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fsi: Add aliased device numbering

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The I2C and SPI subsystems can use an aliased name to number the device.
Add similar support to the FSI subsystem for any device type.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20230612195657.245125-3-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Eddie James 2023-06-12 14:56:45 -05:00 committed by Joel Stanley
parent d5d8dfb01e
commit 21930d80ed
1 changed files with 25 additions and 0 deletions
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25
drivers/fsi/fsi-core.c
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@ -934,9 +934,34 @@ static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type,
return 0;
}
static const char *const fsi_dev_type_names[] = {
"cfam",
"sbefifo",
"scom",
"occ",
};
int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
dev_t *out_dev, int *out_index)
{
if (fdev->dev.of_node) {
int aid = of_alias_get_id(fdev->dev.of_node, fsi_dev_type_names[type]);
if (aid >= 0) {
int id = (aid << 4) | type;
id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL);
if (id >= 0) {
*out_index = aid;
*out_dev = fsi_base_dev + id;
return 0;
}
if (id != -ENOSPC)
return id;
}
}
return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index);
}
EXPORT_SYMBOL_GPL(fsi_get_new_minor);