
-- 
2.8.2