Hello Rob,

On Fri, Sep 09, 2011 at 12:14:22AM -0500, Rob Herring wrote:

quoted

+i2c@83fc4000 { /* I2C2 on i.MX51 */
+	compatible = "fsl,imx51-i2c", "fsl,imx1-i2c";
+	reg = <0x83fc4000 0x4000>;
+	interrupts = <63>;
+};
+
+i2c@70038000 { /* HS-I2C on i.MX51 */

The mainline driver doesn't support the HS-I2C block does it?

The high speed and "old" i2c blocks on MX51 are basically different
blocks, so the compatible property should be different.

I stumbled about that recently, too and found in
arch/arm/plat-mxc/devices/platform-imx-i2c.c that the third device
description for imx51 is a normal "imx-i2c" one using
MX51_HSI2C_DMA_BASE_ADDR. So I concluded it's different but compatible.

board-mx51_babbage.c uses imx51_add_hsi2c but doesn't add a bus
description. So It might not attract attention if the driver doesn't
match the device.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |