[PATCH 0/4] Introduce clk_find_nearest_rate()

[PATCH 0/4] Introduce clk_find_nearest_rate()

[Soren Brinkmann]

On Zynq I encountered issues due to rounding here and there. Often the
issue would have been resolved by rounding towards the requested
frequency. Unfortunately, the CCF does not specify  the behavior of
clk_round_rate() in terms of rounding, making this proposed API
call useful for certain use-cases.

An RFC of this series has been discussed here:
https://lkml.org/lkml/2014/5/14/694

Mike: IIRC, you wanted to fix the return type of __clk_round_rate(). Do
you have any patches for that already? I couldn't find anything in
clk-next.

Patch 1 adds the new API call.
2 and 3 apply the new API.
And 4 is a minor fixup of the Zynq DT. The frequencies in the Zynq OPPs
had been specified taking this rounding issues into account, which
is no longer required with this patchset.

	Thanks,
	Sören


Soren Brinkmann (4):
  clk: Introduce 'clk_find_nearest_rate()'
  cpufreq: cpu0: Use clk_find_nearest_rate()
  net: macb: Use clk_find_nearest_rate() API
  ARM: zynq: dt: Use properly rounded frequencies in OPPs

 arch/arm/boot/dts/zynq-7000.dtsi    |  4 +--
 drivers/clk/clk.c                   | 57 +++++++++++++++++++++++++++++++++++++
 drivers/cpufreq/cpufreq-cpu0.c      |  3 +-
 drivers/net/ethernet/cadence/macb.c |  2 +-
 include/linux/clk.h                 |  9 ++++++
 5 files changed, 71 insertions(+), 4 deletions(-)

-- 
2.0.1.1.gfbfc394

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[PATCH 3/4] net: macb: Use clk_find_nearest_rate() API

[Soren Brinkmann]

The Ethernet clock has to match the specified frequencies as accurately
as possible. clk_round_rate() does not specify how rounding is
implemented. Hence use clk_find_nearest_rate().

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---

 drivers/net/ethernet/cadence/macb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index e9daa072ebb4..7b7f5eb1b341 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -223,7 +223,7 @@ static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
 		return;
 	}
 
-	rate_rounded = clk_round_rate(clk, rate);
+	rate_rounded = clk_find_nearest_rate(clk, rate);
 	if (rate_rounded < 0)
 		return;
 
-- 
2.0.1.1.gfbfc394