On 23/09/15 13:49, H. Nikolaus Schaller wrote: > From: Marek Belisko <marek@xxxxxxxxxxxxx> > > Code was found at: > https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1 > > Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> > [Fixed minor typos + add channels list to documentation] > Signed-off-by: Marek Belisko <marek@xxxxxxxxxxxxx> Various commments inline. You've run into the region of previous arguments over driver bindings... Mark Rutland, one for you to comment on as I know you love our bindings ;) and yes we haven't done anything about them in two years or so since you last moaned about them to me :( > --- > .../devicetree/bindings/iio/adc/palmas-gpadc.txt | 67 +++++++++++ > drivers/iio/adc/palmas_gpadc.c | 130 +++++++++++++++++---- > 2 files changed, 175 insertions(+), 22 deletions(-) > create mode 100644 Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt > > diff --git a/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt > new file mode 100644 > index 0000000..a5a33ba > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt > @@ -0,0 +1,67 @@ > +* Palmas general purpose ADC IP block devicetree bindings > + > +Channels list: > + 0 battery type > + 1 battery temp NTC tab vs space fun. > + 2 GP > + 3 temp (with ext. diode) > + 4 GP > + 5 GP > + 6 VBAT_SENSE > + 7 VCC_SENSE > + 8 Backup Battery voltage > + 9 external charger (VCHG) > + 10 VBUS > + 11 DC-DC current probe (how does this work?) > + 12 internal die temp > + 13 internal die temp > + 14 USB ID pin voltage > + 15 test network > + > +Required properties: > +- compatible : Must be "ti,palmas-gpadc". > + > +Optional sub-nodes: > +ti,channel0-current-microamp: Channel 0 current in uA. > + Valid values 0uA, 5uA, 15uA, 20uA. > +ti,channel3-current-microamp: Channel 3 current in uA. > + Valid value 0uA, 10uA, 400uA, 800uA. > +ti,enable-channel3-dual-current: Enable dual current on channel 3. > +ti,enable-extended-delay: Enable extended delay. > + > +Optional sub-node: > +The Palmas ADC node has optional subnode to define the iio mapping. > +It is the name with "iio_map". This node has again subnode to define > +the property of the channel. The sub subnode has following properties: > +- ti,adc-channel-number: ADC channel number. > +- ti,adc-consumer-device: Consumer device name. > +- ti,adc-consumer-channel: ADC consumer channel name. > + > +Example: > + > +pmic { > + compatible = "ti,twl6035-pmic", "ti,palmas-pmic"; > + ... > + gpadc { > + compatible = "ti,palmas-gpadc"; > + interrupts = <18 0 > + 16 0 > + 17 0>; > + ti,channel0-current-microamp = <5>; > + ti,channel3-current-microamp = <10>; > + iio_map { > + ch1 { > + ti,adc-channel-number = <1>; > + ti,adc-consumer-device = "generic-adc-thermal.0"; > + ti,adc-consumer-channel ="battery-temp-channel"; > + }; > + > + ch6 { > + ti,adc-channel-number = <6>; > + ti,adc-consumer-device = "palmas-battery"; > + ti,adc-consumer-channel ="vbat_channel"; > + }; See comments below. There is an existing iio-consumer binding. Various uses of it have caused complaints from the device tree guys in the past. I'd be interested to get their feedback on this use case. > + }; > + }; > + ... > +}; > diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c > index 17abb28..bc4db43 100644 > --- a/drivers/iio/adc/palmas_gpadc.c > +++ b/drivers/iio/adc/palmas_gpadc.c > @@ -20,6 +20,8 @@ > #include <linux/pm.h> > #include <linux/mfd/palmas.h> > #include <linux/completion.