TQM5200 I2C Second bus

TQM5200 I2C Second bus

[Jani.Sarkijarvi]

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Hi,

I'm using TQM5200 (MPC5200) chip with linux-2.6-denx. Problem is to get second I2c bus to work (/dev/i2c-0) . /dev/i2c-1 seems to be internal bus and I can read ex. lm75 temperature sensor, also I can see traffic in oscilloscope (only error is "I2C: No RXAK", but it seems to be working). My .dts setup is:


 i2c@3d00 {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        compatible = "fsl,mpc5200-i2c","fsl-i2c";
                        reg = <0x3d00 0x40>; // mapped to /dev/i2c-0
                        cell-index = <0>;
                        interrupts = <2 16 0>; //neather <2 15 0> is not working says: I2C: MAL
                        interrupt-parent = <&mpc5200_pic>;
                        fsl5200-clocking;

                };

                i2c@3d40 {
                        #address-cells = <1>;
                        #size-cells = <0>; // mapped to /dev/i2c-1
                        compatible = "fsl,mpc5200-i2c","fsl-i2c";
                        reg = <0x3d40 0x40>;
                        cell-index = <1>;
                        interrupts = <2 16 0>;
                        interrupt-parent = <&mpc5200_pic>;
                        fsl5200-clocking;
                        rtc@68 {
                                device_type = "rtc";
                                compatible = "dallas,ds1307";
                                reg = <0x68>;
                        };

                };

And kernel says in boot:
[    1.270973] i2c /dev entries driver
[    1.275664] i2c-core: driver [dev_driver] registered
[    1.276395] i2c-adapter i2c-0: adapter [MPC adapter] registered
[    1.277066] i2c-dev: adapter [MPC adapter] registered as minor 0
[    1.277802] i2c-adapter i2c-1: adapter [MPC adapter] registered
[    1.277975] i2c 1-0068: uevent
[    1.278415] i2c-adapter i2c-1: client [ds1307] registered with bus id 1-0068
[    1.279042] i2c-dev: adapter [MPC adapter] registered as minor 1


And:
# ls -la /dev/i2c-*
crwxrwxrwx  1 root root 89, 0 Aug 13  2008 /dev/i2c-0
crwxrwxrwx  1 root root 89, 1 Aug 14  2008 /dev/i2c-1
#

If I try read something from /dev/i2c-0, it says:
# dmesg
[ 2628.107343] i2c-adapter i2c-0: ioctl, cmd=0x703, arg=0x01
[ 2628.107880] i2c-dev: i2c-0 reading 2 bytes.
[ 2628.107934] i2c-adapter i2c-0: master_xfer[0] R, addr=0x01, len=2
[ 2628.107956] Doing read 2 bytes to 0x01 - 1 of 1 messages
[ 2629.105411] I2C: wait timeout

Any ideas?

Best Regards, 
Jani Särkijärvi




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Re: TQM5200 I2C Second bus

[Juergen Beisert]

On Freitag, 19. September 2008, Jani.Sarkijarvi@elektrobit.com wrote:
> Hi,
>
> I'm using TQM5200 (MPC5200) chip with linux-2.6-denx. Problem is to get
> second I2c bus to work (/dev/i2c-0) . /dev/i2c-1 seems to be internal bus
> and I can read ex. lm75 temperature sensor, also I can see traffic in
> oscilloscope (only error is "I2C: No RXAK", but it seems to be working). =
My
> .dts setup is:

Is your "GPS Port Configuration Register" setting correct?

jbe

=2D-=20
Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de
=A0Pengutronix - Linux Solutions for Science and Industry
=A0   Handelsregister: Amtsgericht Hildesheim, HRA 2686
=A0 =A0 =A0    Vertretung Sued/Muenchen, Germany
   Phone: +49-8766-939 228 |  Fax: +49-5121-206917-9

RE: TQM5200 I2C Second bus

[Jani.Sarkijarvi]

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It is very possible that, setting are not right. I found from mpc5200 manual this register: (MBAR + 0x0B00, GPS, GPIO Standard registers). Where should be right place to modify those register?

BR,

Jani Särkijärvi

-----Original Message-----
From: Juergen Beisert [mailto:jbe@pengutronix.de] 
Sent: 19 September 2008 16:58
To: linuxppc-embedded@ozlabs.org
Cc: Särkijärvi, Jani
Subject: Re: TQM5200 I2C Second bus

On Freitag, 19. September 2008, Jani.Sarkijarvi@elektrobit.com wrote:
> Hi,
>
> I'm using TQM5200 (MPC5200) chip with linux-2.6-denx. Problem is to 
> get second I2c bus to work (/dev/i2c-0) . /dev/i2c-1 seems to be 
> internal bus and I can read ex. lm75 temperature sensor, also I can 
> see traffic in oscilloscope (only error is "I2C: No RXAK", but it 
> seems to be working). My .dts setup is:

Is your "GPS Port Configuration Register" setting correct?

jbe

--
Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry
    Handelsregister: Amtsgericht Hildesheim, HRA 2686
         Vertretung Sued/Muenchen, Germany
   Phone: +49-8766-939 228 |  Fax: +49-5121-206917-9


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Please note: This e-mail may contain confidential information
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Re: TQM5200 I2C Second bus

[Grant Likely]

On Tue, Sep 23, 2008 at 05:39:05PM +0300, Jani.Sarkijarvi@elektrobit.com wrote:
>  
> It is very possible that, setting are not right. I found from mpc5200 manual this register: (MBAR + 0x0B00, GPS, GPIO Standard registers). Where should be right place to modify those register?

Ideally, your U-Boot port should set the correct value for port config.
If you are unable to modify U-Boot, then you can clone
arch/powerpc/platform/52xx/mpc5200_simple.c for the tqm5200 board and
put the port_config fixup in there.

arch/powerpc/platform/52xx/lite5200.c exists for the exact same reason.
Look at the lite5200_fix_port_config() function.

g.

> 
> BR,
> 
> Jani Särkijärvi
> 
> -----Original Message-----
> From: Juergen Beisert [mailto:jbe@pengutronix.de] 
> Sent: 19 September 2008 16:58
> To: linuxppc-embedded@ozlabs.org
> Cc: Särkijärvi, Jani
> Subject: Re: TQM5200 I2C Second bus
> 
> On Freitag, 19. September 2008, Jani.Sarkijarvi@elektrobit.com wrote:
> > Hi,
> >
> > I'm using TQM5200 (MPC5200) chip with linux-2.6-denx. Problem is to 
> > get second I2c bus to work (/dev/i2c-0) . /dev/i2c-1 seems to be 
> > internal bus and I can read ex. lm75 temperature sensor, also I can 
> > see traffic in oscilloscope (only error is "I2C: No RXAK", but it 
> > seems to be working). My .dts setup is:
> 
> Is your "GPS Port Configuration Register" setting correct?
> 
> jbe
> 
> --
> Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de
>  Pengutronix - Linux Solutions for Science and Industry
>     Handelsregister: Amtsgericht Hildesheim, HRA 2686
>          Vertretung Sued/Muenchen, Germany
>    Phone: +49-8766-939 228 |  Fax: +49-5121-206917-9
> 
> 
> ----------------------------------------------------------------
> Please note: This e-mail may contain confidential information
> intended solely for the addressee. If you have received this
> e-mail in error, please do not disclose it to anyone, notify
> the sender promptly, and delete the message from your system.
> Thank you.
> 

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