[PATCH v7 5/7] fsi: Add aliased device numbering

Eddie James
2023-03-03T17:05:05Z

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>
---
drivers/fsi/fsi-core.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index d591e68afd11..b77013b9d8a7 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -955,9 +955,34 @@ 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);
--
2.31.1