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Date:   Wed, 20 Feb 2019 10:42:44 +0000
From:   "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>
To:     "jic23@...nel.org" <jic23@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "knaack.h@....de" <knaack.h@....de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/6] iio: imu: adis16480: Add support for configurable
 drdy indicator

On Mi, 2019-02-20 at 10:29 +0000, Jonathan Cameron wrote:
> [External]
> 
> 
> On Tue, 19 Feb 2019 19:12:14 +0200
> Stefan Popa <stefan.popa@...log.com> wrote:
> 
> > 
> > The FNCTIO_CTRL register provides configuration control for each I/O
> > pin
> > (DIO1, DIO2, DIO3 and DIO4).
> > 
> > This patch adds the option to configure each DIOx pin as data ready
> > indicator with positive or negative polarity by reading the
> > 'interrupts'
> > and 'interrupt-names' properties from the devicetree. The
> > 'interrupt-names' property is optional, if it is not specified, then
> > the
> > factory default DIO2 data ready signal is used.
> > 
> > Signed-off-by: Stefan Popa <stefan.popa@...log.com>
> Other than follow on from the previous patch change of the default, this
> looks fine to me.
> 
> One question inline.
> 
> Jonathan
Hi Jonathan,

Thank you for the review!
I will fall back on the 'wrong' default in the previous patch.
Answer inline.

-Stefan

> > 
> > ---
> >  drivers/iio/imu/adis16480.c | 76
> > +++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 76 insertions(+)
> > 
> > diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
> > index d222188..38ba0c1 100644
> > --- a/drivers/iio/imu/adis16480.c
> > +++ b/drivers/iio/imu/adis16480.c
> > @@ -10,6 +10,7 @@
> >   */
> > 
> >  #include <linux/bitfield.h>
> > +#include <linux/of_irq.h>
> >  #include <linux/interrupt.h>
> >  #include <linux/delay.h>
> >  #include <linux/mutex.h>
> > @@ -109,6 +110,10 @@
> >  #define
> > ADIS16480_FIR_COEF_D(x)                      ADIS16480_FIR_COEF(0x0B,
> > (x))
> > 
> >  /* ADIS16480_REG_FNCTIO_CTRL */
> > +#define ADIS16480_DRDY_SEL_MSK               GENMASK(1, 0)
> > +#define
> > ADIS16480_DRDY_SEL(x)                FIELD_PREP(ADIS16480_DRDY_SEL_MSK,
> > x)
> > +#define ADIS16480_DRDY_POL_MSK               BIT(2)
> > +#define
> > ADIS16480_DRDY_POL(x)                FIELD_PREP(ADIS16480_DRDY_POL_MSK,
> > x)
> >  #define ADIS16480_DRDY_EN_MSK                BIT(3)
> >  #define ADIS16480_DRDY_EN(x)         FIELD_PREP(ADIS16480_DRDY_EN_MSK,
> > x)
> > 
> > @@ -121,12 +126,26 @@ struct adis16480_chip_info {
> >       unsigned int accel_max_scale;
> >  };
> > 
> > +enum adis16480_int_pin {
> > +     ADIS16480_PIN_DIO1,
> > +     ADIS16480_PIN_DIO2,
> > +     ADIS16480_PIN_DIO3,
> > +     ADIS16480_PIN_DIO4
> > +};
> > +
> >  struct adis16480 {
> >       const struct adis16480_chip_info *chip_info;
> > 
> >       struct adis adis;
> >  };
> > 
> > +static const char * const adis16480_int_pin_names[4] = {
> > +     [ADIS16480_PIN_DIO1] = "DIO1",
> > +     [ADIS16480_PIN_DIO2] = "DIO2",
> > +     [ADIS16480_PIN_DIO3] = "DIO3",
> > +     [ADIS16480_PIN_DIO4] = "DIO4",
> > +};
> > +
> >  #ifdef CONFIG_DEBUG_FS
> > 
> >  static ssize_t adis16480_show_firmware_revision(struct file *file,
> > @@ -840,6 +859,59 @@ static const struct adis_data adis16480_data = {
> >       .enable_irq = adis16480_enable_irq,
> >  };
> > 
> > +static int adis16480_config_irq_pin(struct device_node *of_node,
> > +                                 struct adis16480 *st)
> > +{
> > +     struct irq_data *desc;
> > +     enum adis16480_int_pin pin;
> > +     unsigned int irq_type;
> > +     uint16_t val;
> > +     int i, irq = 0;
> > +
> > +     desc = irq_get_irq_data(st->adis.spi->irq);
> > +     if (!desc) {
> > +             dev_err(&st->adis.spi->dev, "Could not find IRQ %d\n",
> > irq);
> > +             return -EINVAL;
> > +     }
> > +
> > +     /* Disable data ready */
> > +     val = ADIS16480_DRDY_EN(0);
> Does it default to on after reset?
> That's a little unusual and nasty.  If not, why are you disabling here?
Yes, the default after reset is on. 
> > 
> > +
> > +     /*
> > +      * Get the interrupt from the devicetre by reading the
> > +      * interrupt-names property. If it is not specified, use
> > +      * the default interrupt on DIO2 pin.
> > +      */
> > +     pin = ADIS16480_PIN_DIO2;
> > +     for (i = 0; i < ARRAY_SIZE(adis16480_int_pin_names); i++) {
> > +             irq = of_irq_get_byname(of_node,
> > adis16480_int_pin_names[i]);
> > +             if (irq > 0) {
> > +                     pin = i;
> > +                     break;
> > +             }
> > +     }
> > +
> > +     val |= ADIS16480_DRDY_SEL(pin);
> > +
> > +     /*
> > +      * Get the interrupt line behaviour. The data ready polarity can
> > be
> > +      * configured as positive or negative, corresponding to
> > +      * IRQF_TRIGGER_RISING or IRQF_TRIGGER_FALLING respectively.
> > +      */
> > +     irq_type = irqd_get_trigger_type(desc);
> > +     if (irq_type == IRQF_TRIGGER_RISING) { /* Default */
> > +             val |= ADIS16480_DRDY_POL(1);
> > +     } else if (irq_type == IRQF_TRIGGER_FALLING) {
> > +             val |= ADIS16480_DRDY_POL(0);
> > +     } else {
> > +             dev_err(&st->adis.spi->dev,
> > +                     "Invalid interrupt type 0x%x specified\n",
> > irq_type);
> > +             return -EINVAL;
> > +     }
> > +     /* Write the data ready configuration to the FNCTIO_CTRL register
> > */
> > +     return adis_write_reg_16(&st->adis, ADIS16480_REG_FNCTIO_CTRL,
> > val);
> > +}
> > +
> >  static int adis16480_probe(struct spi_device *spi)
> >  {
> >       const struct spi_device_id *id = spi_get_device_id(spi);
> > @@ -867,6 +939,10 @@ static int adis16480_probe(struct spi_device *spi)
> >       if (ret)
> >               return ret;
> > 
> > +     ret =  adis16480_config_irq_pin(spi->dev.of_node, st);
> > +     if (ret)
> > +             return ret;
> > +
> >       ret = adis_setup_buffer_and_trigger(&st->adis, indio_dev, NULL);
> >       if (ret)
> >               return ret;

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