linux-kernel - [PATCH 3/5] reset: imx8mp-audiomix: Introduce active

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Message-Id: <20250218085712.66690-4-daniel.baluta@nxp.com>
Date: Tue, 18 Feb 2025 10:57:10 +0200
From: Daniel Baluta <daniel.baluta@....com>
To: p.zabel@...gutronix.de,
	shawnguo@...nel.org,
	mathieu.poirier@...aro.org
Cc: s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	andersson@...nel.org,
	linux-remoteproc@...r.kernel.org,
	iuliana.prodan@....com,
	laurentiu.mihalcea@....com,
	shengjiu.wang@....com,
	Frank.Li@....com,
	krzk@...nel.org,
	Daniel Baluta <daniel.baluta@....com>
Subject: [PATCH 3/5] reset: imx8mp-audiomix: Introduce active_low configuration option

For EARC and EARC PHY the reset happens when clearing the reset bits.
Refactor assert/deassert function in order to take into account
the active_low configuratin option.

Signed-off-by: Daniel Baluta <daniel.baluta@....com>
---
 drivers/reset/reset-imx8mp-audiomix.c | 45 ++++++++++++++-------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
index 6b1666c4e069..8cc0a6b58cbc 100644
--- a/drivers/reset/reset-imx8mp-audiomix.c
+++ b/drivers/reset/reset-imx8mp-audiomix.c
@@ -23,16 +23,19 @@
 struct imx8mp_reset_map {
 	unsigned int offset;
 	unsigned int mask;
+	bool active_low;
 };
 
 static const struct imx8mp_reset_map reset_map[IMX8MP_AUDIOMIX_RESET_NUM] = {
 	[IMX8MP_AUDIOMIX_EARC] = {
 		.offset	= IMX8MP_AUDIOMIX_EARC_OFFSET,
 		.mask	= IMX8MP_AUDIOMIX_EARC_RESET_MASK,
+		.active_low = true,
 	},
 	[IMX8MP_AUDIOMIX_EARC_PHY] = {
 		.offset	= IMX8MP_AUDIOMIX_EARC_OFFSET,
 		.mask	= IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK,
+		.active_low = true,
 	},
 
 };
@@ -48,48 +51,46 @@ static struct imx8mp_audiomix_reset *to_imx8mp_audiomix_reset(struct reset_contr
 	return container_of(rcdev, struct imx8mp_audiomix_reset, rcdev);
 }
 
-static int imx8mp_audiomix_reset_assert(struct reset_controller_dev *rcdev,
-					unsigned long id)
+static int imx8mp_audiomix_update(struct reset_controller_dev *rcdev,
+				  unsigned long id, bool assert)
 {
 	struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
 	void __iomem *reg_addr = priv->base;
-	unsigned int mask, offset, reg;
-	unsigned long flags;
+	unsigned int mask, offset, active_low;
+	unsigned long reg, flags;
 
 	if (id >=  IMX8MP_AUDIOMIX_RESET_NUM)
 		return -EINVAL;
 
 	mask = reset_map[id].mask;
 	offset = reset_map[id].offset;
+	active_low = reset_map[id].active_low;
 
 	spin_lock_irqsave(&priv->lock, flags);
+
 	reg = readl(reg_addr + offset);
-	writel(reg & ~mask, reg_addr + offset);
+	if (active_low ^ assert)
+		reg |= mask;
+	else
+		reg &= ~mask;
+	writel(reg, reg_addr + offset);
+
 	spin_unlock_irqrestore(&priv->lock, flags);
 
 	return 0;
 }
 
+
+static int imx8mp_audiomix_reset_assert(struct reset_controller_dev *rcdev,
+					unsigned long id)
+{
+	return imx8mp_audiomix_update(rcdev, id, true);
+}
+
 static int imx8mp_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
 					  unsigned long id)
 {
-	struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
-	void __iomem *reg_addr = priv->base;
-	unsigned int mask, offset, reg;
-	unsigned long flags;
-
-	if (id >=  IMX8MP_AUDIOMIX_RESET_NUM)
-		return -EINVAL;
-
-	mask = reset_map[id].mask;
-	offset = reset_map[id].offset;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	reg = readl(reg_addr + offset);
-	writel(reg | mask, reg_addr + offset);
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	return 0;
+	return imx8mp_audiomix_update(rcdev, id, false);
 }
 
 static const struct reset_control_ops imx8mp_audiomix_reset_ops = {
-- 
2.25.1