On Thu, 7 Nov 2024 14:18:40 -0500 Frank Li <Frank.Li@xxxxxxx> wrote: > Use devm_* and dev_err_probe() simplify probe function and remove > vf610_adc_remove(). Change type of 'vref_uv' to int because > regulator_get_voltage() return type is int. > > Reviewed-by: Haibo Chen <haibo.chen@xxxxxxx> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx> One comment inline. > --- > Change from v2 to v3 > - change vref_uv to int from u32 to fix below warning That's not the nicest way to fix the issue. See below. > | Reported-by: kernel test robot <lkp@xxxxxxxxx> > | Closes: https://lore.kernel.org/oe-kbuild-all/202411070633.NIrO7Ert-lkp@xxxxxxxxx/ > smatch warnings: > drivers/iio/adc/vf610_adc.c:857 vf610_adc_probe() warn: unsigned 'info->vref_uv' is never less than zero. > > vim +857 drivers/iio/adc/vf610_adc.c > > Change from v1 to v2 > - add Haibo's review tag > --- > drivers/iio/adc/vf610_adc.c | 79 ++++++++++--------------------------- > 1 file changed, 20 insertions(+), 59 deletions(-) > > diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c > index 4d83c12975c53..a6a0ada8a102f 100644 > --- a/drivers/iio/adc/vf610_adc.c > +++ b/drivers/iio/adc/vf610_adc.c > @@ -160,7 +160,7 @@ struct vf610_adc { > /* lock to protect against multiple access to the device */ > struct mutex lock; > > - u32 vref_uv; > + int vref_uv; > u32 value; > struct regulator *vref; > > @@ -823,10 +823,8 @@ static int vf610_adc_probe(struct platform_device *pdev) > int ret; > > indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct vf610_adc)); > - if (!indio_dev) { > - dev_err(&pdev->dev, "Failed allocating iio device\n"); > - return -ENOMEM; > - } > + if (!indio_dev) > + return dev_err_probe(&pdev->dev, -ENOMEM, "Failed allocating iio device\n"); > > info = iio_priv(indio_dev); > info->dev = &pdev->dev; > @@ -842,27 +840,22 @@ static int vf610_adc_probe(struct platform_device *pdev) > ret = devm_request_irq(info->dev, irq, > vf610_adc_isr, 0, > dev_name(&pdev->dev), indio_dev); > - if (ret < 0) { > - dev_err(&pdev->dev, "failed requesting irq, irq = %d\n", irq); > - return ret; > - } > + if (ret < 0) > + dev_err_probe(&pdev->dev, ret, "failed requesting irq, irq = %d\n", irq); > > - info->clk = devm_clk_get(&pdev->dev, "adc"); > - if (IS_ERR(info->clk)) { > - dev_err(&pdev->dev, "failed getting clock, err = %ld\n", > - PTR_ERR(info->clk)); > - return PTR_ERR(info->clk); > - } > + info->clk = devm_clk_get_enabled(&pdev->dev, "adc"); > + if (IS_ERR(info->clk)) > + return dev_err_probe(&pdev->dev, PTR_ERR(info->clk), > + "failed getting clock, err = %ld\n", > + PTR_ERR(info->clk)); > > info->vref = devm_regulator_get(&pdev->dev, "vref"); > if (IS_ERR(info->vref)) > return PTR_ERR(info->vref); > > - ret = regulator_enable(info->vref); > - if (ret) > - return ret; > - > - info->vref_uv = regulator_get_voltage(info->vref); > + info->vref_uv = devm_regulator_get_enable_read_voltage(&pdev->dev, "vref"); > + if (info->vref_uv < 0) > + return info->vref_uv; whilst I've suggested not doing this in this fashion anyway so this code will probably go away but in general prefer this sort of handling done as ret = devm_regulator_get_enable_read_voltage(); if (ret < 0) return ret; info->vref_uv = ret; so that we don't bounce a potential error code through a state variable and have to change the type as you have done here. > > device_property_read_u32_array(dev, "fsl,adck-max-frequency", info->max_adck_rate, 3); > > @@ -879,52 +872,21 @@ static int vf610_adc_probe(struct platform_device *pdev) > indio_dev->channels = vf610_adc_iio_channels; > indio_dev->num_channels = ARRAY_SIZE(vf610_adc_iio_channels); > > - ret = clk_prepare_enable(info->clk); > - if (ret) { > - dev_err(&pdev->dev, > - "Could not prepare or enable the clock.\n"); > - goto error_adc_clk_enable; > - } > - > vf610_adc_cfg_init(info); > vf610_adc_hw_init(info); > > - ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, > - NULL, &iio_triggered_buffer_setup_ops); > - if (ret < 0) { > - dev_err(&pdev->dev, "Couldn't initialise the buffer\n"); > - goto error_iio_device_register; > - } > + ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev, &iio_pollfunc_store_time, > + NULL, &iio_triggered_buffer_setup_ops); > + if (ret < 0) > + return dev_err_probe(&pdev->dev, ret, "Couldn't initialise the buffer\n"); > > mutex_init(&info->lock); > > - ret = iio_device_register(indio_dev); > - if (ret) { > - dev_err(&pdev->dev, "Couldn't register the device.\n"); > - goto error_adc_buffer_init; > - } > + ret = devm_iio_device_register(&pdev->dev, indio_dev); > + if (ret) > + return dev_err_probe(&pdev->dev, ret, "Couldn't register the device.\n"); > > return 0; > - > -error_adc_buffer_init: > - iio_triggered_buffer_cleanup(indio_dev); > -error_iio_device_register: > - clk_disable_unprepare(info->clk); > -error_adc_clk_enable: > - regulator_disable(info->vref); > - > - return ret; > -} > - > -static void vf610_adc_remove(struct platform_device *pdev) > -{ > - struct iio_dev *indio_dev = platform_get_drvdata(pdev); > - struct vf610_adc *info = iio_priv(indio_dev); > - > - iio_device_unregister(indio_dev); > - iio_triggered_buffer_cleanup(indio_dev); > - regulator_disable(info->vref); > - clk_disable_unprepare(info->clk); > } > > static int vf610_adc_suspend(struct device *dev) > @@ -972,7 +934,6 @@ static DEFINE_SIMPLE_DEV_PM_OPS(vf610_adc_pm_ops, vf610_adc_suspend, > > static struct platform_driver vf610_adc_driver = { > .probe = vf610_adc_probe, > - .remove = vf610_adc_remove, > .driver = { > .name = DRIVER_NAME, > .of_match_table = vf610_adc_match,
