Re: [PATCH V3 1/2] tps6507x-ts: Add DT support

[Grant Likely]

On Tue, 21 May 2013 14:24:17 +0530, "Vishwanathrao Badarkhe, Manish" <manishv.b@xxxxxx> wrote:
> Add device tree based support for TI's tps6507x touchscreen.
> 
> Tested on da850-evm.
> 
> Signed-off-by: Vishwanathrao Badarkhe, Manish <manishv.b@xxxxxx>
> ---
> Changes since V2:
>  - Removed unnecessary code.
>  - Updated Documentation to provide proper names of
>    devicetree properties.
> 
> Changes since V1:
>  - Updated documentation to specify tps6507x as multifunctional
>    device.
>  - return proper error value in absence of platform and DT
>    data for touchscreen.
>  - Updated commit message.
> 
> :100755 100755 8fffa3c... 65ee2cd... M	Documentation/devicetree/bindings/mfd/tps6507x.txt
> :100644 100644 65e0f9a... 89232ee... M	drivers/input/touchscreen/tps6507x-ts.c
>  Documentation/devicetree/bindings/mfd/tps6507x.txt |   28 ++++++-

Binding looks fine to me.

Acked-by: Grant Likely <grant.likely@xxxxxxxxxxxx>

g.

>  drivers/input/touchscreen/tps6507x-ts.c            |   98 ++++++++++++++------
>  2 files changed, 95 insertions(+), 31 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/tps6507x.txt b/Documentation/devicetree/bindings/mfd/tps6507x.txt
> index 8fffa3c..65ee2cd 100755
> --- a/Documentation/devicetree/bindings/mfd/tps6507x.txt
> +++ b/Documentation/devicetree/bindings/mfd/tps6507x.txt
> @@ -1,4 +1,8 @@
> -TPS6507x Power Management Integrated Circuit
> +TPS6507x Multifunctional Device.
> +
> +Features provided by TPS6507x:
> +        1.Power Management Integrated Circuit.
> +        2.Touch-Screen.
>  
>  Required properties:
>  - compatible: "ti,tps6507x"
> @@ -23,6 +27,12 @@ Required properties:
>         vindcdc1_2-supply: VDCDC1 and VDCDC2 input.
>         vindcdc3-supply  : VDCDC3 input.
>         vldo1_2-supply   : VLDO1 and VLDO2 input.
> +- tsc: This node specifies touch screen data.
> +	ti,poll-period : Time at which touch input is getting sampled in ms.
> +	ti,min-pressure: Minimum pressure value to trigger touch.
> +	ti,vref	       : voltage reference for ADC.
> +		      0: Reference voltage for ADC is disabled.
> +		      1: Reference voltage for ADC is enabled.
>  
>  Regulator Optional properties:
>  - defdcdc_default: It's property of DCDC2 and DCDC3 regulators.
> @@ -30,6 +40,14 @@ Regulator Optional properties:
>  			1: If defdcdc pin of DCDC2/DCDC3 is driven HIGH.
>    If this property is not defined, it defaults to 0 (not enabled).
>  
> +Touchscreen Optional properties:
> +- ti,vendor : Touchscreen vendor id to populate
> +	      in sysclass interface.
> +- ti,product: Touchscreen product id to populate
> +	      in sysclass interface.
> +- ti,version: Touchscreen version id to populate
> +	      in sysclass interface.
> +
>  Example:
>  
>  	pmu: tps6507x@48 {
> @@ -88,4 +106,12 @@ Example:
>  			};
>  		};
>  
> +		tsc {
> +			ti,poll-period = <30>;
> +			ti,min-pressure = <0x30>;
> +			ti,vref = <0>;
> +			ti,vendor = <0>;
> +			ti,product = <65070>;
> +			ti,version = <0x100>;
> +		};
>  	};
> diff --git a/drivers/input/touchscreen/tps6507x-ts.c b/drivers/input/touchscreen/tps6507x-ts.c
> index 65e0f9a..89232ee 100644
> --- a/drivers/input/touchscreen/tps6507x-ts.c
> +++ b/drivers/input/touchscreen/tps6507x-ts.c
> @@ -21,6 +21,8 @@
>  #include <linux/mfd/tps6507x.h>
>  #include <linux/input/tps6507x-ts.h>
>  #include <linux/delay.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>  
>  #define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
>  #define TPS_DEFAULT_MIN_PRESSURE 0x30
> @@ -231,36 +233,76 @@ done:
