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

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Date:   Mon, 3 Aug 2020 14:15:09 +0800
From:   Crystal Guo <crystal.guo@...iatek.com>
To:     <p.zabel@...gutronix.de>, <robh+dt@...nel.org>,
        <matthias.bgg@...il.com>
CC:     <srv_heupstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <seiya.wang@...iatek.com>,
        <stanley.chu@...iatek.com>, <yingjoe.chen@...iatek.com>,
        <fan.chen@...iatek.com>, <yong.liang@...iatek.com>,
        Crystal Guo <crystal.guo@...iatek.com>
Subject: [v2,4/6] reset-controller: ti: introduce a new reset handler

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