From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Tue, 27 Feb 2018 16:01:57 +0000 (+0000)
Subject: ARM: dts: armada388-clearfog: increase speed of i2c0 to 400kHz
X-Git-Tag: v4.19~1283^2~11^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a83aeb3836b1cd65770b20eafefbef7467972fa2;p=platform%2Fkernel%2Flinux-rpi3.git

ARM: dts: armada388-clearfog: increase speed of i2c0 to 400kHz

All the devices on I2C0 support fast mode, so increase the bus speed
to match.  The Armada 388 is known to have a timing issue when in
standard mode, which we believe causes the ficticious device at 0x64
to appear.

[gregory.clement@bootlin.com: Note that since the commit fbffee74986c
("ARM: dts: Fix I2C repeated start issue on Armada-38x") in 4.14, the
timing issue is managed for the Armada 38x SoCs.]

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---

diff --git a/arch/arm/boot/dts/armada-388-clearfog.dtsi b/arch/arm/boot/dts/armada-388-clearfog.dtsi
index 68acfc9..0e3b1f1 100644
--- a/arch/arm/boot/dts/armada-388-clearfog.dtsi
+++ b/arch/arm/boot/dts/armada-388-clearfog.dtsi
@@ -143,8 +143,7 @@
 };
 
 &i2c0 {
-	/* Is there anything on this? */
-	clock-frequency = <100000>;
+	clock-frequency = <400000>;
 	pinctrl-0 = <&i2c0_pins>;
 	pinctrl-names = "default";
 	status = "okay";
@@ -239,13 +238,11 @@
 		};
 	};
 
-	/* The MCP3021 is 100kHz clock only */
+	/* The MCP3021 supports standard and fast modes */
 	mikrobus_adc: mcp3021@4c {
 		compatible = "microchip,mcp3021";
 		reg = <0x4c>;
 	};
-
-	/* Also something at 0x64 */
 };
 
 &i2c1 {