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iio: dac: dac5571: Fix chip id detection for OF devices 

When matching an OF device, the match mechanism tries all components of
the compatible property. This can result with a device matched with a
compatible string that isn't the first in the compatible list. For
instance, with a compatible property set to

    compatible = "ti,dac081c081", "ti,dac5571";

the driver will match the second compatible string, as the first one
isn't listed in the of_device_id table. The device will however be named
"dac081c081" by the I2C core.

This causes an issue when identifying the chip. The probe function
receives a i2c_device_id that comes from the module's I2C device ID
table. There is no entry in that table for "dac081c081", which results
in a NULL pointer passed to the probe function.

To fix this, add chip_id information in the data field of the OF device
ID table, and retrieve it with device_get_match_data() for OF
devices.

Signed-off-by: Jose Cazarin <joseespiriki@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20220324234340.32402-1-laurent.pinchart@ideasonboard.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jose Cazarin 2022-03-25 01:43:40 +02:00 committed by Jonathan Cameron
parent d926054d55
commit a2a43fd9d8
1 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/iio/dac/ti-dac5571.c
View File

@ -19,6 +19,7 @@
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
enum chip_id {
@ -311,6 +312,7 @@ static int dac5571_probe(struct i2c_client *client,
const struct dac5571_spec *spec;
struct dac5571_data *data;
struct iio_dev *indio_dev;
enum chip_id chip_id;
int ret, i;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
@ -326,7 +328,13 @@ static int dac5571_probe(struct i2c_client *client,
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = dac5571_channels;
spec = &dac5571_spec[id->driver_data];
if (dev_fwnode(dev))
chip_id = (uintptr_t)device_get_match_data(dev);
else
chip_id = id->driver_data;
spec = &dac5571_spec[chip_id];
indio_dev->num_channels = spec->num_channels;
data->spec = spec;
@ -385,15 +393,15 @@ static int dac5571_remove(struct i2c_client *i2c)
}
static const struct of_device_id dac5571_of_id[] = {
{.compatible = "ti,dac5571"},
{.compatible = "ti,dac6571"},
{.compatible = "ti,dac7571"},
{.compatible = "ti,dac5574"},
{.compatible = "ti,dac6574"},
{.compatible = "ti,dac7574"},
{.compatible = "ti,dac5573"},
{.compatible = "ti,dac6573"},
{.compatible = "ti,dac7573"},
{.compatible = "ti,dac5571", .data = (void *)single_8bit},
{.compatible = "ti,dac6571", .data = (void *)single_10bit},
{.compatible = "ti,dac7571", .data = (void *)single_12bit},
{.compatible = "ti,dac5574", .data = (void *)quad_8bit},
{.compatible = "ti,dac6574", .data = (void *)quad_10bit},
{.compatible = "ti,dac7574", .data = (void *)quad_12bit},
{.compatible = "ti,dac5573", .data = (void *)quad_8bit},
{.compatible = "ti,dac6573", .data = (void *)quad_10bit},
{.compatible = "ti,dac7573", .data = (void *)quad_12bit},
{}
};
MODULE_DEVICE_TABLE(of, dac5571_of_id);