linux-kernel - [RFC PATCH 5/9] reset: amlogic: add reset status support

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Date: Thu, 16 May 2024 17:08:35 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
	Stephen Boyd <sboyd@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>
Cc: Jerome Brunet <jbrunet@...libre.com>,
	Jan Dakinevich <jan.dakinevich@...utedevices.com>,
	linux-kernel@...r.kernel.org,
	linux-amlogic@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: [RFC PATCH 5/9] reset: amlogic: add reset status support

Add the callback to check the status of the level reset, as done in
the reset driver of the audio clock controller.

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/reset/reset-meson.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index 3e0447366ba6..65ba9190cb53 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -69,6 +69,23 @@ static int meson_reset_level(struct reset_controller_dev *rcdev,
 				  BIT(bit), assert ? BIT(bit) : 0);
 }
 
+static int meson_reset_status(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct meson_reset *data =
+		container_of(rcdev, struct meson_reset, rcdev);
+	unsigned int val, offset, bit;
+
+	meson_reset_offset_and_bit(data, id, &offset, &bit);
+	offset += data->param->level_offset;
+
+	regmap_read(data->map, offset, &val);
+	val = !!(BIT(bit) & val);
+
+
+	return val ^ data->param->level_low_reset;
+}
+
 static int meson_reset_assert(struct reset_controller_dev *rcdev,
 			      unsigned long id)
 {
@@ -85,6 +102,7 @@ static const struct reset_control_ops meson_reset_ops = {
 	.reset		= meson_reset_reset,
 	.assert		= meson_reset_assert,
 	.deassert	= meson_reset_deassert,
+	.status		= meson_reset_status,
 };
 
 static int meson_reset_probe(struct device *dev, struct regmap *map,
-- 
2.43.0