clk: eyeq: Skip post-divisor when computing PLL frequency

The output of the PLL is routed before the post-divisor so it should be
ignored when computing the frequency of the PLL, functional change is
implemented to reflect how the clock signal is wired internally.

For the PLL of the EyeQ5, EyeQ6L, and EyeQ6H, this change has no impact
as the post-divisor is either reported as disabled or set to 1. The PLL
frequency is the same before and after the post-divisor.

For the PLL in EyeQ6Lplus, however, the post-divisor is not 1, so it must
be ignored to compute the correct frequency.

Signed-off-by: Benoît Monin <benoit.monin@bootlin.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/drivers/clk/clk-eyeq.c b/drivers/clk/clk-eyeq.c
index 81137269352da5200fe6ddeee11230de70a5655f..5166b65382a965108d705cade09ec759d988a72f 100644 (file)
--- a/drivers/clk/clk-eyeq.c
+++ b/drivers/clk/clk-eyeq.c
@@ -177,8 +177,6 @@ static int eqc_pll_parse_registers(u32 r0, u32 r1, unsigned long *mult,
 
        *mult = FIELD_GET(PCSR0_INTIN, r0);
        *div = FIELD_GET(PCSR0_REF_DIV, r0);
-       if (r0 & PCSR0_FOUTPOSTDIV_EN)
-               *div *= FIELD_GET(PCSR0_POST_DIV1, r0) * FIELD_GET(PCSR0_POST_DIV2, r0);
 
        /* Fractional mode, in 2^20 (0x100000) parts. */
        if (r0 & PCSR0_DSM_EN) {