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Message-ID: <3279aa9348e7149bfbd433daaa201f2eb5873e1f.1739967040.git.mazziesaccount@gmail.com>
Date: Wed, 19 Feb 2025 14:32:23 +0200
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Matti Vaittinen <mazziesaccount@...il.com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Hugo Villeneuve <hvilleneuve@...onoff.com>,
Nuno Sa <nuno.sa@...log.com>, David Lechner <dlechner@...libre.com>,
Javier Carrasco <javier.carrasco.cruz@...il.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH v3 9/9] iio: adc: ti-ads7924: Respect device tree config
The ti-ads7924 driver ignores the device-tree ADC channel specification
and always exposes all 4 channels to users whether they are present in
the device-tree or not. Additionally, the "reg" values in the channel
nodes are ignored, although an error is printed if they are out of range.
Register only the channels described in the device-tree, and use the reg
property as a channel ID.
Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
Revision history:
v2 => v3: New patch
Please note that this is potentially breaking existing users if they
have wrong values in the device-tree. I believe the device-tree should
ideally be respected, and if it says device X has only one channel, then
we should believe it and not register 4. Well, we don't live in the
ideal world, so even though I believe this is TheRightThingToDo - it may
cause havoc because correct device-tree has not been required from the
day 1. So, please review and test and apply at your own risk :)
As a side note, this might warrant a fixes tag but the adc-helper -stuff
is hardly worth to be backported... (And I've already exceeded my time
budget with this series - hence I'll leave crafting backportable fix to
TI people ;) )
This has only been compile tested! All testing is highly appreciated.
---
drivers/iio/adc/ti-ads7924.c | 80 +++++++++++++++++-------------------
1 file changed, 37 insertions(+), 43 deletions(-)
diff --git a/drivers/iio/adc/ti-ads7924.c b/drivers/iio/adc/ti-ads7924.c
index b1f745f75dbe..a5b8f7c81b8a 100644
--- a/drivers/iio/adc/ti-ads7924.c
+++ b/drivers/iio/adc/ti-ads7924.c
@@ -22,6 +22,7 @@
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
+#include <linux/iio/adc-helpers.h>
#include <linux/iio/iio.h>
#include <linux/iio/types.h>
@@ -119,15 +120,12 @@
#define ADS7924_TOTAL_CONVTIME_US (ADS7924_PWRUPTIME_US + ADS7924_ACQTIME_US + \
ADS7924_CONVTIME_US)
-#define ADS7924_V_CHAN(_chan, _addr) { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .channel = _chan, \
- .address = _addr, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
- .datasheet_name = "AIN"#_chan, \
-}
+static const struct iio_chan_spec ads7924_chan_template = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+};
struct ads7924_data {
struct device *dev;
@@ -182,13 +180,6 @@ static const struct regmap_config ads7924_regmap_config = {
.writeable_reg = ads7924_is_writeable_reg,
};
-static const struct iio_chan_spec ads7924_channels[] = {
- ADS7924_V_CHAN(0, ADS7924_DATA0_U_REG),
- ADS7924_V_CHAN(1, ADS7924_DATA1_U_REG),
- ADS7924_V_CHAN(2, ADS7924_DATA2_U_REG),
- ADS7924_V_CHAN(3, ADS7924_DATA3_U_REG),
-};
-
static int ads7924_get_adc_result(struct ads7924_data *data,
struct iio_chan_spec const *chan, int *val)
{
@@ -251,32 +242,38 @@ static const struct iio_info ads7924_info = {
.read_raw = ads7924_read_raw,
};
-static int ads7924_get_channels_config(struct device *dev)
+static const struct iio_adc_props ads7924_chan_props = {
+ .required = IIO_ADC_CHAN_PROP_TYPE_REG,
+};
+
+static int ads7924_get_channels_config(struct iio_dev *indio_dev,
+ struct device *dev)
{
- struct fwnode_handle *node;
- int num_channels = 0;
+ struct iio_chan_spec *chan_array;
+ int num_channels = 0, i;
- device_for_each_child_node(dev, node) {
- u32 pval;
- unsigned int channel;
+ num_channels = devm_iio_adc_device_alloc_chaninfo(dev,
+ &ads7924_chan_template, &chan_array,
+ &ads7924_chan_props);
- if (fwnode_property_read_u32(node, "reg", &pval)) {
- dev_err(dev, "invalid reg on %pfw\n", node);
- continue;
- }
+ if (num_channels < 0)
+ return num_channels;
- channel = pval;
- if (channel >= ADS7924_CHANNELS) {
- dev_err(dev, "invalid channel index %d on %pfw\n",
- channel, node);
- continue;
- }
+ if (!num_channels)
+ return -EINVAL;
+
+ for (i = 0; i < num_channels; i++) {
+ static const char * const datasheet_names[] = {
+ "AIN0", "AIN1", "AIN2", "AIN3"
+ };
+ int ch_id = chan_array[i].channel;
- num_channels++;
+ chan_array[i].address = ADS7924_DATA0_U_REG + ch_id;
+ chan_array[i].datasheet_name = datasheet_names[ch_id];
}
- if (!num_channels)
- return -EINVAL;
+ indio_dev->channels = chan_array;
+ indio_dev->num_channels = num_channels;
return 0;
}
@@ -370,18 +367,15 @@ static int ads7924_probe(struct i2c_client *client)
mutex_init(&data->lock);
- indio_dev->name = "ads7924";
- indio_dev->modes = INDIO_DIRECT_MODE;
-
- indio_dev->channels = ads7924_channels;
- indio_dev->num_channels = ARRAY_SIZE(ads7924_channels);
- indio_dev->info = &ads7924_info;
-
- ret = ads7924_get_channels_config(dev);
+ ret = ads7924_get_channels_config(indio_dev, dev);
if (ret < 0)
return dev_err_probe(dev, ret,
"failed to get channels configuration\n");
+ indio_dev->name = "ads7924";
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &ads7924_info;
+
data->regmap = devm_regmap_init_i2c(client, &ads7924_regmap_config);
if (IS_ERR(data->regmap))
return dev_err_probe(dev, PTR_ERR(data->regmap),
--
2.48.1
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