linux-kernel - Re: [PATCHv6 07/11] i2c: match dt-style device names from sysfs interface

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Date:   Wed, 26 Oct 2016 09:55:36 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Kieran Bingham <kieran@...uared.org.uk>
Cc:     Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Javier Martinez Canillas <javier@....samsung.com>,
        sameo@...ux.intel.com
Subject: Re: [PATCHv6 07/11] i2c: match dt-style device names from sysfs
 interface

On Tue, 25 Oct 2016, Kieran Bingham wrote:

> A user can choose to instantiate a device on an i2c bus using the sysfs
> interface by providing a string and address to match and communicate
> with the device on the bus. Presently this string is only matched
> against the old i2c device id style strings, even in the presence of
> full device tree compatible strings with vendor prefixes.
> 
> Providing a vendor-prefixed string to the sysfs interface will not match
> against the device tree of_match_device() calls as there is no device
> tree node to parse from the sysfs interface.
> 
> Convert i2c_of_match_device_strip_vendor() such that it can match both
> vendor prefixed and stripped compatible strings on the sysfs interface.
> 
> Signed-off-by: Kieran Bingham <kieran@...gham.xyz>

Acked-by: Lee Jones <lee.jones@...aro.org>

> ---
>  drivers/i2c/i2c-core.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 2003334b5246..01bce56f733a 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1692,6 +1692,16 @@ i2c_of_match_device_strip_vendor(const struct of_device_id *matches,
>  	const char *name;
>  
>  	for (; matches->compatible[0]; matches++) {
> +		/*
> +		 * Adding devices through the i2c sysfs interface provides us
> +		 * a string to match which may be compatible with the device
> +		 * tree compatible strings, however with no actual of_node the
> +		 * of_match_device() will not match
> +		 */
> +		if (!strncasecmp(client->name, matches->compatible,
> +				strlen(matches->compatible)))
> +			return matches;
> +
>  		name = strchr(matches->compatible, ',');
>  		if (!name)
>  			name = matches->compatible;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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