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iio:adc:palmas: add DT support 

Code was found at:
a90856a662%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]
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Marek Belisko 2015-10-16 14:53:39 +02:00 committed by Jonathan Cameron
parent e08e19c331
commit f0b1643581
2 changed files with 95 additions and 5 deletions
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48
Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt Normal file
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@ -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.
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>;
};
};
...
};

52
drivers/iio/adc/palmas_gpadc.c
View File

@ -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,
},
};