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| author | Doug Anderson <dianders@chromium.org> | 2013-04-16 18:29:01 +0200 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2013-04-28 21:03:53 +0200 |
| commit | 97a4a1ba0eb0c8fd20cabf8a3ca857de9658ee21 (patch) | |
| tree | 0fe6325a3b24e33d667f2780e79f5aec3ff3ffc2 /arch/arm/boot | |
| parent | Merge branch 'exynos/dt' into late/dt (diff) | |
| download | linux-97a4a1ba0eb0c8fd20cabf8a3ca857de9658ee21.tar.xz linux-97a4a1ba0eb0c8fd20cabf8a3ca857de9658ee21.zip | |
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: Doug Anderson <dianders@chromium.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/boot')
| -rw-r--r-- | arch/arm/boot/dts/cros5250-common.dtsi | 3 | ||||
| -rw-r--r-- | arch/arm/boot/dts/exynos5250-snow.dts | 25 |
2 files changed, 27 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/cros5250-common.dtsi b/arch/arm/boot/dts/cros5250-common.dtsi index 8a5b3a6cdc58..0a61bbb9102f 100644 --- a/arch/arm/boot/dts/cros5250-common.dtsi +++ b/arch/arm/boot/dts/cros5250-common.dtsi @@ -193,7 +193,8 @@ }; i2c@12CA0000 { - status = "disabled"; + samsung,i2c-sda-delay = <100>; + samsung,i2c-max-bus-freq = <66000>; }; i2c@12CB0000 { diff --git a/arch/arm/boot/dts/exynos5250-snow.dts b/arch/arm/boot/dts/exynos5250-snow.dts index 581ffae27e13..fa85f58553f5 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; + }; + 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. |