Hi, Jonathan Best Regards! Anson Huang > -----Original Message----- > From: Jonathan Cameron [mailto:jic23@xxxxxxxxxx] > Sent: 2018年12月23日 1:20 > To: Anson Huang <anson.huang@xxxxxxx> > Cc: knaack.h@xxxxxx; lars@xxxxxxxxxx; pmeerw@xxxxxxxxxx; > robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; martink@xxxxxxxxx; > gregkh@xxxxxxxxxxxxxxxxxxx; gustavo@xxxxxxxxxxxxxx; Leonard Crestez > <leonard.crestez@xxxxxxx>; rtresidd@xxxxxxxxxxxxxxxxx; > linux-iio@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; > linux-kernel@xxxxxxxxxxxxxxx; festevam@xxxxxxxxx; > preid@xxxxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx> > Subject: Re: [PATCH V5 2/2] iio: accell: mma8452: add vdd/vddio regulator > operation support > > On Mon, 17 Dec 2018 05:22:55 +0000 > Anson Huang <anson.huang@xxxxxxx> wrote: > > > The accelerometer's power supply could be controllable on some > > platforms, such as i.MX6Q-SABRESD board, the mma8451's power supplies > > are controlled by a GPIO fixed regulator, need to make sure the > > regulators are enabled before any communication with mma8451, this > > patch adds vdd/vddio regulator operation support. > > > > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx> > > Acked-by: Martin Kepplinger <martink@xxxxxxxxx> > > There is a lot of manual handling in the suspend and resume I would not > expect to see. That should be using the runtime pm calls to take control of > pm rather than making assumptions about what runtime pm state we are in... Yes, but I found we can just use pm_runtime_force_suspend/resume for suspend/resume operations, since the operations are same, it will simply the code and I tested it, it works. Anson. > > Jonathan > > > --- > > ChangeLog since V4: > > - using devm_regulator_get() instead of devm_regulator_get_optional() > since the regulator is > > there always, if dtb does NOT specify one, regulator framework will > assign dummy regulator for it. > > --- > > drivers/iio/accel/mma8452.c | 183 > > +++++++++++++++++++++++++++++++++++++++++--- > > 1 file changed, 172 insertions(+), 11 deletions(-) > > > > diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c > > index 421a0a8..9a52426 100644 > > --- a/drivers/iio/accel/mma8452.c > > +++ b/drivers/iio/accel/mma8452.c > > @@ -31,6 +31,7 @@ > > #include <linux/of_device.h> > > #include <linux/of_irq.h> > > #include <linux/pm_runtime.h> > > +#include <linux/regulator/consumer.h> > > > > #define MMA8452_STATUS 0x00 > > #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) > > @@ -107,6 +108,8 @@ struct mma8452_data { > > u8 data_cfg; > > const struct mma_chip_info *chip_info; > > int sleep_val; > > + struct regulator *vdd_reg; > > + struct regulator *vddio_reg; > > }; > > > > /** > > @@ -1534,9 +1537,37 @@ static int mma8452_probe(struct i2c_client > *client, > > mutex_init(&data->lock); > > data->chip_info = match->data; > > > > + data->vdd_reg = devm_regulator_get(&client->dev, "vdd"); > > + if (IS_ERR(data->vdd_reg)) { > > + ret = PTR_ERR(data->vdd_reg); > > + if (ret != -EPROBE_DEFER) > > + dev_err(&client->dev, "failed to get VDD regulator!\n"); > > + return ret; > > + } > > + > > + ret = regulator_enable(data->vdd_reg); > > + if (ret) { > > + dev_err(&client->dev, "failed to enable VDD regulator!\n"); > > + return ret; > > + } > > Please reorder so the unwind order in remove and devm cleanup is the > opposite of setup order. I suspect that is just a case of doing the two gets > before enabling either regulator, but I haven't checked. > > > + > > + data->vddio_reg = devm_regulator_get(&client->dev, "vddio"); > > + if (IS_ERR(data->vddio_reg)) { > > + ret = PTR_ERR(data->vddio_reg); > > + if (ret != -EPROBE_DEFER) > > + dev_err(&client->dev, "failed to get VDDIO regulator!