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Commit 97a4a1ba authored by Doug Anderson's avatar Doug Anderson Committed by Olof Johansson
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ARM: dts: Add i2c-arbitrator bus for exynos5250-snow 



We need to use the i2c-arbitrator to talk to any of the devices on i2c
bus 4 on exynos5250-snow so that we don't confuse the embedded
controller (EC).  Add the i2c-arbitrator to the device tree.  As we
add future devices (keyboard, sbs, tps65090) we'll add them on top of
this.

The arbitrated bus is numbered 104 simply as a convenience to make it
easier for people poking around to guess that it might have something
to do with the physical bus 4.

The addition is split between the cros5250-common and the snow device
tree file since not all cros5250-class devices use arbitration.

Signed-off-by: default avatarDoug Anderson <dianders@chromium.org>
Acked-by: default avatarKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 6cae0faf

arch/arm/boot/dts/cros5250-common.dtsi

+2 −1
Original line number Original line Diff line number Diff line
@@ -193,7 +193,8 @@ 
	};

	};





	i2c@12CA0000 {

	i2c@12CA0000 {

		status = "disabled";

		samsung,i2c-sda-delay = <100>;

		samsung,i2c-max-bus-freq = <66000>;

	};

	};





	i2c@12CB0000 {

	i2c@12CB0000 {

arch/arm/boot/dts/exynos5250-snow.dts

+25 −0
Original line number Original line Diff line number Diff line
@@ -16,6 +16,10 @@ 
	model = "Google Snow";

	model = "Google Snow";

	compatible = "google,snow", "samsung,exynos5250";

	compatible = "google,snow", "samsung,exynos5250";





	aliases {

		i2c104 = &i2c_104;

	};



	pinctrl@11400000 {

	pinctrl@11400000 {

		sd3_clk: sd3-clk {

		sd3_clk: sd3-clk {

			samsung,pin-drv = <0>;

			samsung,pin-drv = <0>;
@@ -44,6 +48,27 @@ 
		};

		};

	};

	};





	i2c-arbitrator {

		compatible = "i2c-arb-gpio-challenge";

		#address-cells = <1>;

		#size-cells = <0>;



		i2c-parent = <&{/i2c@12CA0000}>;



		our-claim-gpio = <&gpf0 3 1>;

		their-claim-gpios = <&gpe0 4 1>;

		slew-delay-us = <10>;

		wait-retry-us = <3000>;

		wait-free-us = <50000>;



		/* Use ID 104 as a hint that we're on physical bus 4 */

		i2c_104: i2c@0 {

			reg = <0>;

			#address-cells = <1>;

			#size-cells = <0>;

		};

	};



	/*

	/*

	 * On Snow we've got SIP WiFi and so can keep drive strengths low to

	 * On Snow we've got SIP WiFi and so can keep drive strengths low to

	 * reduce EMI.

	 * reduce EMI.