spi: kirkwood: prevent configuring speed exceeding max controller freq
This patch adds a limitation in the kirkwood_spi driver
set_speed hook, which prevents setting too high transfer
speed.
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Kostya Porotchkin <kostap@marvell.com>
Tested-by: Kostya Porotchkin <kostap@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/spi/kirkwood_spi.c b/drivers/spi/kirkwood_spi.c
index 3dc62f3..063ed5f 100644
--- a/drivers/spi/kirkwood_spi.c
+++ b/drivers/spi/kirkwood_spi.c
@@ -110,10 +110,17 @@
static int mvebu_spi_set_speed(struct udevice *bus, uint hz)
{
struct mvebu_spi_plat *plat = dev_get_plat(bus);
+ struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
struct kwspi_registers *reg = plat->spireg;
u32 data, divider;
unsigned int spr, sppr;
+ if (hz > spi->max_hz) {
+ debug("%s: limit speed to the max_hz of the bus %d\n",
+ __func__, spi->max_hz);
+ hz = spi->max_hz;
+ }
+
/*
* Calculate spi clock prescaller using max_hz.
* SPPR is SPI Baud Rate Pre-selection, it holds bits 5 and 7:6 in