\n"); > > + goto disable_regulator_vdd; > > + } > > + > > + ret = regulator_enable(data->vddio_reg); > > + if (ret) { > > + dev_err(&client->dev, "failed to enable VDDIO regulator!\n"); > > + goto disable_regulator_vdd; > > + } > > + > > ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > > > switch (ret) { > > case MMA8451_DEVICE_ID: > > @@ -1549,7 +1580,8 @@ static int mma8452_probe(struct i2c_client > *client, > > break; > > /* else: fall through */ > > default: > > - return -ENODEV; > > + ret = -ENODEV; > > + goto disable_regulators; > > } > > > > dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n", @@ > > -1566,13 +1598,13 @@ static int mma8452_probe(struct i2c_client > > *client, > > > > ret = mma8452_reset(client); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > > > data->data_cfg = MMA8452_DATA_CFG_FS_2G; > > ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG, > > data->data_cfg); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > > > /* > > * By default set transient threshold to max to avoid events if @@ > > -1581,7 +1613,7 @@ static int mma8452_probe(struct i2c_client *client, > > ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS, > > MMA8452_TRANSIENT_THS_MASK); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > > > if (client->irq) { > > int irq2; > > @@ -1595,7 +1627,7 @@ static int mma8452_probe(struct i2c_client > *client, > > MMA8452_CTRL_REG5, > > data->chip_info->all_events); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > > > dev_dbg(&client->dev, "using interrupt line INT1\n"); > > } > > @@ -1604,11 +1636,11 @@ static int mma8452_probe(struct i2c_client > *client, > > MMA8452_CTRL_REG4, > > data->chip_info->enabled_events); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > > > ret = mma8452_trigger_setup(indio_dev); > > if (ret < 0) > > - return ret; > > + goto disable_regulators; > > } > > > > data->ctrl_reg1 = MMA8452_CTRL_ACTIVE | @@ -1661,12 +1693,20 > @@ > > static int mma8452_probe(struct i2c_client *client, > > trigger_cleanup: > > mma8452_trigger_cleanup(indio_dev); > > > > +disable_regulators: > > + regulator_disable(data->vddio_reg); > > + > > +disable_regulator_vdd: > > + regulator_disable(data->vdd_reg); > > + > > return ret; > > } > > > > static int mma8452_remove(struct i2c_client *client) { > > struct iio_dev *indio_dev = i2c_get_clientdata(client); > > + struct mma8452_data *data = iio_priv(indio_dev); > > + int ret; > > > > iio_device_unregister(indio_dev); > > > > @@ -1678,6 +1718,18 @@ static int mma8452_remove(struct i2c_client > *client) > > mma8452_trigger_cleanup(indio_dev); > > mma8452_standby(iio_priv(indio_dev)); > > > > + ret = regulator_disable(data->vddio_reg); > > + if (ret) { > > + dev_err(&client->dev, "failed to disable VDDIO regulator\n"); > > + return ret; > > + } > > + > > + ret = regulator_disable(data->vdd_reg); > > + if (ret) { > > + dev_err(&client->dev, "failed to disable VDD regulator\n"); > > + return ret; > > + } > > + > > return 0; > > } > > > > @@ -1696,6 +1748,18 @@ static int mma8452_runtime_suspend(struct > device *dev) > > return -EAGAIN; > > } > > > > + ret = regulator_disable(data->vddio_reg); > > + if (ret) { > > + dev_err(dev, "failed to disable VDDIO regulator\n"); > > + return ret; > > + } > > + > > + ret = regulator_disable(data->vdd_reg); > > + if (ret) { > > + dev_err(dev, "failed to disable VDD regulator\n"); > > + return ret; > > + } > > + > > return 0; > > } > > > > @@ -1705,9 +1769,22 @@ static int mma8452_runtime_resume(struct > device *dev) > > struct mma8452_data *data = iio_priv(indio_dev); > > int ret, sleep_val; > > > > + ret = regulator_enable(data->vdd_reg); > > + if (ret) { > > + dev_err(dev, "failed to enable VDD regulator\n"); > > + return ret; > > + } > > + > > + ret = regulator_enable(data->vddio_reg); > > + if (ret) { > > + dev_err(dev, "failed to enable VDDIO regulator\n"); > > + regulator_disable(data->vdd_reg); > > + return ret; > > + } > > + > > ret = mma8452_active(data); > > if (ret < 0) > > - return ret; > > + goto runtime_resume_failed; > > > > ret = mma8452_get_odr_index(data); > > sleep_val = 1000 / mma8452_samp_freq[ret][0]; @@ -1717,20 > +1794,104 > > @@ static int mma8452_runtime_resume(struct device *dev) > > msleep_interruptible(sleep_val); > > > > return 0; > > + > > +runtime_resume_failed: > > + regulator_disable(data->vddio_reg); > > + regulator_disable(data->vdd_reg); > > + > > + return ret; > > } > > #endif > > > > #ifdef CONFIG_PM_SLEEP > > static int mma8452_suspend(struct device *dev) { > > - return mma8452_standby(iio_priv(i2c_get_clientdata( > > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > > + struct mma8452_data *data = iio_priv(indio_dev); > > + int ret; > > + > > I'd rather see the runtime pm calls done than doing this directly. > So you should let the runtime pm know it needs to power the device on, then > take over control (disable runtime pm) and power down. > > > + ret = regulator_enable(data->vdd_reg); > > + if (ret) { > > + dev_err(dev, "failed to enable VDD regulator\n"); > > + return ret; > > + } > > + > > + ret = regulator_enable(data->vddio_reg); > > + if (ret) { > > + dev_err(dev, "failed to enable VDDIO regulator\n"); > > + regulator_disable(data->vdd_reg); > > + return ret; > > + } > > + > > + ret = mma8452_standby(iio_priv(i2c_get_clientdata( > > to_i2c_client(dev)))); > > + if (ret) > > + goto suspend_failed; > > + > > + ret = regulator_disable(data->vddio_reg); > > + if (ret) { > > + dev_err(dev, "failed to disable VDDIO regulator\n"); > > + return ret; > > + } > > + > > + ret = regulator_disable(data->vdd_reg); > > + if (ret) { > > + dev_err(dev, "failed to disable VDD regulator\n"); > > + return ret; > > + } > > + > > + return 0; > > + > > +suspend_failed: > > + regulator_disable(data->vddio_reg); > > + regulator_disable(data->vdd_reg); > > + > > + return ret; > > } > > > > static int mma8452_resume(struct device *dev) { > > - return mma8452_active(iio_priv(i2c_get_clientdata( > > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > > + struct mma8452_data *data = iio_priv(indio_dev); > > + int ret; > > + > > + ret = regulator_enable(data->vdd_reg); > > + if (ret) { > > + dev_err(dev, "failed to enable VDD regulator\n"); > > + return ret; > > + } > > + > > + ret = regulator_enable(data->vddio_reg); > > + if (ret) { > > + dev_err(dev, "failed to enable VDDIO regulator\n"); > > + regulator_disable(data->vdd_reg); > > + return ret; > > + } > > + > > + ret = mma8452_active(iio_priv(i2c_get_clientdata( > > to_i2c_client(dev)))); > > + if (ret) > > + goto resume_failed; > > + > > + ret = regulator_disable(data->vddio_reg); > > + if (ret) { > > + dev_err(dev, "failed to disable VDDIO regulator\n"); > > + return ret; > > This is odd in a resume path to turn it off. Normally you just hand off to the > runtime pm again to autosuspend as necessary. > > > + } > > + > > + ret = regulator_disable(data->vdd_reg); > > + if (ret) { > > + dev_err(dev, "failed to disable VDD regulator\n"); > > + return ret; > > + } > > + > > + return 0; > > + > > +resume_failed: > > + regulator_disable(data->vddio_reg); > > + regulator_disable(data->vdd_reg); > > + > > + return ret; > > } > > #endif > >
