[v2,4/6] reset-controller: ti: introduce a new reset handler

[Crystal Guo]

Add ti_syscon_reset() to integrate assert and deassert together.
If some modules need do serialized assert and deassert operations
to reset itself, reset_control_reset can be called for convenience.

Change-Id: I9046992b115a46f3594de57fa89c6a2de9957d49
---
 drivers/reset/reset-ti-syscon.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/reset/reset-ti-syscon.c b/drivers/reset/reset-ti-syscon.c
index a2635c21db7f..1c74bcb9a6c3 100644
--- a/drivers/reset/reset-ti-syscon.c
+++ b/drivers/reset/reset-ti-syscon.c
@@ -56,6 +56,7 @@ struct ti_syscon_reset_data {
        struct regmap *regmap;
        struct ti_syscon_reset_control *controls;
        unsigned int nr_controls;
+       bool assert_deassert_together;
 };
 
 #define to_ti_syscon_reset_data(rcdev) \
@@ -158,10 +159,24 @@ static int ti_syscon_reset_status(struct 
reset_controller_dev *rcdev,
                !(control->flags & STATUS_SET);
 }
 
+static int ti_syscon_reset(struct reset_controller_dev *rcdev,
+                         unsigned long id)
+{
+       struct ti_syscon_reset_data *data = to_ti_syscon_reset_data(rcdev);
+
+       if (data->assert_deassert_together) {
+               ti_syscon_reset_assert(rcdev, id);
+               return ti_syscon_reset_deassert(rcdev, id);
+       } else {
+               return -ENOTSUPP;
+       }
+}
+
 static const struct reset_control_ops ti_syscon_reset_ops = {
        .assert         = ti_syscon_reset_assert,
        .deassert       = ti_syscon_reset_deassert,
        .status         = ti_syscon_reset_status,
+       .reset          = ti_syscon_reset,
 };
 
 static int ti_syscon_reset_probe(struct platform_device *pdev)
@@ -204,6 +219,11 @@ static int ti_syscon_reset_probe(struct platform_device 
*pdev)
                controls[i].flags = be32_to_cpup(list++);
        }
 
+       if (of_property_read_bool(np, "assert-deassert-together"))
+               data->assert_deassert_together = true;
+       else
+               data->assert_deassert_together = false;
+
        data->rcdev.ops = &ti_syscon_reset_ops;
        data->rcdev.owner = THIS_MODULE;
        data->rcdev.of_node = np;
-- 
2.18.0