Merge tag 'renesas-sh-drivers-for-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas

Pull SH driver updates from Simon Horman:
 "Clean up the clock API on legacy SH to make it more similar to the
  Common Clock Framework.  This will avoid different behaviour in
  drivers shared between legacy and CCF-based platforms (e.g.  SCIF)"

* tag 'renesas-sh-drivers-for-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  drivers: sh: clk: Avoid crashes when passing NULL clocks
  drivers: sh: clk: Remove obsolete and unused clk_round_parent()

2 files changed, 12 insertions, 92 deletions

diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c
index be56b22ca941..92863e3818e5 100644
--- a/drivers/sh/clk/core.c
+++ b/drivers/sh/clk/core.c
@@ -469,6 +469,9 @@ void clk_enable_init_clocks(void)
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+        if (!clk)
+                return 0;
+
         return clk->rate;
 }
 EXPORT_SYMBOL_GPL(clk_get_rate);
@@ -478,6 +481,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
         int ret = -EOPNOTSUPP;
         unsigned long flags;
 
+        if (!clk)
+                return 0;
+
         spin_lock_irqsave(&clock_lock, flags);
 
         if (likely(clk->ops && clk->ops->set_rate)) {
@@ -535,12 +541,18 @@ EXPORT_SYMBOL_GPL(clk_set_parent);
 
 struct clk *clk_get_parent(struct clk *clk)
 {
+        if (!clk)
+                return NULL;
+
         return clk->parent;
 }
 EXPORT_SYMBOL_GPL(clk_get_parent);
 
 long clk_round_rate(struct clk *clk, unsigned long rate)
 {
+        if (!clk)
+                return 0;
+
         if (likely(clk->ops && clk->ops->round_rate)) {
                 unsigned long flags, rounded;
 
@@ -555,94 +567,6 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
 }
 EXPORT_SYMBOL_GPL(clk_round_rate);
 
-long clk_round_parent(struct clk *clk, unsigned long target,
-                      unsigned long *best_freq, unsigned long *parent_freq,
-                      unsigned int div_min, unsigned int div_max)
-{
-        struct cpufreq_frequency_table *freq, *best = NULL;
-        unsigned long error = ULONG_MAX, freq_high, freq_low, div;
-        struct clk *parent = clk_get_parent(clk);
-
-        if (!parent) {
-                *parent_freq = 0;
-                *best_freq = clk_round_rate(clk, target);
-                return abs(target - *best_freq);
-        }
-
-        cpufreq_for_each_valid_entry(freq, parent->freq_table) {
-                if (unlikely(freq->frequency / target <= div_min - 1)) {
-                        unsigned long freq_max;
-
-                        freq_max = (freq->frequency + div_min / 2) / div_min;
-                        if (error > target - freq_max) {
-                                error = target - freq_max;
-                                best = freq;
-                                if (best_freq)
-                                        *best_freq = freq_max;
-                        }
-
-                        pr_debug("too low freq %u, error %lu\n", freq->frequency,
-                                 target - freq_max);
-
-                        if (!error)
-                                break;
-
-                        continue;
-                }
-
-                if (unlikely(freq->frequency / target >= div_max)) {
-                        unsigned long freq_min;
-
-                        freq_min = (freq->frequency + div_max / 2) / div_max;
-                        if (error > freq_min - target) {
-                                error = freq_min - target;
-                                best = freq;
-                                if (best_freq)
-                                        *best_freq = freq_min;
-                        }
-
-                        pr_debug("too high freq %u, error %lu\n", freq->frequency,
-                                 freq_min - target);
-
-                        if (!error)
-                                break;
-
-                        continue;
-                }
-
-                div = freq->frequency / target;
-                freq_high = freq->frequency / div;
-                freq_low = freq->frequency / (div + 1);
-
-                if (freq_high - target < error) {
-                        error = freq_high - target;
-                        best = freq;
-                        if (best_freq)
-                                *best_freq = freq_high;
-                }
-
-                if (target - freq_low < error) {
-                        error = target - freq_low;
-                        best = freq;
-                        if (best_freq)
-                                *best_freq = freq_low;
-                }
-
-                pr_debug("%u / %lu = %lu, / %lu = %lu, best %lu, parent %u\n",
-                         freq->frequency, div, freq_high, div + 1, freq_low,
-                         *best_freq, best->frequency);
-
-                if (!error)
-                        break;
-        }
-
-        if (parent_freq)
-                *parent_freq = best->frequency;
-
-        return error;
-}
-EXPORT_SYMBOL_GPL(clk_round_parent);
-
 #ifdef CONFIG_PM
 static void clks_core_resume(void)
 {
diff --git a/include/linux/sh_clk.h b/include/linux/sh_clk.h
index 1f208b2a1ed6..645896b81244 100644
--- a/include/linux/sh_clk.h
+++ b/include/linux/sh_clk.h
@@ -113,10 +113,6 @@ long clk_rate_div_range_round(struct clk *clk, unsigned int div_min,
 long clk_rate_mult_range_round(struct clk *clk, unsigned int mult_min,
                                unsigned int mult_max, unsigned long rate);
 
-long clk_round_parent(struct clk *clk, unsigned long target,
-                      unsigned long *best_freq, unsigned long *parent_freq,
-                      unsigned int div_min, unsigned int div_max);
-
 #define SH_CLK_MSTP(_parent, _enable_reg, _enable_bit, _status_reg, _flags) \
 {                                                                       \
         .parent         = _parent,                                      \