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board: atmel: sama5d2_icp: standby disable on CAN transceivers in SPL

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The 2 CAN transceivers have a STBDY pin which must be low in order to
operate.
This pin is tied to PB25.
Set it to 0 in bootstrap.
At a later time, this needs to be controlled by Linux power management
system, or requested by some driver as a gpio and tied to 0 during
CAN link up.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Eugen Hristev
2019-05-03 16:24:21 +03:00
parent 57fbd36c66
commit 2950c514e8
1 changed files with 7 additions and 0 deletions
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7
board/atmel/sama5d2_icp/sama5d2_icp.c
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@@ -73,6 +73,12 @@ int misc_init_r(void)
/* SPL */
#ifdef CONFIG_SPL_BUILD
/* must set PB25 low to enable the CAN transceivers */
static void board_can_stdby_dis(void)
{
atmel_pio4_set_pio_output(AT91_PIO_PORTB, 25, 0);
}
/* deassert reset lines for external periph in case of warm reboot */
static void board_reset_additional_periph(void)
{
@@ -111,6 +117,7 @@ void spl_board_init(void)
spl_mmc_init();
#endif
board_reset_additional_periph();
board_can_stdby_dis();
}
void spl_display_print(void)