Re: Usage of i2c_-Tools in Barebox

From: Sascha Hauer <s.hauer@pengutronix.de>
To: Marcel Behlau <marcel.behlau@elfin.de>
Cc: barebox@lists.infradead.org,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Subject: Re: Usage of i2c_-Tools in Barebox
Date: Fri, 22 May 2015 08:41:08 +0200	[thread overview]
Message-ID: <20150522064108.GS6325@pengutronix.de> (raw)
In-Reply-To: <555C2AEF.206@elfin.de>

On Wed, May 20, 2015 at 08:34:23AM +0200, Marcel Behlau wrote:
> Hi,
> 
> i found the problem. The Pad Mux Register (0x20E008C and 0x20E0090)
> are not initialised. In both registers is a 0x00000005 (reset
> value), instead of 0x00000016. I think, i must specify the value of
> the mux register in the device tree, too. How can i do this?

You have to add a pinctrl node, like this:

&iomuxc {
	imx6s-riotboard {
		pinctrl_i2c1_2: i2c1grp-2 {
			fsl,pins = <
				MX6QDL_PAD_EIM_EB2__I2C2_SCL 0x4001b8b1
				MX6QDL_PAD_EIM_D16__I2C2_SDA 0x4001b8b1
			>;
		};
	};
};

...

&i2c1 {
	pinctrl-0 = <&pinctrl_i2c1_2>;
};

See dts/Bindings/pinctrl/fsl,imx-pinctrl.txt and
dts/Bindings/pinctrl/fsl,imx6q-pinctrl.txt for a documentation what the
0x4001b8b1 value means. In short bit30 is for the SION bit and the
remaing bits are for the PAD_CTL register.

Sascha

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