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Message-ID: <20240328135808.7aff4fb5@jic23-huawei>
Date: Thu, 28 Mar 2024 13:58:08 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Jonathan Corbet <corbet@....net>, Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, Jean Delvare <jdelvare@...e.com>, Guenter
Roeck <linux@...ck-us.net>, Support Opensource
<support.opensource@...semi.com>, Cosmin Tanislav
<cosmin.tanislav@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, Michael
Hennerich <Michael.Hennerich@...log.com>, Antoniu Miclaus
<antoniu.miclaus@...log.com>, Greg Kroah-Hartman
<gregkh@...uxfoundation.org>, Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-iio@...r.kernel.org,
linux-staging@...ts.linux.dev, linux-input@...r.kernel.org
Subject: Re: [PATCH RFC 4/7] iio: addac: ad74115: Use
devm_regulator_get_enable_get_voltage()
On Wed, 27 Mar 2024 18:18:53 -0500
David Lechner <dlechner@...libre.com> wrote:
> We can reduce boilerplate code by using
> devm_regulator_get_enable_get_voltage().
There is a change in behaviour in this one. I'd like some
explanation in the patch title for why it is always safe to get
the voltage of avdd_mv when previously it wasn't.
There seems to me to be a corner case where a DTS is not providing
the entry because it's always powered on so we get a stub regulator
but that doesn't matter because we aren't in DIN_THRESHOLD_MOD_AVDD.
After this change that dts is broken as now we read the voltage
whatever.
You could use the optional form and then fail the probe if
in a mode where the value will be used?
>
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---
> drivers/iio/addac/ad74115.c | 28 +++-------------------------
> 1 file changed, 3 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/iio/addac/ad74115.c b/drivers/iio/addac/ad74115.c
> index e6bc5eb3788d..01073d7de6aa 100644
> --- a/drivers/iio/addac/ad74115.c
> +++ b/drivers/iio/addac/ad74115.c
> @@ -199,7 +199,6 @@ struct ad74115_state {
> struct spi_device *spi;
> struct regmap *regmap;
> struct iio_trigger *trig;
> - struct regulator *avdd;
>
> /*
> * Synchronize consecutive operations when doing a one-shot
> @@ -1672,14 +1671,6 @@ static int ad74115_setup(struct iio_dev *indio_dev)
> if (ret)
> return ret;
>
> - if (val == AD74115_DIN_THRESHOLD_MODE_AVDD) {
> - ret = regulator_get_voltage(st->avdd);
> - if (ret < 0)
> - return ret;
> -
> - st->avdd_mv = ret / 1000;
> - }
> -
> st->din_threshold_mode = val;
>
> ret = ad74115_apply_fw_prop(st, &ad74115_dac_bipolar_fw_prop, &val);
> @@ -1788,11 +1779,6 @@ static int ad74115_reset(struct ad74115_state *st)
> return 0;
> }
>
> -static void ad74115_regulator_disable(void *data)
> -{
> - regulator_disable(data);
> -}
> -
> static int ad74115_setup_trigger(struct iio_dev *indio_dev)
> {
> struct ad74115_state *st = iio_priv(indio_dev);
> @@ -1855,19 +1841,11 @@ static int ad74115_probe(struct spi_device *spi)
> indio_dev->modes = INDIO_DIRECT_MODE;
> indio_dev->info = &ad74115_info;
>
> - st->avdd = devm_regulator_get(dev, "avdd");
> - if (IS_ERR(st->avdd))
> - return PTR_ERR(st->avdd);
> -
> - ret = regulator_enable(st->avdd);
> - if (ret) {
> - dev_err(dev, "Failed to enable avdd regulator\n");
> + ret = devm_regulator_get_enable_get_voltage(dev, "avdd");
> + if (ret < 0)
> return ret;
> - }
>
> - ret = devm_add_action_or_reset(dev, ad74115_regulator_disable, st->avdd);
> - if (ret)
> - return ret;
> + st->avdd_mv = ret / 1000;
>
> ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulator_names),
> regulator_names);
>
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