[U-Boot-Users] I2C scanning

[Yasothabalan Ramaswamy-TLS,Chennai]

I am able to switch between both the buses, by CONFIG_I2C_MODULE to 1 or
2.

#if (CFG_I2C_MODULE == 2)
#define I2C_BASE    MPC5XXX_I2C2
#elif (CFG_I2C_MODULE == 1)
#define I2C_BASE    MPC5XXX_I2C1
#else
#error CFG_I2C_MODULE is not properly configured
#endif

But my problem is I have to scan both the buses dynamically in the run
time.


Regards,
Yasotha Balan R
Member Technical Staff - HPEG
HCL Technologies Ltd.
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-----Original Message-----
From: Ben Warren [mailto:bwarren at qstreams.com] 
Sent: Monday, October 22, 2007 8:27 PM
To: Yasothabalan Ramaswamy-TLS,Chennai
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] I2C scanning

Yasothabalan,

Yasothabalan Ramaswamy-TLS,Chennai wrote:
>
> Hi all,
>
>  
>
> I am using MPC5200B CPU.
>
>  
>
> I am using both the I2C buses present as defined below,
>
>  
>
> #define MPC5XXX_I2C1              (CFG_MBAR + 0x3D00)
>
> #define MPC5XXX_I2C2              (CFG_MBAR + 0x3D40)
>
>  
>
> Is it possible to scan both the buses in the run time and do 
> read/write operation?
>
>  
>
> I am here able to scan only one bus.
>
>  
>
> How can I fix this issue?
>
>  
>
I don't know anything about this CPU, but the following code in 
cpu/mpc5xxx/i2c.c makes me think you can't use both I2C buses on this
chip:

#if (CFG_I2C_MODULE == 2)
#define I2C_BASE    MPC5XXX_I2C2
#elif (CFG_I2C_MODULE == 1)
#define I2C_BASE    MPC5XXX_I2C1
#else
#error CFG_I2C_MODULE is not properly configured
#endif

If, however, this chip shares the same I2C controller  as the MPC8xxx 
chips (I have no idea if it does or doesn't), with a little Makefile 
magic you could use the fsl_i2c.c driver, which supports multiple buses.

regards,
Ben




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