| Message ID | 20190312210110.30910-4-simon.k.r.goldschmidt@gmail.com |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | arm: socfpga: enable rtc support for the socrates board | expand |
On 12.03.19 22:01, Simon Goldschmidt wrote: > This patch makes the on-board RTC work on the socfpga_socrates board. > This rtc is present on the board, but it does not work (fails with a > timeout). > > This patch adds a weak pull-up on the I2C0-SCL pin connected to the m41t82 > RTC on this board. While the SDA line has a pull-up on the pcb, the pull-up > on the SCL line seems to be missing. To work around this, enable the > weak-pull-up feature on this pin. > > After applying this patch, the rtc timeout is gone and the 'date' command > can access the rtc chip. > > Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: Stefan Roese <sr@denx.de> Thanks, Stefan
diff --git a/board/ebv/socrates/qts/iocsr_config.h b/board/ebv/socrates/qts/iocsr_config.h index 011fa2bac3..18b9c6ce4d 100644 --- a/board/ebv/socrates/qts/iocsr_config.h +++ b/board/ebv/socrates/qts/iocsr_config.h @@ -108,7 +108,7 @@ const unsigned long iocsr_scan_chain2_table[] = { 0x00018004, 0x06001209, 0x00004000, - 0x20002412, + 0x20042412, 0x00904800, 0x00000030, 0x80000000,
This patch makes the on-board RTC work on the socfpga_socrates board. This rtc is present on the board, but it does not work (fails with a timeout). This patch adds a weak pull-up on the I2C0-SCL pin connected to the m41t82 RTC on this board. While the SDA line has a pull-up on the pcb, the pull-up on the SCL line seems to be missing. To work around this, enable the weak-pull-up feature on this pin. After applying this patch, the rtc timeout is gone and the 'date' command can access the rtc chip. Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> --- board/ebv/socrates/qts/iocsr_config.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)