[PATCH v6 0/6] phy: fsl-imx8mq-usb: few improvements

[PATCH v6 0/6] phy: fsl-imx8mq-usb: few improvements

[Xu Yang]

Patch #1 fix Type-C switch resource leak if probe() fails.
Patch #3 add runtime PM support to avoid register access issue if the
      USB controller enters into runtime suspended state, in this state
      accessing USB PHY register may lack some resources. This will also
      avoid regulator leak if power_on() fails.
Patch #4 add debug control register regmap
Patch #5 add imx8mq_usb_phy_drvdata drvdata for better extension
Patch #6 correct i.MX8MP USB runtime wakeup issue after introduce runtime
      PM support.

---
Changes in v6:
- use devm_pm_runtime_enable() to disable runtime PM if probe fails 
- add imx8mq_usb_phy_drvdata drvdata and need_genpd_rpm_on flag for better extension
- Link to v5: https://patch.msgid.link/20260630-imx8mp-usb-phy-improvement-v5-0-25d616403844@nxp.com

Changes in v5:
- not use devm runtime callback to avoid clk enable/disable imblance
- Link to v4: https://patch.msgid.link/20260605-imx8mp-usb-phy-improvement-v4-0-b2ddf2f3862c@nxp.com

Changes in v4:
- add Rb tag
- replace guard() with PM_RUNTIME_ACQUIRE()
- Link to v3: https://patch.msgid.link/20260603-imx8mp-usb-phy-improvement-v3-0-7afb8f89abc6@nxp.com

Link to v2:
 - https://lore.kernel.org/linux-phy/20260512101046.1498096-1-xu.yang_2@nxp.com/
 - https://lore.kernel.org/linux-phy/20260512101212.1498223-1-xu.yang_2@nxp.com/

---
Felix Gu (1):
      phy: fsl-imx8mq-usb: fix typec switch leak on probe error path

Xu Yang (5):
      phy: fsl-imx8mq-usb: set usb phy to be wakeup capable
      phy: fsl-imx8mq-usb: add runtime PM support
      phy: fsl-imx8mq-usb: add control register regmap
      phy: fsl-imx8mq-usb: introduce per-variant driver data structure
      phy: fsl-imx8mq-usb: keep PHY power domain runtime always-on for i.MX8MP

 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 154 +++++++++++++++++++++--------
 1 file changed, 113 insertions(+), 41 deletions(-)
---
base-commit: cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5
change-id: 20260602-imx8mp-usb-phy-improvement-4272d308d862

Best regards,
--  
Xu Yang <xu.yang_2@nxp.com>

[PATCH v6 1/6] phy: fsl-imx8mq-usb: fix typec switch leak on probe error path

[Xu Yang]

From: Felix Gu <ustc.gu@gmail.com>

If probe fails after imx95_usb_phy_get_tca() succeeds, the typec
switch leaks because the only cleanup path was in .remove(), which
never runs on probe failure.

Use devm_add_action_or_reset() so the switch is cleaned up on both
probe failure and driver removal. The imx95_usb_phy_put_tca() is no
longer needed, it will be removed in .remove() too.

Fixes: b58f0f86fd61 ("phy: fsl-imx8mq-usb: add tca function driver for imx95")
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Xu Yang <xu.yang_2@nxp.com>
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v6:
 - delete .remove() is deleted words in commit message
Changes in v5:
 - keep remove() callback as patch #3 needs it
Changes in v4:
 - add my signed-off tag
Changes in v3:
 - add R-b tag
 - cc statble
 - drop "sw = data" conversion
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index b05d80e849a1..9a33c06d6fc3 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -173,9 +173,9 @@ static struct typec_switch_dev *tca_blk_get_typec_switch(struct platform_device
 	return sw;
 }
 
-static void tca_blk_put_typec_switch(struct typec_switch_dev *sw)
+static void tca_blk_put_typec_switch(void *data)
 {
-	typec_switch_unregister(sw);
+	typec_switch_unregister(data);
 }
 
 static void tca_blk_orientation_set(struct tca_blk *tca,
@@ -248,6 +248,7 @@ static struct tca_blk *imx95_usb_phy_get_tca(struct platform_device *pdev,
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	struct tca_blk *tca;
+	int ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	if (!res)
@@ -266,17 +267,11 @@ static struct tca_blk *imx95_usb_phy_get_tca(struct platform_device *pdev,
 	tca->orientation = TYPEC_ORIENTATION_NORMAL;
 	tca->sw = tca_blk_get_typec_switch(pdev, imx_phy);
 
