[2/4] clk: debug: add support for enable/disable/prep/un-prep from debugfs

Commit Message

Tero Kristo Oct. 1, 2019, 9:02 a.m. UTC

The enable/prepare count variables can now be used to enable/disable/
prepare and un-prepare specific clocks. This is very useful for
debugging purposes, but can be considered dangerous. Thus, it is
protected by the same Kconfig option as the clk_rate modification
option.

Signed-off-by: Tero Kristo <[e-mail]>
---
 drivers/clk/clk.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

Patch

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index b0e82193a63d..e0ceecf727c5 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3113,6 +3113,58 @@  static int clk_dbg_rate_set(void *data, u64 val)
 }
 
 DEFINE_SIMPLE_ATTRIBUTE(clk_dbg_option_rate, clk_dbg_rate_get, clk_dbg_rate_set, "%llu\n");
+
+static int clk_dbg_prepare_get(void *data, u64 *val)
+{
+	struct clk_core *core = data;
+
+	*val = core->prepare_count;
+
+	return 0;
+}
+
+static int clk_dbg_prepare_set(void *data, u64 val)
+{
+	struct clk_core *core = data;
+
+	if (val == 1)
+		return clk_core_prepare(core);
+
+	if (val == -1) {
+		clk_core_unprepare(core);
+		return 0;
+	}
+
+	pr_err("1: prepare, -1: unprepare\n");
+	return -EINVAL;
+}
+DEFINE_SIMPLE_ATTRIBUTE(clk_dbg_option_prepare, clk_dbg_prepare_get, clk_dbg_prepare_set, "%llu\n");
+
+static int clk_dbg_enable_get(void *data, u64 *val)
+{
+	struct clk_core *core = data;
+
+	*val = core->enable_count;
+
+	return 0;
+}
+
+static int clk_dbg_enable_set(void *data, u64 val)
+{
+	struct clk_core *core = data;
+
+	if (val == 1)
+		return clk_core_enable(core);
+
+	if (val == -1) {
+		clk_core_disable(core);
+		return 0;
+	}
+
+	pr_err("1: enable, -1: disable\n");
+	return -EINVAL;
+}
+DEFINE_SIMPLE_ATTRIBUTE(clk_dbg_option_enable, clk_dbg_enable_get, clk_dbg_enable_set, "%llu\n");
 #endif
 
 static void clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
@@ -3134,8 +3186,15 @@  static void clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
 	debugfs_create_ulong("clk_accuracy", 0444, root, &core->accuracy);
 	debugfs_create_u32("clk_phase", 0444, root, &core->phase);
 	debugfs_create_file("clk_flags", 0444, root, core, &clk_flags_fops);
+#ifdef CONFIG_COMMON_CLK_DEBUGFS_WRITE_ACCESS
+	debugfs_create_file("clk_prepare_count", 0644,
+			    root, core, &clk_dbg_option_prepare);
+	debugfs_create_file("clk_enable_count", 0644,
+			    core->dentry, core, &clk_dbg_option_enable);
+#else
 	debugfs_create_u32("clk_prepare_count", 0444, root, &core->prepare_count);
 	debugfs_create_u32("clk_enable_count", 0444, root, &core->enable_count);
+#endif
 	debugfs_create_u32("clk_protect_count", 0444, root, &core->protect_count);
 	debugfs_create_u32("clk_notifier_count", 0444, root, &core->notifier_count);
 	debugfs_create_file("clk_duty_cycle", 0444, root, core,