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authorSoren Brinkmann <soren.brinkmann@xilinx.com>2013-04-02 15:36:56 -0700
committerMike Turquette <mturquette@linaro.org>2013-04-03 12:56:30 -0700
commit056b205316cc3dcf8a67cf813a26ff8a72bf3cb9 (patch)
tree3d98f8d116d5e7541cf41eec72847b2d3673324a /drivers/clk/clk-divider.c
parentf640c0fad698c0e4b07e05373681d3681125d6af (diff)
downloadlinux-056b205316cc3dcf8a67cf813a26ff8a72bf3cb9.tar.bz2
clk: divider: Introduce CLK_DIVIDER_ALLOW_ZERO flag
Dividers which have CLK_DIVIDER_ONE_BASED set have a redundant state, being a divider value of zero. Some hardware implementations allow a zero divider which simply doesn't alter the frequency. I.e. it acts like a divide by one or bypassing the divider. This flag is used to handle such HW in the clk-divider model. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/clk-divider.c')
-rw-r--r--drivers/clk/clk-divider.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 68b402101170..6d9674160430 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -109,8 +109,9 @@ static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
div = _get_div(divider, val);
if (!div) {
- WARN(1, "%s: Invalid divisor for clock %s\n", __func__,
- __clk_get_name(hw->clk));
+ WARN(!(divider->flags & CLK_DIVIDER_ALLOW_ZERO),
+ "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
+ __clk_get_name(hw->clk));
return parent_rate;
}