redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

clk: at91: sam9x60: fix programmable clock prescaler 

The prescaler works as parent rate divided by (PRES + 1) (is_pres_direct == 1)
It does not work in the way of parent rate shifted to the right by (PRES + 1),
which means division by 2^(PRES + 1) (is_pres_direct == 0)
Thus is_pres_direct must be enabled for this SoC, to make the right computation.
This field was added in
commit 45b0668211 ("clk: at91: fix programmable clock for sama5d2")
SAM9X60 has the same field as SAMA5D2 in the PCK

Fixes: 01e2113de9 ("clk: at91: add sam9x60 pmc driver")
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Link: https://lkml.kernel.org/r/1575977088-16781-1-git-send-email-eugen.hristev@microchip.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
alistair/sensors
Eugen Hristev 2019-12-10 11:25:19 +00:00 committed by Stephen Boyd
parent db2f44820a
commit 66d9f5214c
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/clk/at91/sam9x60.c
View File

@ -47,6 +47,7 @@ static const struct clk_programmable_layout sam9x60_programmable_layout = {
.pres_shift = 8,
.css_mask = 0x1f,
.have_slck_mck = 0,
.is_pres_direct = 1,
};
static const struct clk_pcr_layout sam9x60_pcr_layout = {