linux-kernel - Re: [PATCH v4 4/8] i2c: Make I2C ID tables non-mandatory for DT'ed devices

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Date:	Fri, 11 Sep 2015 10:31:14 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Kieran Bingham <kieranbingham@...il.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linus.walleij@...aro.org, grant.likely@...aro.org
Subject: Re: [PATCH v4 4/8] i2c: Make I2C ID tables non-mandatory for DT'ed
 devices

On Wed, 09 Sep 2015, Kieran Bingham wrote:

> From: Lee Jones <lee.jones@...aro.org>
> 
> 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 DT match tables
> instead.
> 
> Acked-by: Grant Likely <grant.likely@...aro.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

SoB?

> ---
>  drivers/i2c/i2c-core.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 94ca76e..2ebc64d 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -468,7 +468,7 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
>  
>  
>  	/* Attempt an OF style match */
> -	if (of_driver_match_device(dev, drv))
> +	if (i2c_of_match_device(drv->of_match_table, client))
>  		return 1;
>  
>  	/* Then ACPI style match */
> @@ -657,7 +657,15 @@ static int i2c_device_probe(struct device *dev)
>  	}
>  
>  	driver = to_i2c_driver(dev->driver);
> -	if (!driver->probe || !driver->id_table)
> +	if (!driver->probe)
> +		return -EINVAL;
> +
> +	/*
> +	 * An I2C ID table is not mandatory, if and only if, a suitable Device
> +	 * Tree match table entry is supplied for the probing device.
> +	 */
> +	if (!driver->id_table &&
> +	    !i2c_of_match_device(dev->driver->of_match_table, client))
>  		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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