-	return tca;
-}
-
-static void imx95_usb_phy_put_tca(struct imx8mq_usb_phy *imx_phy)
-{
-	struct tca_blk *tca = imx_phy->tca;
-
-	if (!tca)
-		return;
+	ret = devm_add_action_or_reset(&pdev->dev, tca_blk_put_typec_switch, tca->sw);
+	if (ret)
+		return ERR_PTR(ret);
 
-	tca_blk_put_typec_switch(tca->sw);
+	return tca;
 }
 
 static u32 phy_tx_vref_tune_from_property(u32 percent)
@@ -741,9 +736,7 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 
 static void imx8mq_usb_phy_remove(struct platform_device *pdev)
 {
-	struct imx8mq_usb_phy *imx_phy = platform_get_drvdata(pdev);
 
-	imx95_usb_phy_put_tca(imx_phy);
 }
 
 static struct platform_driver imx8mq_usb_phy_driver = {

-- 
2.34.1

[PATCH v6 2/6] phy: fsl-imx8mq-usb: set usb phy to be wakeup capable

[Xu Yang]

From: Xu Yang <xu.yang_2@nxp.com>

Set PHY wakeup capable because this PHY supports remote wakeup function.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v6:
 - no changes
Changes in v5:
 - no changes
Changes in v4:
 - add Rb tag
Changes in v3:
 - no changes
Changes in v2:
 - no changes
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index 9a33c06d6fc3..3a5788c609e1 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -728,6 +728,7 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 					"failed to get tca\n");
 
 	imx8m_get_phy_tuning_data(imx_phy);
+	device_set_wakeup_capable(dev, true);
 
 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 

-- 
2.34.1

[PATCH v6 3/6] phy: fsl-imx8mq-usb: add runtime PM support

[Xu Yang]

From: Xu Yang <xu.yang_2@nxp.com>

Add runtime PM to ensure the PHY is properly powered and clocked during
register access, preventing potential system hangs.

It guards register access in the following scenarios:
- PHY operations: init() and power_on/off() callbacks are guarded by
  phy core
- Type-C orientation switching when PHY/Controller are suspended which
  needs explicitly care
- Future PHY control port register regmap debugfs access

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v6:
 - use devm_pm_runtime_enable() to disable runtime PM when probe fails
 - simply pm_runtime_get_sync/disable/put_noidle() to pm_runtime_resume()
Changes in v5:
 - use non-devm PM runtime callback to correctly enable/disable clocks
   when unbind the device
Changes in v4:
 - replace guard() with PM_RUNTIME_ACQUIRE()
Changes in v3:
 - new patch
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 67 +++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 19 deletions(-)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index 3a5788c609e1..bc804d2b5aee 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -9,6 +9,7 @@
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/usb/typec_mux.h>
 
@@ -136,17 +137,15 @@ static int tca_blk_typec_switch_set(struct typec_switch_dev *sw,
 {
 	struct imx8mq_usb_phy *imx_phy = typec_switch_get_drvdata(sw);
 	struct tca_blk *tca = imx_phy->tca;
-	int ret;
 
 	if (tca->orientation == orientation)
 		return 0;
 
-	ret = clk_prepare_enable(imx_phy->clk);
-	if (ret)
-		return ret;
+	PM_RUNTIME_ACQUIRE(&imx_phy->phy->dev, pm);
+	if (PM_RUNTIME_ACQUIRE_ERR(&pm))
+		return -ENXIO;
 
 	tca_blk_orientation_set(tca, orientation);
-	clk_disable_unprepare(imx_phy->clk);
 
 	return 0;
 }
@@ -620,16 +619,6 @@ static int imx8mq_phy_power_on(struct phy *phy)
 	if (ret)
 		return ret;
 
-	ret = clk_prepare_enable(imx_phy->clk);
-	if (ret)
-		return ret;
-
-	ret = clk_prepare_enable(imx_phy->alt_clk);
-	if (ret) {
-		clk_disable_unprepare(imx_phy->clk);
-		return ret;
-	}
-
 	/* Disable rx term override */
 	value = readl(imx_phy->base + PHY_CTRL6);
 	value &= ~PHY_CTRL6_RXTERM_OVERRIDE_SEL;
@@ -648,8 +637,6 @@ static int imx8mq_phy_power_off(struct phy *phy)
 	value |= PHY_CTRL6_RXTERM_OVERRIDE_SEL;
 	writel(value, imx_phy->base + PHY_CTRL6);
 
