[PATCH v2 2/3] ARM: dts: Add i2c-arbitrator bus for exynos5250-snow

[Doug Anderson]

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: Doug Anderson <dianders at chromium.org>
---
Changes in v2:
- Use new device tree property names / compatible string.
- Include that the GPIOs for arbitration are active low.

 arch/arm/boot/dts/cros5250-common.dtsi |  5 ++++-
 arch/arm/boot/dts/exynos5250-snow.dts  | 25 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/cros5250-common.dtsi b/arch/arm/boot/dts/cros5250-common.dtsi
index 46c0980..f451375 100644
--- a/arch/arm/boot/dts/cros5250-common.dtsi
+++ b/arch/arm/boot/dts/cros5250-common.dtsi
@@ -58,7 +58,10 @@
 	};
 
 	i2c at 12CA0000 {
-		status = "disabled";
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <66000>;
+		gpios = <&gpa2 0 3 3 0>,
+			<&gpa2 1 3 3 0>;
 	};
 
 	i2c at 12CB0000 {
diff --git a/arch/arm/boot/dts/exynos5250-snow.dts b/arch/arm/boot/dts/exynos5250-snow.dts
index 17dd951..d2d4b48 100644
--- a/arch/arm/boot/dts/exynos5250-snow.dts
+++ b/arch/arm/boot/dts/exynos5250-snow.dts
@@ -16,6 +16,10 @@
 	model = "Google Snow";
 	compatible = "google,snow", "samsung,exynos5250";
 
+	aliases {
+		i2c104 = &i2c_104;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 
@@ -29,6 +33,27 @@
 		};
 	};
 
+	i2c-arbitrator {
+		compatible = "i2c-arbitrator-cros-ec";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		i2c-parent = <&{/i2c at 12CA0000}>;
+
+		ap-claim-gpio = <&gpf0 3 1 0x10000 0>;
+		ec-claim-gpio = <&gpe0 4 0 0x10003 0>;
+		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 at 0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+
 	/*
 	 * On Snow we've got SIP WiFi and so can keep drive strengths low to
 	 * reduce EMI.
-- 
1.8.1