On Fri, 10 Jun 2022 10:45:43 +0200 Nuno Sá <nuno.sa@xxxxxxxxxx> wrote: > Make the conversion to firmware agnostic device properties. As part of > the conversion the IIO inkern interface 'of_xlate()' is also converted to > 'fwnode_xlate()'. The goal is to completely drop 'of_xlate' and hence OF > dependencies from IIO. > > Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx> One trivial comment inline. In general this particular refactor is complex, so I either want eyes of those familiar with the driver and / or testing or we may want to reduce the scope to just the fwnode_xlate() and leave the more complex conversions for when we can get that testing done. Let's see if we get the necessary review on this more complex patch. I just don't want us to get stalled by trying to do too much at once! Jonathan > --- > drivers/iio/adc/stm32-adc.c | 128 ++++++++++++++++++++---------------- > 1 file changed, 70 insertions(+), 58 deletions(-) > > diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c > index a68ecbda6480..87acef31ace1 100644 > --- a/drivers/iio/adc/stm32-adc.c > +++ b/drivers/iio/adc/stm32-adc.c > @@ -21,11 +21,11 @@ > #include <linux/io.h> > #include <linux/iopoll.h> > #include <linux/module.h> > +#include <linux/mod_devicetable.h> > #include <linux/nvmem-consumer.h> > #include <linux/platform_device.h> > #include <linux/pm_runtime.h> > -#include <linux/of.h> > -#include <linux/of_device.h> > +#include <linux/property.h> > > #include "stm32-adc-core.h" > > @@ -1524,8 +1524,8 @@ static int stm32_adc_update_scan_mode(struct iio_dev *indio_dev, > return ret; > } > > -static int stm32_adc_of_xlate(struct iio_dev *indio_dev, > - const struct of_phandle_args *iiospec) > +static int stm32_adc_fwnode_xlate(struct iio_dev *indio_dev, > + const struct fwnode_reference_args *iiospec) > { > int i; > > @@ -1579,7 +1579,7 @@ static const struct iio_info stm32_adc_iio_info = { > .hwfifo_set_watermark = stm32_adc_set_watermark, > .update_scan_mode = stm32_adc_update_scan_mode, > .debugfs_reg_access = stm32_adc_debugfs_reg_access, > - .of_xlate = stm32_adc_of_xlate, > + .fwnode_xlate = stm32_adc_fwnode_xlate, > }; > > static unsigned int stm32_adc_dma_residue(struct stm32_adc *adc) > @@ -1776,14 +1776,14 @@ static const struct iio_chan_spec_ext_info stm32_adc_ext_info[] = { > {}, > }; > > -static int stm32_adc_of_get_resolution(struct iio_dev *indio_dev) > +static int stm32_adc_fw_get_resolution(struct iio_dev *indio_dev) > { > - struct device_node *node = indio_dev->dev.of_node; > + struct device *dev = &indio_dev->dev; > struct stm32_adc *adc = iio_priv(indio_dev); > unsigned int i; > u32 res; > > - if (of_property_read_u32(node, "assigned-resolution-bits", &res)) > + if (device_property_read_u32(dev, "assigned-resolution-bits", &res)) > res = adc->cfg->adc_info->resolutions[0]; > > for (i = 0; i < adc->cfg->adc_info->num_res; i++) > @@ -1867,11 +1867,11 @@ static void stm32_adc_chan_init_one(struct iio_dev *indio_dev, > > static int stm32_adc_get_legacy_chan_count(struct iio_dev *indio_dev, struct stm32_adc *adc) > { > - struct device_node *node = indio_dev->dev.of_node; > + struct device *dev = &indio_dev->dev; > const struct stm32_adc_info *adc_info = adc->cfg->adc_info; > int num_channels = 0, ret; > > - ret = of_property_count_u32_elems(node, "st,adc-channels"); > + ret = device_property_count_u32(dev, "st,adc-channels"); > if (ret > adc_info->max_channels) { > dev_err(&indio_dev->dev, "Bad st,adc-channels?\n"); > return -EINVAL; > @@ -1879,18 +1879,17 @@ static int stm32_adc_get_legacy_chan_count(struct iio_dev *indio_dev, struct stm > num_channels += ret; > } > > - ret = of_property_count_elems_of_size(node, "st,adc-diff-channels", > - sizeof(struct stm32_adc_diff_channel)); > - if (ret > adc_info->max_channels) { > + ret = device_property_count_u32(dev, "st,adc-diff-channels"); > + if ((ret / 2) > adc_info->max_channels) { hmm. The magic '2' that is introduced here kind of looses some of the meaning that existed for the *_count_elems_of_size() Perhaps introduce a define or a comment on why it is 2? > dev_err(&indio_dev->dev, "Bad st,adc-diff-channels?