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

Crystal Guo
2020-08-03T06:17:27Z

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