diff options
| author | Marek Behún | 2021-11-26 14:57:14 +0100 |
|---|---|---|
| committer | Stefan Roese | 2021-12-19 09:50:47 +0100 |
| commit | 08370038df6c92a1bfe1aede55545a505e268305 (patch) | |
| tree | f0d820e89563213dca8f4039a69fa918161e6ddb /board/CZ.NIC/turris_mox | |
| parent | d368e10705146b7ca61a712b202045013493e1b2 (diff) | |
arm: mvebu: turris_mox: Fix unstable board topology reading
The pre-relocation board topology reading in board_fix_fdt() is
unstable: sometimes wrong data are read from the SPI bus.
This is due to wrong order of SPI bus configuration instructions: we
first need to set the pins to SPI mode, and only after that configure
the bus.
Also add a 1ms delay before enabling chip-select, so that the clock pin
is high for some time before reading the bus.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'board/CZ.NIC/turris_mox')
| -rw-r--r-- | board/CZ.NIC/turris_mox/turris_mox.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/board/CZ.NIC/turris_mox/turris_mox.c b/board/CZ.NIC/turris_mox/turris_mox.c index 502f6fc0109..809ce82d201 100644 --- a/board/CZ.NIC/turris_mox/turris_mox.c +++ b/board/CZ.NIC/turris_mox/turris_mox.c @@ -56,9 +56,11 @@ int board_fix_fdt(void *blob) * to read SPI by reading/writing SPI registers directly */ - writel(0x10df, ARMADA_37XX_SPI_CFG); /* put pin from GPIO to SPI mode */ clrbits_le32(ARMADA_37XX_NB_GPIO_SEL, BIT(12)); + /* configure cpol, cpha, prescale */ + writel(0x10df, ARMADA_37XX_SPI_CFG); + mdelay(1); /* enable SPI CS1 */ setbits_le32(ARMADA_37XX_SPI_CTRL, BIT(17)); |