linux-kernel - Re: [PATCH] iio:light:tsl2563: Add DT support

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Date:	Thu, 24 Oct 2013 09:29:42 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Sebastian Reichel <sre@...ian.org>,
	Sebastian Reichel <sre@...g0.de>, linux-iio@...r.kernel.org
CC:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Jonathan Cameron <jic23@....ac.uk>,
	Peter Meerwald <pmeerw@...erw.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bill Pemberton <wfp5p@...ginia.edu>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jon Brenner - TAOS <jbrenner@...sinc.com>
Subject: Re: [PATCH] iio:light:tsl2563: Add DT support

On 10/23/13 22:51, Sebastian Reichel wrote:
> Add Device Tree support for the TSL2563 driver
> and document the binding.
> 
> Signed-off-by: Sebastian Reichel <sre@...ian.org>
> ---
>  .../devicetree/bindings/iio/light/tsl2563.txt         | 19 +++++++++++++++++++
>  drivers/iio/light/tsl2563.c                           |  4 ++++
>  2 files changed, 23 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/light/tsl2563.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/light/tsl2563.txt b/Documentation/devicetree/bindings/iio/light/tsl2563.txt
> new file mode 100644
> index 0000000..b52cf4b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/light/tsl2563.txt
> @@ -0,0 +1,19 @@
> +* TAOS TSL2563 ambient light sensor
> +
> +Required properties:
> +
> +  - compatible : should be "taos,tsl2563"
> +  - reg : the I2C address of the sensor
> +
> +Optional properties:
> +
So two options for this one.  Either pitch it as a possible general parameter, or
mark it with a vendor prefix.  It seems like something fairly general, but in that case it
probably needs a more detailed proposal and explanation of exactly what it is.

Also, is taos listed in vendor-prefixes.txt?  Jon, is that the right vendor prefix to use?
I'm guessing you have some non mainline bindings out there already so it would be good
to match those...

> +  - cover-comp-gain : integer used as multiplier for gain
> +                      compensation (default = 1)
> +
> +Example:
> +
> +tsl2563@29 {
> +	compatible = "taos,tsl2563";
> +	reg = <0x29>;
> +	cover-comp-gain = <16>;
> +};
> diff --git a/drivers/iio/light/tsl2563.c b/drivers/iio/light/tsl2563.c
> index ebb962c..bd30b1d 100644
> --- a/drivers/iio/light/tsl2563.c
> +++ b/drivers/iio/light/tsl2563.c
> @@ -699,6 +699,7 @@ static int tsl2563_probe(struct i2c_client *client,
>  	struct iio_dev *indio_dev;
>  	struct tsl2563_chip *chip;
>  	struct tsl2563_platform_data *pdata = client->dev.platform_data;
> +	struct device_node *np = client->dev.of_node;
>  	int err = 0;
>  	u8 id = 0;
>  
> @@ -735,6 +736,9 @@ static int tsl2563_probe(struct i2c_client *client,
>  
>  	if (pdata)
>  		chip->cover_comp_gain = pdata->cover_comp_gain;
> +	else if (np)
> +		of_property_read_u32_index(np, "cover-comp-gain", 0,
> +							&chip->cover_comp_gain);
>  	else
>  		chip->cover_comp_gain = 1;
>  
> 
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