clk: Add rate constraints to clocks

Adds a way for clock consumers to set maximum and minimum rates. This
can be used for thermal drivers to set minimum rates, or by misc.
drivers to set maximum rates to assure a minimum performance level.

Changes the signature of the determine_rate callback by adding the
parameters min_rate and max_rate.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
[sboyd@codeaurora.org: set req_rate in __clk_init]
Signed-off-by: Michael Turquette <mturquette@linaro.org>
[mturquette@linaro.org: min/max rate for sun6i_ahb1_clk_determine_rate
                        migrated clk-private.h changes to clk.c]

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/mips/alchemy/common/clock.c b/arch/mips/alchemy/common/clock.c
index 48a9dfc55b51..4e65404b3ba3 100644
--- a/arch/mips/alchemy/common/clock.c
+++ b/arch/mips/alchemy/common/clock.c
@@ -373,6 +373,8 @@ static long alchemy_calc_div(unsigned long rate, unsigned long prate,
 }
 
 static long alchemy_clk_fgcs_detr(struct clk_hw *hw, unsigned long rate,
+                                        unsigned long min_rate,
+                                        unsigned long max_rate,
                                         unsigned long *best_parent_rate,
                                         struct clk_hw **best_parent_clk,
                                         int scale, int maxdiv)
@@ -546,6 +548,8 @@ static unsigned long alchemy_clk_fgv1_recalc(struct clk_hw *hw,
 }
 
 static long alchemy_clk_fgv1_detr(struct clk_hw *hw, unsigned long rate,
+                                        unsigned long min_rate,
+                                        unsigned long max_rate,
                                         unsigned long *best_parent_rate,
                                         struct clk_hw **best_parent_clk)
 {
@@ -678,6 +682,8 @@ static unsigned long alchemy_clk_fgv2_recalc(struct clk_hw *hw,
 }
 
 static long alchemy_clk_fgv2_detr(struct clk_hw *hw, unsigned long rate,
+                                        unsigned long min_rate,
+                                        unsigned long max_rate,
                                         unsigned long *best_parent_rate,
                                         struct clk_hw **best_parent_clk)
 {
@@ -897,6 +903,8 @@ static int alchemy_clk_csrc_setr(struct clk_hw *hw, unsigned long rate,
 }
 
 static long alchemy_clk_csrc_detr(struct clk_hw *hw, unsigned long rate,
+                                        unsigned long min_rate,
+                                        unsigned long max_rate,
                                         unsigned long *best_parent_rate,
                                         struct clk_hw **best_parent_clk)
 {