linux-kernel - Re: [PATCH 15/15] iio: sx9310: Enable vdd and svdd regulators at probe

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Date:   Tue, 28 Jul 2020 21:21:05 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Daniel Campello <campello@...omium.org>
Cc:     LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 15/15] iio: sx9310: Enable vdd and svdd regulators at probe

On Tue, Jul 28, 2020 at 6:14 PM Daniel Campello <campello@...omium.org> wrote:
>
> From: Stephen Boyd <swboyd@...omium.org>
>
> Enable the main power supply (vdd) and digital IO power supply (svdd)
> during probe so that the i2c communication and device works properly on
> boards that aggressively power gate these supplies.
>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Daniel Campello <campello@...omium.org>

Again wrong order.
After fixing,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> ---
>
>  drivers/iio/proximity/sx9310.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> index 202018b726e32f..24a2360b6314ef 100644
> --- a/drivers/iio/proximity/sx9310.c
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -18,6 +18,7 @@
>  #include <linux/module.h>
>  #include <linux/pm.h>
>  #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/slab.h>
>
>  #include <linux/iio/buffer.h>
> @@ -118,6 +119,7 @@ struct sx9310_data {
>         struct i2c_client *client;
>         struct iio_trigger *trig;
>         struct regmap *regmap;
> +       struct regulator_bulk_data supplies[2];
>         /*
>          * Last reading of the proximity status for each channel.
>          * We only send an event to user space when this changes.
> @@ -873,6 +875,13 @@ static int sx9310_set_indio_dev_name(struct device *dev,
>         return 0;
>  }
>
> +static void sx9310_regulator_disable(void *_data)
> +{
> +       struct sx9310_data *data = _data;
> +
> +       regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
> +}
> +
>  static int sx9310_probe(struct i2c_client *client)
>  {
>         int ret;
> @@ -886,6 +895,8 @@ static int sx9310_probe(struct i2c_client *client)
>
>         data = iio_priv(indio_dev);
>         data->client = client;
> +       data->supplies[0].supply = "vdd";
> +       data->supplies[1].supply = "svdd";
>         mutex_init(&data->mutex);
>         init_completion(&data->completion);
>
> @@ -893,6 +904,21 @@ static int sx9310_probe(struct i2c_client *client)
>         if (IS_ERR(data->regmap))
>                 return PTR_ERR(data->regmap);
>
> +       ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
> +                                     data->supplies);
> +       if (ret)
> +               return ret;
> +
> +       ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
> +       if (ret)
> +               return ret;
> +       /* Must wait for Tpor time after initial power up */
> +       usleep_range(1000, 1100);
> +
> +       ret = devm_add_action_or_reset(dev, sx9310_regulator_disable, data);
> +       if (ret)
> +               return ret;
> +
>         ret = regmap_read(data->regmap, SX9310_REG_WHOAMI, &data->whoami);
>         if (ret) {
>                 dev_err(dev, "error in reading WHOAMI register: %d\n", ret);
> --
> 2.28.0.rc0.142.g3c755180ce-goog
>


-- 
With Best Regards,
Andy Shevchenko