[PATCH V2 1/2] tps6507x-ts: Add DT support

[Vishwanathrao Badarkhe, Manish]

Hi Prabhakar,

On Tue, May 07, 2013 at 11:11:21, Prabhakar Lad wrote:
> Hi Manish,
> 
> Thanks for the patch, below are few nits.
> 
> On Sat, May 4, 2013 at 4:42 PM, Vishwanathrao Badarkhe, Manish <manishv.b at ti.com> wrote:
> > Add device tree based support for TI's tps6507x touchscreen.
> [Snip]
> 
> > +- 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.
> For devicetree properties '-' is preferred over '_'.

Ok, I will use '-' hence forward for device tree properties.
> 
> > +       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 poppulate
> > +             in sysclass interface.
> > +- ti,product: Touchscreen product id to poppulate
> > +             in sysclass interface.
> > +- ti,version: Touchscreen version id to poppulate
> > +             in sysclass interface.
> > +
> s/poppulate/populate

Ok, I will correct this.
> 
> >  Example:
> >
> >         pmu: tps6507x at 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..d5433d0 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 +233,83 @@ 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;
> > +       u32 val32;
> > +       int err;
> > +
> > +       if (node)
> > +               node = of_find_node_by_name(node, "tsc");
> > +       if (tps_board)
> > +               init_data = tps_board->tps6507x_ts_init_data;
> > +
> > +       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", 
> > + &val32);
> why not pass tps6507x_dev->ts->poll_period instead of val32 and similarly below that would avoid else case.

Agreed, that will reduce some code.
> 
> > +               if (err < 0)
> > +                       goto error_ret;
> > +               else
> > +                       tps6507x_dev->ts->poll_period = val32;
> > +
> > +               err = of_property_read_u32(node, "ti,min_pressure", &val32);
> > +               if (err < 0)
> > +                       goto error_ret;
> > +               else
> > +                       tps6507x_dev->ts->min_pressure = val32;
> > +
> > +               err = of_property_read_u32(node, "ti,vref", &val32);
> > +               if (err < 0)
> > +                       goto error_ret;
> > +               else
> > +                       tps6507x_dev->ts->vref = val32;
> > +
> > +               err = of_property_read_u32(node, "ti,vendor", &val32);
> > +               if (err < 0)
> > +                       goto error_ret;
> > +               else
> > +                       input_dev->id.vendor = val32;
> > +
> > +               err = of_property_read_u32(node, "ti,product", &val32);
> > +               if (err < 0)
> > +                       goto error_ret;
> > +               else
> > +                       input_dev->id.product = val32;
> > +
> > +               err = of_property_read_u32(node, "ti,version", &val32);
> > +               if (err < 0)
> > +                       goto error_ret;
> > +               else
> > +                       input_dev->id.version = val32;
> > +       } else {
> > +               err = -EINVAL;
> > +               goto error_ret;
> > +       }
> you can move this check at the top when both are NULL.

Ok, I will move this check at the top.
> 
> Regards,
> --Prabhakar Lad
> 


Regards, 
Manish