On 16/10/15 13:53, 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> > Signed-off-by: Marek Belisko <marek@xxxxxxxxxxxxx> [Fixed minor typos + add channels list to documentation] I am happy with your responses to Lars and that kind of covers what Mark raised as well. One typo correction applied. Applied to the togreg branch of iio.git Thanks, Jonathan > --- > .../devicetree/bindings/iio/adc/palmas-gpadc.txt | 48 ++++++++++++++++++++ > drivers/iio/adc/palmas_gpadc.c | 52 +++++++++++++++++++--- > 2 files changed, 95 insertions(+), 5 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..a6de996 > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt > @@ -0,0 +1,48 @@ > +* Palmas general purpose ADC IP block devicetree bindings > + > +Channels list: > + 0 battery type > + 1 battery temp NTC (optional current source) > + 2 GP > + 3 temp (with ext. diode, optional current source) > + 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". > +- #io-channel-cells: Should be set to <1>. > + > +Optional sub-nodes: > +ti,channel0-current-microamp: Channel 0 current in uA. > + Values are rounded to derive 0uA, 5uA, 15uA, 20uA. > +ti,channel3-current-microamp: Channel 3 current in uA. > + Valid are rounded to derive 0uA, 10uA, 400uA, 800uA. Values > +ti,enable-extended-delay: Enable extended delay. > + > +Example: > + > +pmic { > + compatible = "ti,twl6035-pmic", "ti,palmas-pmic"; > + ... > + gpadc { > + compatible = "ti,palmas-gpadc"; > + interrupts = <18 0 > + 16 0 > + 17 0>; > + #io-channel-cells = <1>; > + ti,channel0-current-microamp = <5>; > + ti,channel3-current-microamp = <10>; > + }; > + }; > + ... > +}; > diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c > index 71763c5..f42eb8a 100644 > --- a/drivers/iio/adc/palmas_gpadc.c > +++ b/drivers/iio/adc/palmas_gpadc.c > @@ -21,6 +21,8 @@ > #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> > @@ -460,6 +462,34 @@ static const struct iio_chan_spec palmas_gpadc_iio_channel[] = { > PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), > }; > > +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; > + int ret; > + u32 pval; > + > + 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"); > + > + *gpadc_pdata = gp_data; > + > + return 0; > +} > + > static int palmas_gpadc_probe(struct platform_device *pdev) > { > struct palmas_gpadc *adc; > @@ -469,12 +499,17 @@ static int palmas_gpadc_probe(struct platform_device *pdev) > 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; > - } > > - gpadc_pdata = pdata->gpadc_pdata; > + 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; > + } > + if (!gpadc_pdata) > + return -EINVAL; > > indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); > if (!indio_dev) { > @@ -790,12 +825,19 @@ 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, > .driver = { > .name = MOD_NAME, > .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
