linux-kernel - [RFC PATCH 2/9] reset: amlogic: add driver parameters

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Date: Thu, 16 May 2024 17:08:32 +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 2/9] reset: amlogic: add driver parameters

To allow using the same driver for the main reset controller and the
auxiliary ones embedded in the clock controllers, allow to customise
the reset offset, same as the level offset. Also add an option to make
the level reset active low or high.

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/reset/reset-meson.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
index 8f3d6e9df235..59126c9f194a 100644
--- a/drivers/reset/reset-meson.c
+++ b/drivers/reset/reset-meson.c
@@ -18,7 +18,9 @@
 
 struct meson_reset_param {
 	int reg_count;
+	int reset_offset;
 	int level_offset;
+	bool level_low_reset;
 };
 
 struct meson_reset {
@@ -46,6 +48,7 @@ static int meson_reset_reset(struct reset_controller_dev *rcdev,
 	unsigned int offset, bit;
 
 	meson_reset_offset_and_bit(data, id, &offset, &bit);
+	offset += data->param->reset_offset;
 
 	return regmap_update_bits(data->map, offset,
 				  BIT(bit), BIT(bit));
@@ -60,9 +63,10 @@ static int meson_reset_level(struct reset_controller_dev *rcdev,
 
 	meson_reset_offset_and_bit(data, id, &offset, &bit);
 	offset += data->param->level_offset;
+	assert ^= data->param->level_low_reset;
 
 	return regmap_update_bits(data->map, offset,
-				  BIT(bit), assert ? 0 : BIT(bit));
+				  BIT(bit), assert ? BIT(bit) : 0);
 }
 
 static int meson_reset_assert(struct reset_controller_dev *rcdev,
@@ -85,17 +89,23 @@ static const struct reset_control_ops meson_reset_ops = {
 
 static const struct meson_reset_param meson8b_param = {
 	.reg_count	= 8,
+	.reset_offset	= 0x0,
 	.level_offset	= 0x7c,
+	.level_low_reset = true,
 };
 
 static const struct meson_reset_param meson_a1_param = {
 	.reg_count	= 3,
+	.reset_offset	= 0x0,
 	.level_offset	= 0x40,
+	.level_low_reset = true,
 };
 
 static const struct meson_reset_param meson_s4_param = {
 	.reg_count	= 6,
+	.reset_offset	= 0x0,
 	.level_offset	= 0x40,
+	.level_low_reset = true,
 };
 
 static const struct of_device_id meson_reset_dt_ids[] = {
-- 
2.43.0