From: Marek Belisko <ma...@goldelico.com>
Code was found at:
https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1
Signed-off-by: Laxman Dewangan <ldewan...@nvidia.com>
Signed-off-by: Marek Belisko <ma...@goldelico.com> [Fixed minor typos + add
channels list to documentation]
---
.../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.
+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,
},
};
--
2.5.1
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