[PATCH v5] gpio: pcf857x: Add OF support
archit at ti.com
Tue Aug 27 04:30:24 EDT 2013
On Tuesday 27 August 2013 01:44 PM, Tomasz Figa wrote:
> Hi Laurent,
> On Tuesday 27 of August 2013 10:02:39 Laurent Pinchart wrote:
>> Add DT bindings for the pcf857x-compatible chips and parse the device
>> tree node in the driver.
>> Signed-off-by: Laurent Pinchart
>> <laurent.pinchart+renesas at ideasonboard.com> ---
>> .../devicetree/bindings/gpio/gpio-pcf857x.txt | 71
>> ++++++++++++++++++++++ drivers/gpio/gpio-pcf857x.c
>> | 44 +++++++++++--- 2 files changed, 107 insertions(+), 8
>> create mode 100644
>> Changes since v4:
>> - Don't try to get ngpio from of_device_id data, we already get it from
> Hmm, I'm not sure how this is supposed to work.
> How does the I2C core resolve OF compatible name to particular entry in
> id_table? I believe it simply passes NULL as the second argument of
> .probe() if the device is instantiated based on OF compatible string and
> not one in the legacy ID table.
It doesn't pass the second argument as NULL. If you look at
i2c_device_probe() in drivers/i2c/i2c-core.c, the second argument to
probe is passed as: i2c_match_id(driver->id_table, client)
This will extract the i2c_device_id pointer from the id_table.
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