[U-Boot] [PATCH v2] mx6: clock: Fix the calculation of PLL_ENET frequency

[Fabio Estevam <festevam@gmail.com>]

From: Fabio Estevam <fabio.estevam@freescale.com>

According to the mx6 quad reference manual, the DIV_SELECT field of register
CCM_ANALOG_PLL_ENETn has the following meaning:

"Controls the frequency of the ethernet reference clock.
- 00 - 25MHz
- 01 - 50MHz
- 10 - 100MHz
- 11 - 125MHz"

Current logic does not handle the 25MHz case correctly, so fix it.

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
Changes since v1:
- Use a single expression that correctly computes the frequency for all
the DIV_SELECT combination (Troy Kisky)

 arch/arm/cpu/armv7/mx6/clock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
index 873d9d0..20c7e70 100644
--- a/arch/arm/cpu/armv7/mx6/clock.c
+++ b/arch/arm/cpu/armv7/mx6/clock.c
@@ -94,7 +94,7 @@ static u32 decode_pll(enum pll_clocks pll, u32 infreq)
 		div = __raw_readl(&imx_ccm->analog_pll_enet);
 		div &= BM_ANADIG_PLL_ENET_DIV_SELECT;
 
-		return (div == 3 ? 125000000 : 25000000 * (div << 1));
+		return 25000000 * (div + (div >> 1) + 1);
 	default:
 		return 0;
 	}
-- 
1.8.1.2