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| author | Eddie James <eajames@linux.ibm.com> | 2023-06-12 14:56:45 -0500 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2023-08-09 15:41:59 +0930 |
| commit | 21930d80ed4f76fea3d8773a6c4c8e6f57326fdd (patch) | |
| tree | 15bc403c41a0f632ed1e249507c7c79913dcf422 | |
| parent | d5d8dfb01e1041836cef4d2d69b1c1c991c850fb (diff) | |
| download | lwn-21930d80ed4f76fea3d8773a6c4c8e6f57326fdd.tar.gz lwn-21930d80ed4f76fea3d8773a6c4c8e6f57326fdd.zip | |
fsi: Add aliased device numbering
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>
| -rw-r--r-- | drivers/fsi/fsi-core.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 66706e7de010..778e7d0af34f 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -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); |