clk: Add support for enabling/disabling clocks from debugfs

For test and debug purposes, it's simple enough to enable or disable
clocks from shell. Add a new debugfs file 'clk_prepare_enable' that
calls clk_prepare_enable() when writing "1" and clk_disable_unprepare()
when writing "0".

This can have security implications, so only support it when the code
has been modified to #define CLOCK_ALLOW_WRITE_DEBUGFS.

Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>
Link: https://lore.kernel.org/r/20200630003024.6282-1-mdtipton@codeaurora.org
[sboyd@kernel.org: Reword commit text and remove comment update]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 3f588ed..4d455a6 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3039,6 +3039,31 @@ static int clk_rate_set(void *data, u64 val)
 }
 
 #define clk_rate_mode  0644
+
+static int clk_prepare_enable_set(void *data, u64 val)
+{
+       struct clk_core *core = data;
+       int ret = 0;
+
+       if (val)
+               ret = clk_prepare_enable(core->hw->clk);
+       else
+               clk_disable_unprepare(core->hw->clk);
+
+       return ret;
+}
+
+static int clk_prepare_enable_get(void *data, u64 *val)
+{
+       struct clk_core *core = data;
+
+       *val = core->enable_count && core->prepare_count;
+       return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(clk_prepare_enable_fops, clk_prepare_enable_get,
+                        clk_prepare_enable_set, "%llu\n");
+
 #else
 #define clk_rate_set   NULL
 #define clk_rate_mode  0444
@@ -3216,6 +3241,10 @@ static void clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
        debugfs_create_u32("clk_notifier_count", 0444, root, &core->notifier_count);
        debugfs_create_file("clk_duty_cycle", 0444, root, core,
                            &clk_duty_cycle_fops);
+#ifdef CLOCK_ALLOW_WRITE_DEBUGFS
+       debugfs_create_file("clk_prepare_enable", 0644, root, core,
+                           &clk_prepare_enable_fops);
+#endif
 
        if (core->num_parents > 0)
                debugfs_create_file("clk_parent", 0444, root, core,