linux-kernel - Re: [PATCH 08/15] iio: sx9310: Use regmap_read_poll

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Message-ID: <159596507657.1360974.12104693281408043672@swboyd.mtv.corp.google.com>
Date:   Tue, 28 Jul 2020 12:37:56 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Daniel Campello <campello@...omium.org>,
        LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Daniel Campello <campello@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH 08/15] iio: sx9310: Use regmap_read_poll_timeout() for compensation

Quoting Daniel Campello (2020-07-28 08:12:51)
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> index 2465064971d0a7..3956fd679c6db9 100644
> --- a/drivers/iio/proximity/sx9310.c
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -810,22 +810,17 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev)
>         if (ret < 0)
>                 return ret;
>  
> -       for (i = 100; i >= 0; i--) {
> -               msleep(20);
> -               ret = regmap_read(data->regmap, SX9310_REG_STAT1, &val);
> -               if (ret < 0)
> -                       goto out;
> -               if (!(val & SX9310_COMPSTAT_MASK))
> -                       break;
> -       }
> -
> -       if (i < 0) {
> -               dev_err(&data->client->dev,
> -                       "initial compensation timed out: 0x%02x", val);
> -               ret = -ETIMEDOUT;
> +       ret = regmap_read_poll_timeout(data->regmap, SX9310_REG_STAT1, val,
> +                                      !(val & SX9310_REG_STAT1_COMPSTAT_MASK),
> +                                      20000, 2000000);
> +       if (ret) {
> +               if (ret == -ETIMEDOUT)
> +                       dev_err(&data->client->dev,
> +                               "0x02 << 3l compensation timed out: 0x%02x",

What does 0x02 << 3l mean?

> +                               val);
> +               return ret;
>         }
>