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spi: kirkwood: prevent configuring speed exceeding max controller freq

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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>
This commit is contained in:
Marcin Wojtas 2021-04-30 15:26:30 +02:00 committed by Stefan Roese
parent 037818c544
commit 562f8d5b36
1 changed files with 7 additions and 0 deletions
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7
drivers/spi/kirkwood_spi.c
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@ -110,10 +110,17 @@ static int _spi_xfer(struct kwspi_registers *reg, unsigned int bitlen,
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