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>
diff --git a/board/CZ.NIC/turris_mox/turris_mox.c b/board/CZ.NIC/turris_mox/turris_mox.c
index 502f6fc..809ce82 100644
--- a/board/CZ.NIC/turris_mox/turris_mox.c
+++ b/board/CZ.NIC/turris_mox/turris_mox.c
@@ -56,9 +56,11 @@
* 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));