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Date: Sun, 10 Nov 2019 15:31:14 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Stephan Gerhold <stephan@...hold.net>
Cc: Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Linus Walleij <linus.walleij@...aro.org>,
Brian Masney <masneyb@...tation.org>,
Jonathan Marek <jonathan@...ek.ca>,
Jean-Baptiste Maneyrol <JManeyrol@...ensense.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] iio: imu: mpu6050: Add support for vdd-supply
regulator
On Thu, 7 Nov 2019 19:43:42 +0100
Stephan Gerhold <stephan@...hold.net> wrote:
> MPU6050 has two power supply pins: VDD and VLOGIC, but the
> mpu6050 driver only supports enabling one of them at the moment.
> In some cases, they may need to be enabled separately.
>
> Add an additional "vdd-supply" that stays enabled for as long as
> the driver is loaded. We cannot turn off the VDD regulator during
> suspend as this would cause register settings (FSR, sampling rate, ...)
> to be lost.
>
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
Looks good to me.
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to poke it.
Thanks
Jonathan
> ---
> Changes in v2:
> - Keep "vdd-supply" enabled during suspend to prevent register
> settings from getting lost.
> - Revert convertion to bulk regulator API (does not work well
> when regulators need to be enabled/disabled separately)
>
> v1: https://lore.kernel.org/linux-iio/20191106183536.123070-2-stephan@gerhold.net/
> ---
> drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 43 +++++++++++++++++-----
> drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 4 +-
> 2 files changed, 37 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> index 354030e9bed5..661a829478f5 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> @@ -1140,14 +1140,14 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
> return result;
> }
>
> -static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st)
> +static int inv_mpu_core_enable_regulator_vddio(struct inv_mpu6050_state *st)
> {
> int result;
>
> result = regulator_enable(st->vddio_supply);
> if (result) {
> dev_err(regmap_get_device(st->map),
> - "Failed to enable regulator: %d\n", result);
> + "Failed to enable vddio regulator: %d\n", result);
> } else {
> /* Give the device a little bit of time to start up. */
> usleep_range(35000, 70000);
> @@ -1156,21 +1156,29 @@ static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st)
> return result;
> }
>
> -static int inv_mpu_core_disable_regulator(struct inv_mpu6050_state *st)
> +static int inv_mpu_core_disable_regulator_vddio(struct inv_mpu6050_state *st)
> {
> int result;
>
> result = regulator_disable(st->vddio_supply);
> if (result)
> dev_err(regmap_get_device(st->map),
> - "Failed to disable regulator: %d\n", result);
> + "Failed to disable vddio regulator: %d\n", result);
>
> return result;
> }
>
> static void inv_mpu_core_disable_regulator_action(void *_data)
> {
> - inv_mpu_core_disable_regulator(_data);
> + struct inv_mpu6050_state *st = _data;
> + int result;
> +
> + result = regulator_disable(st->vdd_supply);
> + if (result)
> + dev_err(regmap_get_device(st->map),
> + "Failed to disable vdd regulator: %d\n", result);
> +
> + inv_mpu_core_disable_regulator_vddio(st);
> }
>
> int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
> @@ -1239,6 +1247,15 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
> return -EINVAL;
> }
>
> + st->vdd_supply = devm_regulator_get(dev, "vdd");
> + if (IS_ERR(st->vdd_supply)) {
> + if (PTR_ERR(st->vdd_supply) != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get vdd regulator %d\n",
> + (int)PTR_ERR(st->vdd_supply));
> +
> + return PTR_ERR(st->vdd_supply);
> + }
> +
> st->vddio_supply = devm_regulator_get(dev, "vddio");
> if (IS_ERR(st->vddio_supply)) {
> if (PTR_ERR(st->vddio_supply) != -EPROBE_DEFER)
> @@ -1248,9 +1265,17 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
> return PTR_ERR(st->vddio_supply);
> }
>
> - result = inv_mpu_core_enable_regulator(st);
> - if (result)
> + result = regulator_enable(st->vdd_supply);
> + if (result) {
> + dev_err(dev, "Failed to enable vdd regulator: %d\n", result);
> return result;
> + }
> +
> + result = inv_mpu_core_enable_regulator_vddio(st);
> + if (result) {
> + regulator_disable(st->vdd_supply);
> + return result;
> + }
>
> result = devm_add_action_or_reset(dev, inv_mpu_core_disable_regulator_action,
> st);
> @@ -1352,7 +1377,7 @@ static int inv_mpu_resume(struct device *dev)
> int result;
>
> mutex_lock(&st->lock);
> - result = inv_mpu_core_enable_regulator(st);
> + result = inv_mpu_core_enable_regulator_vddio(st);
> if (result)
> goto out_unlock;
>
> @@ -1370,7 +1395,7 @@ static int inv_mpu_suspend(struct device *dev)
>
> mutex_lock(&st->lock);
> result = inv_mpu6050_set_power_itg(st, false);
> - inv_mpu_core_disable_regulator(st);
> + inv_mpu_core_disable_regulator_vddio(st);
> mutex_unlock(&st->lock);
>
> return result;
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> index 52fcf45050a5..4fcf683b9c63 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> @@ -130,7 +130,8 @@ struct inv_mpu6050_hw {
> * @chip_period: chip internal period estimation (~1kHz).
> * @it_timestamp: timestamp from previous interrupt.
> * @data_timestamp: timestamp for next data sample.
> - * @vddio_supply voltage regulator for the chip.
> + * @vdd_supply: VDD voltage regulator for the chip.
> + * @vddio_supply I/O voltage regulator for the chip.
> * @magn_disabled: magnetometer disabled for backward compatibility reason.
> * @magn_raw_to_gauss: coefficient to convert mag raw value to Gauss.
> * @magn_orient: magnetometer sensor chip orientation if available.
> @@ -154,6 +155,7 @@ struct inv_mpu6050_state {
> s64 chip_period;
> s64 it_timestamp;
> s64 data_timestamp;
> + struct regulator *vdd_supply;
> struct regulator *vddio_supply;
> bool magn_disabled;
> s32 magn_raw_to_gauss[3];
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