[U-Boot] [beagleboard] Re: TI:OMAP: [PATCH 2/7] Enable I2C bus switching

[Dirk Behme <dirk.behme@googlemail.com>]

On 08.02.2010 08:01, Syed Mohammed, Khasim wrote:
> On Sun, Feb 7, 2010 at 12:02 PM, Ben Warren<biggerbadderben@gmail.com>  wrote:
>> Dirk,
>>
>> On 2/5/2010 11:30 PM, Dirk Behme wrote:
>>>
>>> On 24.01.2010 01:05, Tom wrote:
>>>
>>>>
>>>> Khasim Syed Mohammed wrote:
>>>>
>>>>>
>>>>>    From 9bb1c3501c8f098dac6e224c99e409ebf92b0ab9 Mon Sep 17 00:00:00 2001
>>>>> From: Syed Mohammed Khasim<khasim@ti.com>
>>>>> Date: Mon, 18 Jan 2010 18:11:14 +0530
>>>>> Subject: [PATCH] Enable I2C bus switching
>>>>>
>>>>> OMAP3 supports Multiple I2C channels, this patch allows
>>>>> us to use i2c dev<bus no>     command to switch between busses.
>>>>>
>>>>> Signed-off-by: Syed Mohammed Khasim<khasim@ti.com>
>>>>> Acked-by: Heiko Schocher<hs@denx.de>
>>>>> ---
>>>>>    drivers/i2c/omap24xx_i2c.c     |    5 +++++
>>>>>    include/configs/omap3_beagle.h |    6 ++++++
>>>>>    2 files changed, 11 insertions(+), 0 deletions(-)
>>>>>
>>>>> diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
>>>>> index ff18991..e8c8184 100644
>>>>> --- a/drivers/i2c/omap24xx_i2c.c
>>>>> +++ b/drivers/i2c/omap24xx_i2c.c
>>>>> @@ -435,3 +435,8 @@ int i2c_set_bus_num(unsigned int bus)
>>>>>
>>>>>         return 0;
>>>>>    }
>>>>> +
>>>>> +int i2c_get_bus_num(void)
>>>>> +{
>>>>> +       return (int) current_bus;
>>>>> +}
>>>>> diff --git a/include/configs/omap3_beagle.h
>>>>> b/include/configs/omap3_beagle.h
>>>>> index a8abb0e..4d516a4 100644
>>>>> --- a/include/configs/omap3_beagle.h
>>>>> +++ b/include/configs/omap3_beagle.h
>>>>> @@ -100,6 +100,12 @@
>>>>>    /* DDR - I use Micron DDR */
>>>>>    #define CONFIG_OMAP3_MICRON_DDR              1
>>>>>
>>>>> +/* Enable Multi Bus support for I2C */
>>>>> +#define CONFIG_I2C_MULTI_BUS           1
>>>>> +
>>>>> +/* Probe all devices */
>>>>> +#define CONFIG_SYS_I2C_NOPROBES                {0x0, 0x0}
>>>>>
>>>>
>>>> Most/All of the configs I reviewed set the addr element
>>>> to a valid address.  I do not believe 0 is a valid address
>>>> on omap.  If the intent is a double negative
>>>> {0, 0} == probe all
>>>> Then add a comment.
>>>>
>>>
>>> I would fix this, but I have no idea what to add :( Any hint?
>>>
>>>
>>
>> CONFIG_SYS_I2C_NOPROBES doesn't have to be defined.  It's there as a
>> convenience in case there are devices that you don't want to be included
>> when probing the bus.  If there's nothing you want to skip, don't define it.
>>>
>
> With out this option enabled it fails to compile for Multi bus I2C support

Hmm, I removed CONFIG_SYS_I2C_NOPROBES as proposed by Ben and I 
haven't observed any warning compiling my three patches

http://lists.denx.de/pipermail/u-boot/2010-February/067541.html

> More over, this patch is already accepted and has nothing more to do.

I'm not sure, but there seems to be a compilation warning in 2/7 or 
3/7. At least in the unmodified ones. The three patches I sent (see 
above) are compiling fine now, though.

Best regards

Dirk