clk: Add support for setting clk_rate via debugfs

For testing, it is useful to be able to specify a clock rate manually.
As this is a dangerous feature, it is not enabled by default.
Users need to modify the source directly and #define
CLOCK_ALLOW_WRITE_DEBUGFS.

This follows the spirit of commit 09c6ecd394105c48 ("regmap: Add support
for writing to regmap registers via debugfs").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lkml.kernel.org/r/20190828132306.19012-1-geert+renesas@glider.be
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index b68e200..9c5b941 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2996,6 +2996,41 @@ static int clk_dump_show(struct seq_file *s, void *data)
 }
 DEFINE_SHOW_ATTRIBUTE(clk_dump);
 
+#undef CLOCK_ALLOW_WRITE_DEBUGFS
+#ifdef CLOCK_ALLOW_WRITE_DEBUGFS
+/*
+ * This can be dangerous, therefore don't provide any real compile time
+ * configuration option for this feature.
+ * People who want to use this will need to modify the source code directly.
+ */
+static int clk_rate_set(void *data, u64 val)
+{
+       struct clk_core *core = data;
+       int ret;
+
+       clk_prepare_lock();
+       ret = clk_core_set_rate_nolock(core, val);
+       clk_prepare_unlock();
+
+       return ret;
+}
+
+#define clk_rate_mode  0644
+#else
+#define clk_rate_set   NULL
+#define clk_rate_mode  0444
+#endif
+
+static int clk_rate_get(void *data, u64 *val)
+{
+       struct clk_core *core = data;
+
+       *val = core->rate;
+       return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(clk_rate_fops, clk_rate_get, clk_rate_set, "%llu\n");
+
 static const struct {
        unsigned long flag;
        const char *name;
@@ -3145,7 +3180,8 @@ static void clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
        root = debugfs_create_dir(core->name, pdentry);
        core->dentry = root;
 
-       debugfs_create_ulong("clk_rate", 0444, root, &core->rate);
+       debugfs_create_file("clk_rate", clk_rate_mode, root, core,
+                           &clk_rate_fops);
        debugfs_create_file("clk_min_rate", 0444, root, core, &clk_min_rate_fops);
        debugfs_create_file("clk_max_rate", 0444, root, core, &clk_max_rate_fops);
        debugfs_create_ulong("clk_accuracy", 0444, root, &core->accuracy);