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Commit f0b16435 authored by Marek Belisko's avatar Marek Belisko Committed by Jonathan Cameron
Browse files

iio:adc:palmas: add DT support 

Code was found at:
https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1



Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Marek Belisko <marek@goldelico.com> [Fixed minor typos + add channels list to documentation]
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent e08e19c3

Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt

0 → 100644
+48 −0
Original line number Diff line number Diff line 
* 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.

	Values are rounded to derive 0uA, 10uA, 400uA, 800uA.

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>;

		};

	};

	...

};

drivers/iio/adc/palmas_gpadc.c

+47 −5
Original line number Diff line number Diff line
@@ -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;
@@ -469,13 +499,18 @@ 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;

	}



	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) {

		dev_err(&pdev->dev, "iio_device_alloc failed\n");
@@ -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,

	},

};