@@ -193,7 +193,8 @@
};
i2c@12CA0000 {
- status = "disabled";
+ samsung,i2c-sda-delay = <100>;
+ samsung,i2c-max-bus-freq = <66000>;
};
i2c@12CB0000 {
@@ -16,6 +16,10 @@
model = "Google Snow";
compatible = "google,snow", "samsung,exynos5250";
+ aliases {
+ i2c104 = &i2c_104;
+ };
+
pinctrl@11400000 {
sd3_clk: sd3-clk {
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
* reduce EMI.
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@chromium.org> --- Changes in v5: - Adjust bindings as per Wolfram Sang. Changes in v4: - Changed mux gpio syntax to work atop Thomas's "ARM: dts: add pin state information in client nodes for Exynos5 platforms"; avoid adding gpios property to i2c@12CA0000 for the same reason. Changes in v3: None 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 | 3 ++- arch/arm/boot/dts/exynos5250-snow.dts | 25 +++++++++++++++++++++++++ 2 files changed, 27 insertions(+), 1 deletion(-)