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

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Message-ID: <CANLzEkvgYQtkEyOMNpPcS9BeYzX3zJn7hvtsyhFzbDpViS8-2Q@mail.gmail.com>
Date:	Thu, 9 Jan 2014 16:12:14 -0800
From:	Benson Leung <bleung@...omium.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	khali@...ux-fr.org, andriy.shevchenko@...ux.intel.com,
	jacmet@...site.dk, linux-i2c@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Duncan Laurie <dlaurie@...omium.org>
Subject: Re: [PATCH 2/2] i2c-designware-pci: Index Haswell ULT bus names from 0

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@...-dreams.de> 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@...omium.org
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