linux-kernel - [PATCH 1/2] reset-controller: ti: adjust the reset assert and deassert interface

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Date:   Wed, 29 Jul 2020 15:39:16 +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>, <devicetree@...r.kernel.org>,
        <seiya.wang@...iatek.com>, Crystal Guo <crystal.guo@...iatek.com>
Subject: [PATCH 1/2] reset-controller: ti: adjust the reset assert and deassert interface

Add ti_syscon_reset() to integrate assert and deassert together,
and change return value of the reset assert and deassert interface
from regmap_update_bits to regmap_write_bits.

when clear bit is already 1, regmap_update_bits can not write 1 to it again.
Some IC has the feature that, when set bit is 1, the clear bit change
to 1 together. It will truly clear bit to 0 by write 1 to the clear bit

Signed-off-by: Crystal Guo <crystal.guo@...iatek.com>
---
 drivers/reset/reset-ti-syscon.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/reset/reset-ti-syscon.c b/drivers/reset/reset-ti-syscon.c
index a2635c2..5a8ec8f 100644
--- a/drivers/reset/reset-ti-syscon.c
+++ b/drivers/reset/reset-ti-syscon.c
@@ -89,7 +89,7 @@ static int ti_syscon_reset_assert(struct reset_controller_dev *rcdev,
 	mask = BIT(control->assert_bit);
 	value = (control->flags & ASSERT_SET) ? mask : 0x0;
 
-	return regmap_update_bits(data->regmap, control->assert_offset, mask, value);
+	return regmap_write_bits(data->regmap, control->assert_offset, mask, value);
 }
 
 /**
@@ -120,7 +120,7 @@ static int ti_syscon_reset_deassert(struct reset_controller_dev *rcdev,
 	mask = BIT(control->deassert_bit);
 	value = (control->flags & DEASSERT_SET) ? mask : 0x0;
 
-	return regmap_update_bits(data->regmap, control->deassert_offset, mask, value);
+	return regmap_write_bits(data->regmap, control->deassert_offset, mask, value);
 }
 
 /**
@@ -158,10 +158,19 @@ 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)
+{
+	ti_syscon_reset_assert(rcdev, id);
+
+	return ti_syscon_reset_deassert(rcdev, id);
+}
+
 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)
-- 
1.8.1.1.dirty