linux-kernel - RE: [PATCH 2/2] i2c: s3c2410: Get the i2c bus number from alias id

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Date:	Wed, 21 Nov 2012 18:43:15 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Doug Anderson' <dianders@...omium.org>,
	linux-samsung-soc@...r.kernel.org
Cc:	linux-i2c@...r.kernel.org, 'Olof Johansson' <olof@...om.net>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Padmavathi Venna' <padma.v@...sung.com>,
	'Ben Dooks' <ben-linux@...ff.org>,
	'Wolfram Sang' <w.sang@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH 2/2] i2c: s3c2410: Get the i2c bus number from alias id

Doug Anderson wrote:
> 
> From: Padmavathi Venna <padma.v@...sung.com>
> 
> Get the i2c bus number that the device is connected to using the alias
> id.  This makes debugging / grokking of kernel messages much easier.
> 
> [dianders: slight patch cleanup from Padmavathi's original.]
> 
> Signed-off-by: Padmavathi Venna <padma.v@...sung.com>
> Signed-off-by: Doug Anderson <dianders@...omium.org>

Acked-by: Kukjin Kim <kgene.kim@...sung.com>

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@...sung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.

> ---
>  drivers/i2c/busses/i2c-s3c2410.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-
> s3c2410.c
> index 3e0335f..ca43590 100644
> --- a/drivers/i2c/busses/i2c-s3c2410.c
> +++ b/drivers/i2c/busses/i2c-s3c2410.c
> @@ -899,11 +899,19 @@ static void
>  s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
>  {
>  	struct s3c2410_platform_i2c *pdata = i2c->pdata;
> +	int id;
> 
>  	if (!np)
>  		return;
> 
> -	pdata->bus_num = -1; /* i2c bus number is dynamically assigned */
> +	id = of_alias_get_id(np, "i2c");
> +	if (id < 0) {
> +		dev_warn(i2c->dev, "failed to get alias id:%d\n", id);
> +		pdata->bus_num = -1;
> +	} else {
> +		/* i2c bus number is statically assigned from alias */
> +		pdata->bus_num = id;
> +	}
>  	of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata-
> >sda_delay);
>  	of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata-
> >slave_addr);
>  	of_property_read_u32(np, "samsung,i2c-max-bus-freq",
> --
> 1.7.7.3

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