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spi: spidev: Warn loudly if instantiated from DT as "spidev"

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Since spidev is a detail of how Linux controls a device rather than a
description of the hardware in the system we should never have a node
described as "spidev" in DT, any SPI device could be a spidev so this
is just not a useful description.

In order to help prevent users from writing such device trees generate a
warning if spidev is instantiated as a DT node without an ID in the match
table.

Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2015-03-27 16:36:04 -07:00
parent f20fbaad76
commit 956b200a84
1 changed files with 19 additions and 7 deletions
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26
drivers/spi/spidev.c
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@ -703,6 +703,14 @@ static const struct file_operations spidev_fops = {
static struct class *spidev_class;
#ifdef CONFIG_OF
static const struct of_device_id spidev_dt_ids[] = {
{ .compatible = "rohm,dh2228fv" },
{},
};
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
#endif
/*-------------------------------------------------------------------------*/
static int spidev_probe(struct spi_device *spi)
@ -711,6 +719,17 @@ static int spidev_probe(struct spi_device *spi)
int status;
unsigned long minor;
/*
* spidev should never be referenced in DT without a specific
* compatbile string, it is a Linux implementation thing
* rather than a description of the hardware.
*/
if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
dev_err(&spi->dev, "buggy DT: spidev listed directly in DT\n");
WARN_ON(spi->dev.of_node &&
!of_match_device(spidev_dt_ids, &spi->dev));
}
/* Allocate driver data */
spidev = kzalloc(sizeof(*spidev), GFP_KERNEL);
if (!spidev)
@ -777,13 +796,6 @@ static int spidev_remove(struct spi_device *spi)
return 0;
}
static const struct of_device_id spidev_dt_ids[] = {
{ .compatible = "rohm,dh2228fv" },
{},
};
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
static struct spi_driver spidev_spi_driver = {
.driver = {
.name = "spidev",