[U-Boot] [PATCH] dm: spi: prevent setting a speed of 0 Hz

[Simon Goldschmidt]

When the device tree is missing a correct spi slave description below
the bus, the 'set_speed' callback can be called with 'speed' == 0 Hz.
At least with cadence qspi, this leads to a division by zero.

Prevent this by initializing speed to 100 kHz in this case, as is
done in 'dm_spi_claim_bus'.

Signed-off-by: Simon Goldschmidt <sgoldschmidt at de.pepperl-fuchs.com>
---

 drivers/spi/spi-uclass.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index e06a603ab1..41ecef77db 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -325,6 +325,8 @@ int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
 	if (!speed) {
 		speed = plat->max_hz;
 		mode = plat->mode;
+		if (!speed)
+			speed = 100000;
 	}
 	ret = spi_set_speed_mode(bus, speed, mode);
 	if (ret)
-- 
2.11.0


Pepperl+Fuchs GmbH, Mannheim
Geschaeftsfuehrer/Managing Directors: Dr.-Ing. Gunther Kegel (Vors./CEO), Werner Guthier, Mehmet Hatiboglu
Vorsitzender des Aufsichtsrats/Chairman of the supervisory board: Claus Michael
Registergericht/Register Court: AG Mannheim HRB 4713

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