[PATCH v2] gpio: Enable pcf857x GPIO expander for Device Tree

Archit Taneja archit at ti.com
Tue Aug 27 03:00:18 EDT 2013

On Tuesday 27 August 2013 12:17 PM, Laurent Pinchart wrote:
> On Tuesday 27 August 2013 05:20:45 Linus Walleij wrote:
>> On Mon, Aug 26, 2013 at 8:21 AM, Archit Taneja <archit at ti.com> wrote:
>>> Add code to parse the GPIO expander Device Tree node and extract platform
>>> data out of it, and populate the struct 'pcf857x_platform_data'
>>> maintained by the driver. This enables devices to reference the gpio
>>> expander from Device Tree.
>>> Add DT binding info in Documentation.
>>> Signed-off-by: Archit Taneja <archit at ti.com>
>>> ---
>>> - v2 posted after quite a while, sorry for the delay!
>>> Changes in v2:
>>> - second gpeio-cell description corrected in Documentation
>>> - interrupt controller description removed for now, will be added in a
>>>    follow up patch
>>> - n_latch description updated
> And it seems that the patch conflicts with
> https://lkml.org/lkml/2013/8/26/248
> :-/


> If we end up merging this one, I'd like to at least rename the DT n-latch
> property to pin-initial-states as in my patch and update the documentation, as
> I find it more explicit.

I think your patch is cleaner and more descriptive. The only thing which 
I am not clear about in your patch is the extra work done in getting 
ngpio, that should be available in i2c_device_id pointer argument in 
probe(id points to the array pcf857x_id already available in the driver 
with the number of gpios for each chip variant).


More information about the linux-arm-kernel mailing list