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:	Mon, 02 Jun 2014 17:08:29 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	wsa@...-dreams.de
Cc:	linus.walleij@...aro.org, linux-i2c@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 3/3] i2c: Make I2C ID tables non-mandatory for DT'ed
 and/or ACPI'ed devices

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.

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))
> -- 
> 1.8.3.2
> 

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