When probing spi bus masters from devicetree they got a bus_num
of -1. This works with a single bus master only since all bus masters
had the same bus_num. Detect this and dynamically assign a valid
bus_num.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/spi/spi.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index d273050..f035cc2 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -214,6 +214,7 @@ static LIST_HEAD(spi_master_list);
*/
int spi_register_master(struct spi_master *master)
{
+ static int dyn_bus_id = (1 << 15) - 1;
int status = -ENODEV;
debug("%s: %s:%d\n", __func__, master->dev->name, master->dev->id);
@@ -224,6 +225,10 @@ int spi_register_master(struct spi_master *master)
if (master->num_chipselect == 0)
return -EINVAL;
+ /* convention: dynamically assigned bus IDs count down from the max */
+ if (master->bus_num < 0)
+ master->bus_num = dyn_bus_id--;
+
list_add_tail(&master->list, &spi_master_list);
spi_of_register_slaves(master);
--
1.8.4.rc3
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