From: Eugen Hristev eugen.hristev@microchip.com
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 --- board/atmel/sama5d2_icp/sama5d2_icp.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/board/atmel/sama5d2_icp/sama5d2_icp.c b/board/atmel/sama5d2_icp/sama5d2_icp.c index 1c28aab..f55ea2c 100644 --- a/board/atmel/sama5d2_icp/sama5d2_icp.c +++ b/board/atmel/sama5d2_icp/sama5d2_icp.c @@ -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)