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authorMaxime Ripard <maxime.ripard@free-electrons.com>2012-05-11 15:35:37 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-14 13:25:33 -0700
commite364185f3ed2ecc0a4dbfe2507f20fd5db76c966 (patch)
tree4fbeca090abfdc6b3c8605323606c395c8589916 /drivers/iio
parent5d449e4b2f4cd4c3f1fcf26b79222e6f5758df70 (diff)
IIO: AT91: Add DT support to at91_adc driver
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/at91_adc.c132
1 files changed, 131 insertions, 1 deletions
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index e2eb6139daf..f18a95d8025 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -15,6 +15,8 @@
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -415,6 +417,123 @@ static int at91_adc_read_raw(struct iio_dev *idev,
return -EINVAL;
}
+static int at91_adc_probe_dt(struct at91_adc_state *st,
+ struct platform_device *pdev)
+{
+ struct iio_dev *idev = iio_priv_to_dev(st);
+ struct device_node *node = pdev->dev.of_node;
+ struct device_node *trig_node;
+ int i = 0, ret;
+ u32 prop;
+
+ if (!node)
+ return -EINVAL;
+
+ st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
+
+ if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) {
+ dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->channels_mask = prop;
+
+ if (of_property_read_u32(node, "atmel,adc-num-channels", &prop)) {
+ dev_err(&idev->dev, "Missing adc-num-channels property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->num_channels = prop;
+
+ if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {
+ dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->startup_time = prop;
+
+
+ if (of_property_read_u32(node, "atmel,adc-vref", &prop)) {
+ dev_err(&idev->dev, "Missing adc-vref property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->vref_mv = prop;
+
+ st->registers = devm_kzalloc(&idev->dev,
+ sizeof(struct at91_adc_reg_desc),
+ GFP_KERNEL);
+ if (!st->registers) {
+ dev_err(&idev->dev, "Could not allocate register memory.\n");
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ if (of_property_read_u32(node, "atmel,adc-channel-base", &prop)) {
+ dev_err(&idev->dev, "Missing adc-channel-base property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->registers->channel_base = prop;
+
+ if (of_property_read_u32(node, "atmel,adc-drdy-mask", &prop)) {
+ dev_err(&idev->dev, "Missing adc-drdy-mask property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->registers->drdy_mask = prop;
+
+ if (of_property_read_u32(node, "atmel,adc-status-register", &prop)) {
+ dev_err(&idev->dev, "Missing adc-status-register property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->registers->status_register = prop;
+
+ if (of_property_read_u32(node, "atmel,adc-trigger-register", &prop)) {
+ dev_err(&idev->dev, "Missing adc-trigger-register property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ st->registers->trigger_register = prop;
+
+ st->trigger_number = of_get_child_count(node);
+ st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number *
+ sizeof(struct at91_adc_trigger),
+ GFP_KERNEL);
+ if (!st->trigger_list) {
+ dev_err(&idev->dev, "Could not allocate trigger list memory.\n");
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ for_each_child_of_node(node, trig_node) {
+ struct at91_adc_trigger *trig = st->trigger_list + i;
+ const char *name;
+
+ if (of_property_read_string(trig_node, "trigger-name", &name)) {
+ dev_err(&idev->dev, "Missing trigger-name property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ trig->name = name;
+
+ if (of_property_read_u32(trig_node, "trigger-value", &prop)) {
+ dev_err(&idev->dev, "Missing trigger-value property in the DT.\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ trig->value = prop;
+ trig->is_external = of_property_read_bool(trig_node, "trigger-external");
+ i++;
+ }
+
+ return 0;
+
+error_ret:
+ return ret;
+}
+
static int at91_adc_probe_pdata(struct at91_adc_state *st,
struct platform_device *pdev)
{
@@ -456,7 +575,11 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
st = iio_priv(idev);
- ret = at91_adc_probe_pdata(st, pdev);
+ if (pdev->dev.of_node)
+ ret = at91_adc_probe_dt(st, pdev);
+ else
+ ret = at91_adc_probe_pdata(st, pdev);
+
if (ret) {
dev_err(&pdev->dev, "No platform data available.\n");
ret = -EINVAL;
@@ -657,11 +780,18 @@ static int __devexit at91_adc_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id at91_adc_dt_ids[] = {
+ { .compatible = "atmel,at91sam9260-adc" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, at91_adc_dt_ids);
+
static struct platform_driver at91_adc_driver = {
.probe = at91_adc_probe,
.remove = __devexit_p(at91_adc_remove),
.driver = {
.name = "at91_adc",
+ .of_match_table = of_match_ptr(at91_adc_dt_ids),
},
};