linux-kernel - Re: [PATCH] ARM:tegra20-colibri-512.dts: Change tristate status for i2c pinmux

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Message-ID: <51C47E41.6050609@wwwdotorg.org>
Date:	Fri, 21 Jun 2013 10:24:33 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Lucas Stach <dev@...xeye.de>
CC:	Anna-Maria Gleixner <anna-maria@...-um.de>,
	linux-tegra@...r.kernel.org, Joseph Lo <josephl@...dia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM:tegra20-colibri-512.dts: Change tristate status for
 i2c pinmux

On 06/20/2013 03:08 PM, Anna-Maria Gleixner wrote:
> The nvidia,tristate entry for the pinmux of i2c1 an i2c3 was set to
> tristate. This results in non working i2c, because the i2c pins are
> not actively driven. Set the entries to "driven".

Lucas, can you please comment on this patch? It sounds correct to me,
but I would have assumed you'd tested I2C already when you wrote the
original DT?

Oh actually, now that I look further, I see that tegra20-iris-512.dts
includes this file, and overrides some of the tristate values there.
What's the thinking behind that, and does this patch fit into it?

> diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi

>                  nvidia,pins = "rm";
>                  nvidia,function = "i2c1";
>                  nvidia,pull = <0>;
> -                nvidia,tristate = <1>;
> +                nvidia,tristate = <0>;
>              };
>              i2c3 {
>                  nvidia,pins = "dtf";
>                  nvidia,function = "i2c3";
>                  nvidia,pull = <0>;
> -                nvidia,tristate = <1>;
> +                nvidia,tristate = <0>;
>              };
>              i2cddc {
>                  nvidia,pins = "ddc";

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