>  	ret = tps6507x_adc_standby(tsc);
>  }
>  
> +static int tsc_init_data(struct tps6507x_dev *tps6507x_dev,
> +		struct input_dev *input_dev)
> +{
> +	struct device_node *node = tps6507x_dev->dev->of_node;
> +	struct tps6507x_board *tps_board =
> +		(struct tps6507x_board *)tps6507x_dev->dev->platform_data;
> +	struct touchscreen_init_data *init_data = NULL;
> +	int err;
> +
> +	if (node)
> +		node = of_find_node_by_name(node, "tsc");
> +	if (tps_board)
> +		init_data = tps_board->tps6507x_ts_init_data;
> +
> +	if (node == NULL || init_data == NULL) {
> +		err = -EINVAL;
> +		goto error_ret;
> +	} else if (init_data) {
> +		tps6507x_dev->ts->poll_period = init_data->poll_period;
> +		tps6507x_dev->ts->min_pressure = init_data->min_pressure;
> +		tps6507x_dev->ts->vref = init_data->vref;
> +		input_dev->id.vendor = init_data->vendor;
> +		input_dev->id.product = init_data->product;
> +		input_dev->id.version = init_data->version;
> +	} else if (node) {
> +		err = of_property_read_u32(node, "ti,poll-period",
> +					(u32 *)&tps6507x_dev->ts->poll_period);
> +		if (err < 0)
> +			goto error_ret;
> +
> +		err = of_property_read_u16(node, "ti,min-pressure",
> +					&tps6507x_dev->ts->min_pressure);
> +		if (err < 0)
> +			goto error_ret;
> +
> +		err = of_property_read_u32(node, "ti,vref",
> +					&tps6507x_dev->ts->vref);
> +		if (err < 0)
> +			goto error_ret;
> +
> +		err = of_property_read_u16(node, "ti,vendor",
> +					&input_dev->id.vendor);
> +		if (err < 0)
> +			goto error_ret;
> +
> +		err = of_property_read_u16(node, "ti,product",
> +					&input_dev->id.product);
> +		if (err < 0)
> +			goto error_ret;
> +
> +		err = of_property_read_u16(node, "ti,version",
> +					&input_dev->id.version);
> +		if (err < 0)
> +			goto error_ret;
> +	}
> +
> +	return 0;
> +
> +error_ret:
> +	return err;
> +}
> +
>  static int tps6507x_ts_probe(struct platform_device *pdev)
>  {
>  	int error;
>  	struct tps6507x_ts *tsc;
>  	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
> -	struct touchscreen_init_data *init_data;
>  	struct input_dev *input_dev;
> -	struct tps6507x_board *tps_board;
>  	int schd;
>  
> -	/**
> -	 * tps_board points to pmic related constants
> -	 * coming from the board-evm file.
> -	 */
> -
> -	tps_board = (struct tps6507x_board *)tps6507x_dev->dev->platform_data;
> -
> -	if (!tps_board) {
> -		dev_err(tps6507x_dev->dev,
> -			"Could not find tps6507x platform data\n");
> -		return -EIO;
> -	}
> -
> -	/**
> -	 * init_data points to array of regulator_init structures
> -	 * coming from the board-evm file.
> -	 */
> -
> -	init_data = tps_board->tps6507x_ts_init_data;
> -
>  	tsc = devm_kzalloc(&pdev->dev, sizeof(struct tps6507x_ts), GFP_KERNEL);
>  	if (!tsc) {
>  		dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
> @@ -301,14 +343,10 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
>  
>  	INIT_DELAYED_WORK(&tsc->work, tps6507x_ts_handler);
>  
> -	if (init_data) {
> -		tsc->poll_period = init_data->poll_period;
> -		tsc->vref = init_data->vref;
> -		tsc->min_pressure = init_data->min_pressure;
> -		input_dev->id.vendor = init_data->vendor;
> -		input_dev->id.product = init_data->product;
> -		input_dev->id.version = init_data->version;
> -	} else {
> +	error = tsc_init_data(tps6507x_dev, input_dev);
> +
> +	if (error) {
> +		dev_warn(&pdev->dev, "Use default platform data\n");
>  		tsc->poll_period = TSC_DEFAULT_POLL_PERIOD;
>  		tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE;
>  	}
> -- 
> 1.7.4.1
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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