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Date: Tue, 2 Jun 2020 07:56:49 +0000
From: Jean-Baptiste Maneyrol <JManeyrol@...ensense.com>
To: Jonathan Cameron <jic23@...nel.org>
CC: "robh+dt@...nel.org" <robh+dt@...nel.org>,
"robh@...nel.org" <robh@...nel.org>,
"mchehab+huawei@...nel.org" <mchehab+huawei@...nel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/12] iio: imu: inv_icm42600: add core of new
inv_icm42600 driver
Hi Jonathan,
I've given my review tag for the const change of iio_device_get_drvdata(). Would be perfect to have this cleaned up for the v3.
For vddio regulator you are missing something. In all suspend callbacks (system and runtime) I am calling directly regulator_disable to shut vddio off at then end. And in all resume callbacks I am calling inv_icm42600_enable_regulator_vddio() that is turning vddio regulator back on and is sleeping to wait a little for the supply ramp.
Indeed this doesn't look symmetric, but I was not very happy to add a inv_icm42600_disable_regulator_vddio() that would just do regulator_disable, or copy/paste the sleeping value in all resume handlers.
Tell me what you prefer.
Thanks,
JB
From: linux-iio-owner@...r.kernel.org <linux-iio-owner@...r.kernel.org> on behalf of Jonathan Cameron <jic23@...nel.org>
Sent: Sunday, May 31, 2020 13:34
To: Jean-Baptiste Maneyrol <JManeyrol@...ensense.com>
Cc: robh+dt@...nel.org <robh+dt@...nel.org>; robh@...nel.org <robh@...nel.org>; mchehab+huawei@...nel.org <mchehab+huawei@...nel.org>; davem@...emloft.net <davem@...emloft.net>; gregkh@...uxfoundation.org <gregkh@...uxfoundation.org>; linux-iio@...r.kernel.org <linux-iio@...r.kernel.org>; devicetree@...r.kernel.org <devicetree@...r.kernel.org>; linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/12] iio: imu: inv_icm42600: add core of new inv_icm42600 driver
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On Wed, 27 May 2020 20:57:00 +0200
Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com> wrote:
> Core component of a new driver for InvenSense ICM-426xx devices.
> It includes registers definition, main probe/setup, and device
> utility functions.
>
> ICM-426xx devices are latest generation of 6-axis IMU,
> gyroscope+accelerometer and temperature sensor. This device
> includes a 2K FIFO, supports I2C/I3C/SPI, and provides
> intelligent motion features like pedometer, tilt detection,
> and tap detection.
>
> Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>
A few things inline.
Either I'm missing something or I'm guessing vddio is not controllable
on your test board.
> ---
> drivers/iio/imu/inv_icm42600/inv_icm42600.h | 372 ++++++++++
> .../iio/imu/inv_icm42600/inv_icm42600_core.c | 635 ++++++++++++++++++
> 2 files changed, 1007 insertions(+)
> create mode 100644 drivers/iio/imu/inv_icm42600/inv_icm42600.h
> create mode 100644 drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
>
...
> diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
> new file mode 100644
> index 000000000000..81b171d6782c
> --- /dev/null
> +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
> +const struct iio_mount_matrix *
> +inv_icm42600_get_mount_matrix(const struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan)
> +{
> + const struct inv_icm42600_state *st =
> + iio_device_get_drvdata((struct iio_dev *)indio_dev);
If you review my patch to the core, I can get that applied and we can drop
the ugly cast from here!
Just waiting for someone to sanity check it.
> +
> + return &st->orientation;
> +}
...
> +/* Runtime suspend will turn off sensors that are enabled by iio devices. */
> +static int __maybe_unused inv_icm42600_runtime_suspend(struct device *dev)
> +{
> + struct inv_icm42600_state *st = dev_get_drvdata(dev);
> + int ret;
> +
> + mutex_lock(&st->lock);
> +
> + /* disable all sensors */
> + ret = inv_icm42600_set_pwr_mgmt0(st, INV_ICM42600_SENSOR_MODE_OFF,
> + INV_ICM42600_SENSOR_MODE_OFF, false,
> + NULL);
> + if (ret)
> + goto error_unlock;
> +
> + regulator_disable(st->vddio_supply);
Don't seem to turn this on again in runtime_resume..
Why? Definitely needs at least a comment.
> +
> +error_unlock:
> + mutex_unlock(&st->lock);
> + return ret;
> +}
> +
> +/* Sensors are enabled by iio devices, no need to turn them back on here. */
> +static int __maybe_unused inv_icm42600_runtime_resume(struct device *dev)
> +{
> + struct inv_icm42600_state *st = dev_get_drvdata(dev);
> + int ret;
> +
> + mutex_lock(&st->lock);
> +
> + ret = inv_icm42600_enable_regulator_vddio(st);
> +
> + mutex_unlock(&st->lock);
> + return ret;
> +}
> +
> +const struct dev_pm_ops inv_icm42600_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(inv_icm42600_suspend, inv_icm42600_resume)
> + SET_RUNTIME_PM_OPS(inv_icm42600_runtime_suspend,
> + inv_icm42600_runtime_resume, NULL)
> +};
> +EXPORT_SYMBOL_GPL(inv_icm42600_pm_ops);
> +
> +MODULE_AUTHOR("InvenSense, Inc.");
> +MODULE_DESCRIPTION("InvenSense ICM-426xx device driver");
> +MODULE_LICENSE("GPL");
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