From: Doug Anderson <dianders@chromium.org> To: Wolfram Sang <w.sang@pengutronix.de> Cc: Simon Glass <sjg@chromium.org>, Naveen Krishna Chatradhi <ch.naveen@samsung.com>, Grant Likely <grant.likely@secretlab.ca>, Yuvaraj Kumar <yuvaraj.cd@gmail.com>, Ben Dooks <ben.dooks@codethink.co.uk>, u.kleine-koenig@pengutronix.de, Mark Brown <broonie@opensource.wolfsonmicro.com>, Girish Shivananjappa <girish.shivananjappa@linaro.org>, bhushan.r@samsung.com, sreekumar.c@samsung.com, Prashanth G <prashanth.g@samsung.com>, Olof Johansson <olof@lixom.net>, Daniel Kurtz <djkurtz@chromium.org>, Grant Grundler <grundler@chromium.org>, Doug Anderson <dianders@chromium.org>, Russell King <linux@arm.linux.org.uk>, Kukjin Kim <kgene.kim@samsung.com>, Rahul Sharma <rahul.sharma@samsung.com>, Thomas Abraham <thomas.abraham@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 2/4] ARM: dts: Add i2c-arbitrator bus for exynos5250-snow Date: Wed, 13 Feb 2013 10:02:10 -0800 [thread overview] Message-ID: <1360778532-7480-2-git-send-email-dianders@chromium.org> (raw) In-Reply-To: <1360778532-7480-1-git-send-email-dianders@chromium.org> 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 v1: None arch/arm/boot/dts/cros5250-common.dtsi | 5 ++++- arch/arm/boot/dts/exynos5250-snow.dts | 24 ++++++++++++++++++++++++ 2 files changed, 28 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@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@12CB0000 { diff --git a/arch/arm/boot/dts/exynos5250-snow.dts b/arch/arm/boot/dts/exynos5250-snow.dts index 17dd951..69a87a0 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 +33,26 @@ }; }; + i2c-arbitrator { + compatible = "i2c-arbitrator"; + #address-cells = <1>; + #size-cells = <0>; + + i2c-parent = <&{/i2c@12CA0000}>; + + bus-arbitration-gpios = <&gpf0 3 1 0 0>, <&gpe0 4 0 3 0>; + bus-arbitration-slew-delay-us = <10>; + bus-arbitration-wait-retry-us = <3000>; + bus-arbitration-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. -- 1.8.1
WARNING: multiple messages have this Message-ID (diff)
From: dianders@chromium.org (Doug Anderson) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v1 2/4] ARM: dts: Add i2c-arbitrator bus for exynos5250-snow Date: Wed, 13 Feb 2013 10:02:10 -0800 [thread overview] Message-ID: <1360778532-7480-2-git-send-email-dianders@chromium.org> (raw) In-Reply-To: <1360778532-7480-1-git-send-email-dianders@chromium.org> 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 v1: None arch/arm/boot/dts/cros5250-common.dtsi | 5 ++++- arch/arm/boot/dts/exynos5250-snow.dts | 24 ++++++++++++++++++++++++ 2 files changed, 28 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..69a87a0 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 +33,26 @@ }; }; + i2c-arbitrator { + compatible = "i2c-arbitrator"; + #address-cells = <1>; + #size-cells = <0>; + + i2c-parent = <&{/i2c@12CA0000}>; + + bus-arbitration-gpios = <&gpf0 3 1 0 0>, <&gpe0 4 0 3 0>; + bus-arbitration-slew-delay-us = <10>; + bus-arbitration-wait-retry-us = <3000>; + bus-arbitration-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
next prev parent reply other threads:[~2013-02-13 18:08 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-02-13 18:02 [PATCH v1 1/4] i2c: mux: Add i2c-arbitrator 'mux' driver Doug Anderson 2013-02-13 18:02 ` Doug Anderson 2013-02-13 18:02 ` Doug Anderson [this message] 2013-02-13 18:02 ` [PATCH v1 2/4] ARM: dts: Add i2c-arbitrator bus for exynos5250-snow Doug Anderson 2013-02-13 21:04 ` Stephen Warren 2013-02-13 21:04 ` Stephen Warren 2013-02-14 0:38 ` Doug Anderson 2013-02-14 0:38 ` Doug Anderson 2013-02-14 4:42 ` Stephen Warren 2013-02-14 4:42 ` Stephen Warren 2013-02-13 18:02 ` [PATCH v1 3/4] ARM: dts: Add sbs-battery " Doug Anderson 2013-02-13 18:02 ` Doug Anderson 2013-02-13 18:02 ` [PATCH v1 4/4] i2c-mux: i2c_add_mux_adapter() should use -1 for auto bus num Doug Anderson 2013-02-13 18:02 ` Doug Anderson 2013-02-13 20:34 ` Guenter Roeck 2013-02-13 20:34 ` Guenter Roeck 2013-02-13 21:09 ` Stephen Warren 2013-02-13 21:09 ` Stephen Warren 2013-02-14 7:15 ` Jean Delvare 2013-02-14 7:15 ` Jean Delvare 2013-02-13 18:45 ` [PATCH v1 1/4] i2c: mux: Add i2c-arbitrator 'mux' driver Olof Johansson 2013-02-13 18:45 ` Olof Johansson 2013-02-13 18:49 ` Olof Johansson 2013-02-13 18:49 ` Olof Johansson 2013-02-13 21:02 ` Stephen Warren 2013-02-13 21:02 ` Stephen Warren [not found] ` <511BFF77.2090202-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-02-14 0:34 ` Doug Anderson [not found] ` <CAD=FV=XUEcUx3NGCm+KijRGujECVTSJ9X5fY=arq-4U_RUdxCQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-14 0:41 ` Stephen Warren [not found] ` <511C32B5.20600-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-02-14 0:54 ` Doug Anderson [not found] ` <CAD=FV=X=BPQo245kAtPvNUgKjypOYnheYJWcBkq6AA19z99V0w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-14 21:40 ` Doug Anderson [not found] ` <CAD=FV=UYEqreNbUAxHydmWH+66pOORMB_uFokivLitsavzTcsQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-14 23:35 ` Stephen Warren [not found] ` <511D74DD.9070600-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-02-14 23:59 ` Doug Anderson [not found] ` <CAD=FV=Uri9O=iuuUKB9nPKW+6C+A_WsqW0sXB2nS5i7+=NtFKA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-15 0:16 ` Stephen Warren [not found] ` <511D7E5D.1030003-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> 2013-02-15 1:14 ` Doug Anderson [not found] ` <CAD=FV=USf_YSzW1ZN2NWZKnLk_LPpnFpxRy=AGVyn_YHjRpKyw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-15 10:26 ` Mark Brown 2013-02-15 10:24 ` Mark Brown [not found] ` <20130215102420.GA22283-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org> 2013-02-15 19:56 ` Linus Walleij [not found] ` <CACRpkdav8WO5yOSLPLtpUCeM41nttrbspRb7YrsqGXJ01ebMhw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-17 16:03 ` Mark Brown 2013-02-15 21:05 ` Doug Anderson 2013-02-14 10:01 ` Linus Walleij [not found] ` <CACRpkdaUtOe9g7+T=cWPepeGae6RcJ1nTeGc9opTijcYzfMedQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-02-14 17:37 ` Stephen Warren
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