clk: Add set_rate_and_parent() op

Some of Qualcomm's clocks can change their parent and rate at the
same time with a single register write. Add support for this
hardware to the common clock framework by adding a new
set_rate_and_parent() op. When the clock framework determines
that both the parent and the rate are going to change during
clk_set_rate() it will call the .set_rate_and_parent() op if
available and fall back to calling .set_parent() followed by
.set_rate() otherwise.

Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/Documentation/clk.txt b/Documentation/clk.txt
index eb20198783cd..699ef2a323b1 100644
--- a/Documentation/clk.txt
+++ b/Documentation/clk.txt
@@ -77,6 +77,9 @@ the operations defined in clk.h:
                 int             (*set_parent)(struct clk_hw *hw, u8 index);
                 u8              (*get_parent)(struct clk_hw *hw);
                 int             (*set_rate)(struct clk_hw *hw, unsigned long);
+                int             (*set_rate_and_parent)(struct clk_hw *hw,
+                                            unsigned long rate,
+                                            unsigned long parent_rate, u8 index);
                 unsigned long   (*recalc_accuracy)(struct clk_hw *hw,
                                                    unsigned long parent_accuracy);
                 void            (*init)(struct clk_hw *hw);