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > #include <linux/iio/iio.h> > #include <linux/iio/machine.h> > #include <linux/iio/driver.h> > @@ -434,20 +436,97 @@ static const struct iio_chan_spec palmas_gpadc_iio_channel[] = { > PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE), > }; > > +static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev, > + struct palmas_gpadc_platform_data **gpadc_pdata) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct palmas_gpadc_platform_data *gp_data; > + struct device_node *map_node; > + struct device_node *child; > + struct iio_map *palmas_iio_map; > + int ret; > + u32 pval; > + int nmap, nvalid_map; > + > + gp_data = devm_kzalloc(&pdev->dev, sizeof(*gp_data), GFP_KERNEL); > + if (!gp_data) > + return -ENOMEM; > + > + ret = of_property_read_u32(np, "ti,channel0-current-microamp", &pval); > + if (!ret) > + gp_data->ch0_current = pval; > + > + ret = of_property_read_u32(np, "ti,channel3-current-microamp", &pval); > + if (!ret) > + gp_data->ch3_current = pval; > + > + gp_data->extended_delay = of_property_read_bool(np, > + "ti,enable-extended-delay"); > + > + map_node = of_get_child_by_name(np, "iio_map"); > + if (!map_node) { > + dev_warn(&pdev->dev, "IIO map table not found\n"); > + goto done; > + } > + > + nmap = of_get_child_count(map_node); > + if (!nmap) > + goto done; > + > + nmap++; > + palmas_iio_map = devm_kzalloc(&pdev->dev, > + sizeof(*palmas_iio_map) * nmap, GFP_KERNEL); > + if (!palmas_iio_map) > + goto done; > + > + nvalid_map = 0; > + for_each_child_of_node(map_node, child) { > + ret = of_property_read_u32(child, "ti,adc-channel-number", > + &pval); > + if (!ret && pval < ARRAY_SIZE(palmas_gpadc_iio_channel)) > + palmas_iio_map[nvalid_map].adc_channel_label = > + palmas_gpadc_iio_channel[pval].datasheet_name; > + of_property_read_string(child, "ti,adc-consumer-device", > + &palmas_iio_map[nvalid_map].consumer_dev_name); > + of_property_read_string(child, "ti,adc-consumer-channel", > + &palmas_iio_map[nvalid_map].consumer_channel); Hmm. These aren't TI specific, and there are already IIO bindings documented for consumers at Documentation/devicetree/bindings/iio/iio-bindings.txt. They have caused some issues in the past due to binding to devices that are linux specific convenience functions. I fear that is sort of the case here with your thermal binding, but we can see what response we get. Mark Rutland is IIRC the most vocal on this :) The current plan for iio-hwmon which caused all the controversy is to look at moving the decision to create the mapping entirely into userspace via configfs and hence make it a clear policy decision rather than claiming that changing user interface is a hardware mapping. > + dev_dbg(&pdev->dev, > + "Channel %s consumer dev %s and consumer channel %s\n", > + palmas_iio_map[nvalid_map].adc_channel_label, > + palmas_iio_map[nvalid_map].consumer_dev_name, > + palmas_iio_map[nvalid_map].consumer_channel); > + nvalid_map++; > + } > + palmas_iio_map[nvalid_map].adc_channel_label = NULL; > + palmas_iio_map[nvalid_map].consumer_dev_name = NULL; > + palmas_iio_map[nvalid_map].consumer_channel = NULL; > + > + gp_data->iio_maps = palmas_iio_map; > + > +done: > + *gpadc_pdata = gp_data; blank line here. > + return 0; > +} > + > static int palmas_gpadc_probe(struct platform_device *pdev) > { > struct palmas_gpadc *adc; > struct palmas_platform_data *pdata; > - struct palmas_gpadc_platform_data *adc_pdata; > + struct palmas_gpadc_platform_data *gpadc_pdata = NULL; This rename should not be here. It adds a lot of churn to the patch and makes it harder to review. Fix it in the previous patch. > struct iio_dev *iodev; > int ret, i; > > pdata = dev_get_platdata(pdev->dev.parent); > - if (!pdata || !pdata->gpadc_pdata) { > - dev_err(&pdev->dev, "No platform data\n"); > - return -ENODEV; > + if (pdata && pdata->gpadc_pdata) > + gpadc_pdata = pdata->gpadc_pdata; > + > + if (!gpadc_pdata && pdev->dev.of_node) { > + ret = palmas_gpadc_get_adc_dt_data(pdev, &gpadc_pdata); > + if (ret < 0) > + return ret; > } > - adc_pdata = pdata->gpadc_pdata; > + if (!gpadc_pdata) > + return -EINVAL; > > iodev = iio_device_alloc(sizeof(*adc)); > if (!iodev) { > @@ -455,8 +534,8 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > return -ENOMEM; > } > > - if (adc_pdata->iio_maps) { > - ret = iio_map_array_register(iodev, adc_pdata->iio_maps); > + if (gpadc_pdata->iio_maps) { > + ret = iio_map_array_register(iodev, gpadc_pdata->iio_maps); > if (ret < 0) { > dev_err(&pdev->dev, "iio_map_array_register failed\n"); > goto out; > @@ -470,7 +549,7 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > init_completion(&adc->conv_completion); > dev_set_drvdata(&pdev->dev, iodev); > > - adc->auto_conversion_period = adc_pdata->auto_conversion_period_ms; > + adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms; > adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ); > ret = request_threaded_irq(adc->irq, NULL, > palmas_gpadc_irq, > @@ -482,8 +561,8 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > goto out_unregister_map; > } > > - if (adc_pdata->adc_wakeup1_data) { > - memcpy(&adc->wakeup1_data, adc_pdata->adc_wakeup1_data, > + if (gpadc_pdata->adc_wakeup1_data) { > + memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data, > sizeof(adc->wakeup1_data)); > adc->wakeup1_enable = true; > adc->irq_auto_0 = platform_get_irq(pdev, 1); > @@ -498,8 +577,8 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > } > } > > - if (adc_pdata->adc_wakeup2_data) { > - memcpy(&adc->wakeup2_data, adc_pdata->adc_wakeup2_data, > + if (gpadc_pdata->adc_wakeup2_data) { > + memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data, > sizeof(adc->wakeup2_data)); > adc->wakeup2_enable = true; > adc->irq_auto_1 = platform_get_irq(pdev, 2); > @@ -514,25 +593,25 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > } > } > > - if (adc_pdata->ch0_current == 0) > + if (gpadc_pdata->ch0_current == 0) > adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0; > - else if (adc_pdata->ch0_current <= 5) > + else if (gpadc_pdata->ch0_current <= 5) > adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5; > - else if (adc_pdata->ch0_current <= 15) > + else if (gpadc_pdata->ch0_current <= 15) > adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15; > else > adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20; > > - if (adc_pdata->ch3_current == 0) > + if (gpadc_pdata->ch3_current == 0) > adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0; > - else if (adc_pdata->ch3_current <= 10) > + else if (gpadc_pdata->ch3_current <= 10) > adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10; > - else if (adc_pdata->ch3_current <= 400) > + else if (gpadc_pdata->ch3_current <= 400) > adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400; > else > adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800; > > - adc->extended_delay = adc_pdata->extended_delay; > + adc->extended_delay = gpadc_pdata->extended_delay; > > iodev->name = MOD_NAME; > iodev->dev.parent = &pdev->dev; > @@ -559,15 +638,15 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > return 0; > > out_irq_auto1_free: > - if (adc_pdata->adc_wakeup2_data) > + if (gpadc_pdata->adc_wakeup2_data) > free_irq(adc->irq_auto_1, adc); > out_irq_auto0_free: > - if (adc_pdata->adc_wakeup1_data) > + if (gpadc_pdata->adc_wakeup1_data) > free_irq(adc->irq_auto_0, adc); > out_irq_free: > free_irq(adc->irq, adc); > out_unregister_map: > - if (adc_pdata->iio_maps) > + if (gpadc_pdata->iio_maps) > iio_map_array_unregister(iodev); > out: > iio_device_free(iodev); > @@ -769,6 +848,12 @@ static const struct dev_pm_ops palmas_pm_ops = { > palmas_gpadc_resume) > }; > > +static const struct of_device_id of_palmas_gpadc_match_tbl[] = { > + { .compatible = "ti,palmas-gpadc", }, > + { /* end */ } > +}; > +MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl); > + > static struct platform_driver palmas_gpadc_driver = { > .probe = palmas_gpadc_probe, > .remove = palmas_gpadc_remove, > @@ -776,6 +861,7 @@ static struct platform_driver palmas_gpadc_driver = { > .name = MOD_NAME, > .owner = THIS_MODULE, > .pm = &palmas_pm_ops, > + .of_match_table = of_palmas_gpadc_match_tbl, > }, > }; > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
