linux-kernel - Re: [PATCH RESEND 6/7] input: ti_am335x

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Message-ID: <20121121183223.GA18950@core.coreip.homeip.net>
Date:	Wed, 21 Nov 2012 10:32:23 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Patil, Rachna" <rachna@...com>
Cc:	linux-doc@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	linux-iio@...r.kernel.org, Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jonathan Cameron <jic23@....ac.uk>
Subject: Re: [PATCH RESEND 6/7] input: ti_am335x_tsc: Add DT support

Hi Rachna,

On Wed, Nov 07, 2012 at 12:22:03PM +0530, Patil, Rachna wrote:
> Add DT support for client touchscreen driver
> 
> Signed-off-by: Patil, Rachna <rachna@...com>
> ---
>  drivers/input/touchscreen/ti_am335x_tsc.c |   60 ++++++++++++++++++++++++-----
>  1 files changed, 50 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index 7a26810..c063cf6 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -26,6 +26,8 @@
>  #include <linux/io.h>
>  #include <linux/input/ti_am335x_tsc.h>
>  #include <linux/delay.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>  
>  #include <linux/mfd/ti_am335x_tscadc.h>
>  
> @@ -398,12 +400,18 @@ static int __devinit titsc_probe(struct platform_device *pdev)
>  	struct titsc *ts_dev;
>  	struct input_dev *input_dev;
>  	struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
> -	struct mfd_tscadc_board	*pdata;
> -	int err;
> -
> -	pdata = tscadc_dev->dev->platform_data;
> -
> -	if (!pdata) {
> +	int err, i;
> +	struct mfd_tscadc_board	*pdata = NULL;
> +	struct device_node *node = NULL;
> +	u32 val32, wires_conf[4];
> +
> +	if (tscadc_dev->dev->of_node) {
> +		node = tscadc_dev->dev->of_node;
> +		node = of_find_node_by_name(node, "tsc");
> +	} else
> +		pdata = tscadc_dev->dev->platform_data;
> +
> +	if (!pdata && !node) {
>  		dev_err(&pdev->dev, "Could not find platform data\n");
>  		return -EINVAL;
>  	}
> @@ -421,11 +429,43 @@ static int __devinit titsc_probe(struct platform_device *pdev)
>  	ts_dev->mfd_tscadc = tscadc_dev;
>  	ts_dev->input = input_dev;
>  	ts_dev->irq = tscadc_dev->irq;
> -	ts_dev->wires = pdata->tsc_init->wires;
> -	ts_dev->x_plate_resistance = pdata->tsc_init->x_plate_resistance;
> -	ts_dev->steps_to_configure = pdata->tsc_init->steps_to_configure;
> -	memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
> +
> +	if (node) {
> +		err = of_property_read_u32(node, "wires", &val32);
> +		if (err < 0)
> +			goto err_free_mem;
> +		else
> +			ts_dev->wires = val32;
> +
> +		err = of_property_read_u32(node, "x-plate-resistance", &val32);
> +		if (err < 0)
> +			goto err_free_mem;
> +		else
> +			ts_dev->x_plate_resistance = val32;
> +
> +		err = of_property_read_u32(node, "steps-to-configure", &val32);
> +		if (err < 0)
> +			goto err_free_mem;
> +		else
> +			ts_dev->steps_to_configure = val32;
> +
> +		err = of_property_read_u32_array(node, "wire-config",
> +				wires_conf, ARRAY_SIZE(wires_conf));
> +		if (err < 0)
> +			goto err_free_mem;
> +		else {
> +			for (i = 0; i < ARRAY_SIZE(wires_conf); i++)
> +				ts_dev->config_inp[i] = wires_conf[i];
> +		}
> +	} else {
> +		ts_dev->wires = pdata->tsc_init->wires;
> +		ts_dev->x_plate_resistance =
> +			pdata->tsc_init->x_plate_resistance;
> +		ts_dev->steps_to_configure =
> +			pdata->tsc_init->steps_to_configure;
> +		memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
>  			sizeof(pdata->tsc_init->wire_config));

I believe if platform data is supplied it should take precedence over DT
data so that parameters can be adjusted if really needed.

> +	}
>  
>  	err = request_irq(ts_dev->irq, titsc_irq,
>  			  0, pdev->dev.driver->name, ts_dev);
> -- 
> 1.7.0.4
> 
> 

Thanks.

-- 
Dmitry
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