Re: [PATCH 2/2] i2c-designware-pci: Index Haswell ULT bus names from 0

[Benson Leung]

Hi Wolfram,

Thank you for the advice. Sorry for the delay in my response.
(sorry for the duplicated message. I neglected to set plain text in my
email editor).

On Fri, Jan 3, 2014 at 7:52 AM, Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
> > I am not sure I get the problem. If you use i2c_register_board_info() to
> > register the known devices on the designware busses the dynamically
> > assigned numbers are guaranteed to be enumarated higer than the static
> > ones. Check drivers/i2c/i2c-boardinfo.c.
>
> Ping. Was this helpful or do you still have the issue?

Our devices and our platforms have some other requirements which
turned me away from using i2c_register_board_info.

i2c_register_board_info looks to create predeclarations for a specific
i2c bus... However, right now, the chromeos_laptop driver is
structured to do explicit declaration (using i2c_new_probed_device)
*after* the busses have come up.

Specifically, we have a class of atmel_mxt i2c touchpad/touchscreen
devices that may appear at different addresses depending on whether
the touch device is in bootloader mode or operational mode.

For that reason, the chromeos_laptop driver uses i2c_new_probed_device
with a list of possible addresses when dealing with the atmel touch
device.

You can see the driver here :
drivers/platform/chrome/chromeos_laptop.c

Is there some way of getting the "probe" behavior while using
i2c_register_board_info?



-- 
Benson Leung
Software Engineer, Chrom* OS
bleung@xxxxxxxxxxxx
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