clk: support hardware-specific debugfs entries

Add a new clk_ops->debug_init method to allow a clock hardware
driver to populate the clock's debugfs directory with entries
beyond those common for every clock.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index fb3c40b4fbe2..1fbcb2b107e7 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -277,6 +277,10 @@ static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry)
         if (!d)
                 goto err_out;
 
+        if (clk->ops->debug_init)
+                if (clk->ops->debug_init(clk->hw, clk->dentry))
+                        goto err_out;
+
         ret = 0;
         goto out;
 
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 939533da93a7..511917416fb0 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -32,6 +32,7 @@
 #define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
 
 struct clk_hw;
+struct dentry;
 
 /**
  * struct clk_ops -  Callback operations for hardware clocks; these are to
@@ -127,6 +128,12 @@ struct clk_hw;
  *              separately via calls to .set_parent and .set_rate.
  *              Returns 0 on success, -EERROR otherwise.
  *
+ * @debug_init: Set up type-specific debugfs entries for this clock.  This
+ *              is called once, after the debugfs directory entry for this
+ *              clock has been created.  The dentry pointer representing that
+ *              directory is provided as an argument.  Called with
+ *              prepare_lock held.  Returns 0 on success, -EERROR otherwise.
+ *
  *
  * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow
  * implementations to split any work between atomic (enable) and sleepable
@@ -165,6 +172,7 @@ struct clk_ops {
         unsigned long   (*recalc_accuracy)(struct clk_hw *hw,
                                            unsigned long parent_accuracy);
         void            (*init)(struct clk_hw *hw);
+        int             (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
 };
 
 /**