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SubjectRe: [PATCH v3 2/3] iio:adc:palmas: add DT support
From
Date
On 16/10/15 13:53, H. Nikolaus Schaller wrote:
> From: Marek Belisko <marek@goldelico.com>
>
> Code was found at:
> https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1
>
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
> Signed-off-by: Marek Belisko <marek@goldelico.com> [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,
> },
> };
>
>



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