linux-kernel - [PATCH v4 6/9] reset: amlogic: add reset status support

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Message-Id: <20240906-meson-rst-aux-v4-6-08824c3d108b@baylibre.com>
Date: Fri, 06 Sep 2024 15:34:51 +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>, 
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
 Jiucheng Xu <jiucheng.xu@...ogic.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH v4 6/9] reset: amlogic: add reset status support

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

This is done keep the functionality when the audio reset controller
get migrated to meson-reset.

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/reset/reset-meson.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index e31c1b7c9e4d..af690d3012ec 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -68,6 +68,22 @@ 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)
 {
@@ -84,6 +100,7 @@ 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 const struct meson_reset_param meson8b_param = {

-- 
2.45.2