linux-kernel - Re: [PATCH v2 3/4] iio: accel: adxl345: Setup DATA

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Message-ID: <20170502121554.GD3030@Socrates-UM>
Date:   Tue, 2 May 2017 20:15:56 +0800
From:   Eva Rachel Retuya <eraretuya@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Daniel Baluta <daniel.baluta@...il.com>,
        Alison Schofield <amsfield22@...il.com>,
        Florian Vaussard <florian.vaussard@...g-vd.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] iio: accel: adxl345: Setup DATA_READY trigger

On Mon, May 01, 2017 at 02:31:00PM +0300, Andy Shevchenko wrote:
[...]
> > -int adxl345_core_probe(struct device *dev, struct regmap *regmap,
> > +int adxl345_core_probe(struct device *dev, struct regmap *regmap, int irq,
> >                        const char *name);
> 
> I think I commented this once. Instead of increasing parameters,
> please introduce a new struct (as separate preparatory patch) which
> will hold current parameters. Let's call it
> strut adxl345_chip {
>  struct device *dev;
>  struct regmap *regmap;
>  const char *name;
> };
> 
> I insisnt in this chage.

I'm not sure if what you want is more simpler, is it something like what
this driver does?

http://lxr.free-electrons.com/source/drivers/iio/gyro/mpu3050.h#L41
http://lxr.free-electrons.com/source/drivers/iio/gyro/mpu3050-i2c.c#L34

> 
> >  #include <linux/delay.h>
> > +#include <linux/interrupt.h>
> >  #include <linux/module.h>
> 
> > +#include <linux/of_irq.h>
> 
> Can we get rid of gnostic resource providers?
> 

I'm uninformed and still learning. Please let me know how to approach
this in some other way.

> > +static const struct iio_trigger_ops adxl345_trigger_ops = {
> 
> > +       .owner = THIS_MODULE,
> 
> Do we still need this kind of lines?
> 

I'm not sure either.
Jonathan, is it OK to omit this and also the one below?

> > +       .set_trigger_state = adxl345_drdy_trigger_set_state,
> > +};
> 
> >  static const struct iio_info adxl345_info = {
> 
> >         .driver_module  = THIS_MODULE,
> 
> Ditto, though it's in the current code.
> 
> >         .read_raw       = adxl345_read_raw,
> >  };
> 
> > +       /*
> > +        * Any bits set to 0 send their respective interrupts to the INT1 pin,
> > +        * whereas bits set to 1 send their respective interrupts to the INT2
> > +        * pin. Map all interrupts to the specified pin.
> > +        */
> > +       of_irq = of_irq_get_byname(dev->of_node, "INT2");
> 
> So, can we get it in resourse provider agnostic way?
> 
> > +       if (of_irq == irq)
> > +               regval = 0xFF;
> > +       else
> > +               regval = 0x00;
> 
> regval = of_irq == irq ? 0xff : 0x00; ?
> 

OK.

Thanks,
Eva

> > +
> > +       ret = regmap_write(data->regmap, ADXL345_REG_INT_MAP, regval);
> > +       if (ret < 0) {
> > +               dev_err(dev, "Failed to set up interrupts: %d\n", ret);
> > +               return ret;
> > +       }
> 
> -- 
> With Best Regards,
> Andy Shevchenko