Hi,
Shawn Guo writes:
> On Fri, Sep 09, 2011 at 09:18:45AM +0200, Uwe Kleine-König wrote:
> > Hello Rob,
> >
> > On Fri, Sep 09, 2011 at 12:14:22AM -0500, Rob Herring wrote:
> > > > +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.
> >
> Aha, I was confused by the platform codes. Will drop HSI2C.
>
According to the i.MX51 Ref. Manual it's so buggy that it should not even
be used:
|Chapter 39
|High Speed Inter IC (HS-I2C)
|39.1 Introduction
[...]
| NOTE
|Due to limited functionality, Freescale does not recommend users
|incorporate the HS-I2C module in future designs. For details on the
|limitations, refer to the MX51 IC Errata. Users should consider using the
|two standard I2C modules, which have no errata.
Fortunately there is an i2c-gpio driver that can be used on the
corresponding pins. ;-)
Lothar Waßmann
--
___________________________________________________________
Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen
Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10
Geschäftsführer: Matthias Kaussen
Handelsregistereintrag: Amtsgericht Aachen, HRB 4996
www.karo-electronics.de | info@xxxxxxxxxxxxxxxxxxx
___________________________________________________________
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