\n"); > return -EINVAL; > - } else if (ret > 0) { > - adc->num_diff = ret; > - num_channels += ret; > + } else if ((ret / 2) > 0) { > + adc->num_diff = ret / 2; > + num_channels += ret / 2; > } > > /* Optional sample time is provided either for each, or all channels */ > - ret = of_property_count_u32_elems(node, "st,min-sample-time-nsecs"); > + ret = device_property_count_u32(dev, "st,min-sample-time-nsecs"); > if (ret > 1 && ret != num_channels) { > dev_err(&indio_dev->dev, "Invalid st,min-sample-time-nsecs\n"); > return -EINVAL; > @@ -1901,21 +1900,20 @@ static int stm32_adc_get_legacy_chan_count(struct iio_dev *indio_dev, struct stm > > static int stm32_adc_legacy_chan_init(struct iio_dev *indio_dev, > struct stm32_adc *adc, > - struct iio_chan_spec *channels) > + struct iio_chan_spec *channels, > + int nchans) > { > - struct device_node *node = indio_dev->dev.of_node; > const struct stm32_adc_info *adc_info = adc->cfg->adc_info; > struct stm32_adc_diff_channel diff[STM32_ADC_CH_MAX]; > + struct device *dev = &indio_dev->dev; > u32 num_diff = adc->num_diff; > int size = num_diff * sizeof(*diff) / sizeof(u32); > - int scan_index = 0, val, ret, i; > - struct property *prop; > - const __be32 *cur; > - u32 smp = 0; > + int scan_index = 0, ret, i; > + u32 smp = 0, nsmps, smps[STM32_ADC_CH_MAX], chans[STM32_ADC_CH_MAX]; > > if (num_diff) { > - ret = of_property_read_u32_array(node, "st,adc-diff-channels", > - (u32 *)diff, size); > + ret = device_property_read_u32_array(dev, "st,adc-diff-channels", > + (u32 *)diff, size); > if (ret) { > dev_err(&indio_dev->dev, "Failed to get diff channels %d\n", ret); > return ret; > @@ -1936,32 +1934,51 @@ static int stm32_adc_legacy_chan_init(struct iio_dev *indio_dev, > } > } > > - of_property_for_each_u32(node, "st,adc-channels", prop, cur, val) { > - if (val >= adc_info->max_channels) { > - dev_err(&indio_dev->dev, "Invalid channel %d\n", val); > + ret = device_property_read_u32_array(dev, "st,adc-channels", chans, > + nchans); > + if (ret) > + return ret; > + > + for (i = 0; i < nchans; i++) { > + if (chans[i] >= adc_info->max_channels) { > + dev_err(&indio_dev->dev, "Invalid channel %d\n", > + chans[i]); > return -EINVAL; > } > > /* Channel can't be configured both as single-ended & diff */ > for (i = 0; i < num_diff; i++) { > - if (val == diff[i].vinp) { > - dev_err(&indio_dev->dev, "channel %d misconfigured\n", val); > + if (chans[i] == diff[i].vinp) { > + dev_err(&indio_dev->dev, "channel %d misconfigured\n", chans[i]); > return -EINVAL; > } > } > - stm32_adc_chan_init_one(indio_dev, &channels[scan_index], val, > - 0, scan_index, false); > + stm32_adc_chan_init_one(indio_dev, &channels[scan_index], > + chans[i], 0, scan_index, false); > scan_index++; > } > > + nsmps = device_property_count_u32(dev, "st,min-sample-time-nsecs"); > + if (nsmps) { > + if (nsmps >= nchans) > + nsmps = nchans; > + > + ret = device_property_read_u32_array(dev, "st,min-sample-time-nsecs", > + smps, nsmps); > + if (ret) > + return ret; > + } > + > for (i = 0; i < scan_index; i++) { > /* > - * Using of_property_read_u32_index(), smp value will only be > - * modified if valid u32 value can be decoded. This allows to > - * get either no value, 1 shared value for all indexes, or one > - * value per channel. > + * This check is used with the above logic so that smp value > + * will only be modified if valid u32 value can be decoded. This > + * allows to get either no value, 1 shared value for all indexes, > + * or one value per channel. The point is to have the same > + * behavior as 'of_property_read_u32_index()'. > */ > - of_property_read_u32_index(node, "st,min-sample-time-nsecs", i, &smp); > + if (i < nsmps) > + smp = smps[i]; > > /* Prepare sampling time settings */ > stm32_adc_smpr_init(adc, channels[i].channel, smp); > @@ -2004,22 +2021,21 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev, > struct stm32_adc *adc, > struct iio_chan_spec *channels) > { > - struct device_node *node = indio_dev->dev.of_node; > const struct stm32_adc_info *adc_info = adc->cfg->adc_info; > - struct device_node *child; > + struct fwnode_handle *child; > const char *name; > int val, scan_index = 0, ret; > bool differential; > u32 vin[2]; > > - for_each_available_child_of_node(node, child) { > - ret = of_property_read_u32(child, "reg", &val); > + device_for_each_child_node(&indio_dev->dev, child) { > + ret = fwnode_property_read_u32(child, "reg", &val); > if (ret) { > dev_err(&indio_dev->dev, "Missing channel index %d\n", ret); > goto err; > } > > - ret = of_property_read_string(child, "label", &name); > + ret = fwnode_property_read_string(child, "label", &name); > /* label is optional */ > if (!ret) { > if (strlen(name) >= STM32_ADC_CH_SZ) { > @@ -2044,7 +2060,7 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev, > } > > differential = false; > - ret = of_property_read_u32_array(child, "diff-channels", vin, 2); > + ret = fwnode_property_read_u32_array(child, "diff-channels", vin, 2); > /* diff-channels is optional */ > if (!ret) { > differential = true; > @@ -2061,7 +2077,7 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev, > stm32_adc_chan_init_one(indio_dev, &channels[scan_index], val, > vin[1], scan_index, differential); > > - ret = of_property_read_u32(child, "st,min-sample-time-ns", &val); > + ret = fwnode_property_read_u32(child, "st,min-sample-time-ns", &val); > /* st,min-sample-time-ns is optional */ > if (!ret) { > stm32_adc_smpr_init(adc, channels[scan_index].channel, val); > @@ -2079,14 +2095,13 @@ static int stm32_adc_generic_chan_init(struct iio_dev *indio_dev, > return scan_index; > > err: > - of_node_put(child); > + fwnode_handle_put(child); > > return ret; > } > > -static int stm32_adc_chan_of_init(struct iio_dev *indio_dev, bool timestamping) > +static int stm32_adc_chan_fw_init(struct iio_dev *indio_dev, bool timestamping) > { > - struct device_node *node = indio_dev->dev.of_node; > struct stm32_adc *adc = iio_priv(indio_dev); > const struct stm32_adc_info *adc_info = adc->cfg->adc_info; > struct iio_chan_spec *channels; > @@ -2096,7 +2111,7 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev, bool timestamping) > for (i = 0; i < STM32_ADC_INT_CH_NB; i++) > adc->int_ch[i] = STM32_ADC_INT_CH_NONE; > > - num_channels = of_get_available_child_count(node); > + num_channels = device_get_child_node_count(&indio_dev->dev); > /* If no channels have been found, fallback to channels legacy properties. */ > if (!num_channels) { > legacy = true; > @@ -2127,7 +2142,8 @@ static int stm32_adc_chan_of_init(struct iio_dev *indio_dev, bool timestamping) > return -ENOMEM; > > if (legacy) > - ret = stm32_adc_legacy_chan_init(indio_dev, adc, channels); > + ret = stm32_adc_legacy_chan_init(indio_dev, adc, channels, > + num_channels); > else > ret = stm32_adc_generic_chan_init(indio_dev, adc, channels); > if (ret < 0) > @@ -2209,9 +2225,6 @@ static int stm32_adc_probe(struct platform_device *pdev) > bool timestamping = false; > int ret; > > - if (!pdev->dev.of_node) > - return -ENODEV; > - > indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); > if (!indio_dev) > return -ENOMEM; > @@ -2220,17 +2233,16 @@ static int stm32_adc_probe(struct platform_device *pdev) > adc->common = dev_get_drvdata(pdev->dev.parent); > spin_lock_init(&adc->lock); > init_completion(&adc->completion); > - adc->cfg = (const struct stm32_adc_cfg *) > - of_match_device(dev->driver->of_match_table, dev)->data; > + adc->cfg = device_get_match_data(dev); > > indio_dev->name = dev_name(&pdev->dev); > - indio_dev->dev.of_node = pdev->dev.of_node; > + device_set_node(&indio_dev->dev, dev_fwnode(&pdev->dev)); > indio_dev->info = &stm32_adc_iio_info; > indio_dev->modes = INDIO_DIRECT_MODE | INDIO_HARDWARE_TRIGGERED; > > platform_set_drvdata(pdev, indio_dev); > > - ret = of_property_read_u32(pdev->dev.of_node, "reg", &adc->offset); > + ret = device_property_read_u32(dev, "reg", &adc->offset); > if (ret != 0) { > dev_err(&pdev->dev, "missing reg property\n"); > return -EINVAL; > @@ -2259,7 +2271,7 @@ static int stm32_adc_probe(struct platform_device *pdev) > } > } > > - ret = stm32_adc_of_get_resolution(indio_dev); > + ret = stm32_adc_fw_get_resolution(indio_dev); > if (ret < 0) > return ret; > > @@ -2276,7 +2288,7 @@ static int stm32_adc_probe(struct platform_device *pdev) > timestamping = true; > } > > - ret = stm32_adc_chan_of_init(indio_dev, timestamping); > + ret = stm32_adc_chan_fw_init(indio_dev, timestamping); > if (ret < 0) > goto err_dma_disable; >