linux-kernel - Re: [PATCH 3/3] i2c: Make I2C ID tables non-mandatory for DT'ed and/or ACPI'ed devices

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Date:	Tue, 03 Jun 2014 10:18:32 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	wsa@...-dreams.de, linus.walleij@...aro.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH 3/3] i2c: Make I2C ID tables non-mandatory for DT'ed
 and/or ACPI'ed devices

On Tue, 3 Jun 2014 09:11:09 +0100, Lee Jones <lee.jones@...aro.org> wrote:
> On Mon, 02 Jun 2014, Grant Likely wrote:
> > On Mon,  2 Jun 2014 14:41:03 +0100, Lee Jones <lee.jones@...aro.org> wrote:
> > > Currently the I2C framework insists on devices supplying an I2C ID
> > > table.  Many of the devices which do so unnecessarily adding quite a
> > > few wasted lines to kernel code.  This patch allows drivers a means
> > > to 'not' supply the aforementioned table and match on either DT
> > > and/or ACPI match tables instead.
> > > 
> > > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > 
> > Looks reasonable.
> 
> Can I add your Ack?

Acked-by: Grant Likely <grant.likely@...aro.org>

> 
> > g.
> > 
> > > ---
> > >  drivers/i2c/i2c-core.c | 13 ++++++++++++-
> > >  1 file changed, 12 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> > > index d0c7180..811b78f 100644
> > > --- a/drivers/i2c/i2c-core.c
> > > +++ b/drivers/i2c/i2c-core.c
> > > @@ -271,7 +271,18 @@ static int i2c_device_probe(struct device *dev)
> > >  		return 0;
> > >  
> > >  	driver = to_i2c_driver(dev->driver);
> > > -	if (!driver->probe || !driver->id_table)
> > > +	if (!driver->probe)
> > > +		return -EINVAL;
> > > +
> > > +	/*
> > > +	 * An I2C ID table is not madatory, if and only if, a suitable Device
> > > +	 * Tree and/or ACPI match table entry is supplied for the probing
> > > +	 * device.
> > > +	 *
> > > +	 * TODO: Provide 'device type' to 'ACPI node' call and match here.
> > > +	 */
> > > +	if (!driver->id_table &&
> > > +	    !of_match_device(dev->driver->of_match_table, dev))
> > >  		return -ENODEV;
> > >  
> > >  	if (!device_can_wakeup(&client->dev))
> > 
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

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