[PATCH 3/4] clk: debug: add support for enabling / preparing clocks manually

[Tero Kristo]

Add support for enabling / disabling clocks manually from debugfs.
Setting 1 to prepare/enable counts calls corresponding enable routine
once, incrementing the usecounts by 1. Setting the same files as -1
does the unprepare / disable call similarly. Reading both files
returns the current usecount, as is done without this patch.

Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
 drivers/clk/clk.c | 54 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 3429680691bd..b40b3cae0c6b 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3107,6 +3107,56 @@ 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);
+	} else if (val == -1) {
+		clk_core_unprepare(core);
+		return 0;
+	} else {
+		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);
+	} else if (val == -1) {
+		clk_core_disable(core);
+		return 0;
+	} else {
+		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");
+
 static void clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
 {
 	struct dentry *root;
@@ -3121,8 +3171,8 @@ 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);
-	debugfs_create_u32("clk_prepare_count", 0444, root, &core->prepare_count);
-	debugfs_create_u32("clk_enable_count", 0444, root, &core->enable_count);
+	debugfs_create_file("clk_prepare_count", 0666, root, core, &clk_dbg_option_prepare);
+	debugfs_create_file("clk_enable_count", 0666, root, core, &clk_dbg_option_enable);
 	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,
-- 
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