-	clk_disable_unprepare(imx_phy->alt_clk);
-	clk_disable_unprepare(imx_phy->clk);
 	regulator_disable(imx_phy->vbus);
 
 	return 0;
@@ -686,6 +673,7 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct imx8mq_usb_phy *imx_phy;
 	const struct phy_ops *phy_ops;
+	int ret;
 
 	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
 	if (!imx_phy)
@@ -693,13 +681,13 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, imx_phy);
 
-	imx_phy->clk = devm_clk_get(dev, "phy");
+	imx_phy->clk = devm_clk_get_enabled(dev, "phy");
 	if (IS_ERR(imx_phy->clk)) {
 		dev_err(dev, "failed to get imx8mq usb phy clock\n");
 		return PTR_ERR(imx_phy->clk);
 	}
 
-	imx_phy->alt_clk = devm_clk_get_optional(dev, "alt");
+	imx_phy->alt_clk = devm_clk_get_optional_enabled(dev, "alt");
 	if (IS_ERR(imx_phy->alt_clk))
 		return dev_err_probe(dev, PTR_ERR(imx_phy->alt_clk),
 				    "Failed to get alt clk\n");
@@ -708,6 +696,11 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	if (IS_ERR(imx_phy->base))
 		return PTR_ERR(imx_phy->base);
 
+	pm_runtime_set_active(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable runtime PM\n");
+
 	phy_ops = of_device_get_match_data(dev);
 	if (!phy_ops)
 		return -EINVAL;
@@ -737,15 +730,51 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 
 static void imx8mq_usb_phy_remove(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
+
+	/* To allow devm-managed resources to be released cleanly */
+	if (pm_runtime_suspended(dev))
+		pm_runtime_resume(dev);
+}
+
+static int imx8mq_usb_phy_runtime_suspend(struct device *dev)
+{
+	struct imx8mq_usb_phy *imx_phy = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(imx_phy->alt_clk);
+	clk_disable_unprepare(imx_phy->clk);
 
+	return 0;
 }
 
+static int imx8mq_usb_phy_runtime_resume(struct device *dev)
+{
+	struct imx8mq_usb_phy *imx_phy = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(imx_phy->clk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(imx_phy->alt_clk);
+	if (ret) {
+		clk_disable_unprepare(imx_phy->clk);
+		return ret;
+	}
+
+	return 0;
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(imx8mq_usb_phy_pm_ops, imx8mq_usb_phy_runtime_suspend,
+				 imx8mq_usb_phy_runtime_resume, NULL);
+
 static struct platform_driver imx8mq_usb_phy_driver = {
 	.probe	= imx8mq_usb_phy_probe,
 	.remove = imx8mq_usb_phy_remove,
 	.driver = {
 		.name	= "imx8mq-usb-phy",
 		.of_match_table	= imx8mq_usb_phy_of_match,
+		.pm = pm_ptr(&imx8mq_usb_phy_pm_ops),
 		.suppress_bind_attrs = true,
 	}
 };

-- 
2.34.1

Re: [PATCH v6 3/6] phy: fsl-imx8mq-usb: add runtime PM support

[Frank Li]

On Wed, Jul 15, 2026 at 07:33:58PM +0800, Xu Yang wrote:
> From: Xu Yang <xu.yang_2@nxp.com>
>
> Add runtime PM to ensure the PHY is properly powered and clocked during
> register access, preventing potential system hangs.
>
> It guards register access in the following scenarios:
> - PHY operations: init() and power_on/off() callbacks are guarded by
>   phy core
> - Type-C orientation switching when PHY/Controller are suspended which
>   needs explicitly care
> - Future PHY control port register regmap debugfs access
>
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
>
> ---
> Changes in v6:
>  - use devm_pm_runtime_enable() to disable runtime PM when probe fails
>  - simply pm_runtime_get_sync/disable/put_noidle() to pm_runtime_resume()
> Changes in v5:
>  - use non-devm PM runtime callback to correctly enable/disable clocks
>    when unbind the device
> Changes in v4:
>  - replace guard() with PM_RUNTIME_ACQUIRE()
> Changes in v3:
>  - new patch
> ---
>  drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 67 +++++++++++++++++++++---------
>  1 file changed, 48 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> index 3a5788c609e1..bc804d2b5aee 100644
> --- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> +++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> @@ -9,6 +9,7 @@
>  #include <linux/of.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/usb/typec_mux.h>
>
> @@ -136,17 +137,15 @@ static int tca_blk_typec_switch_set(struct typec_switch_dev *sw,
>  {
>  	struct imx8mq_usb_phy *imx_phy = typec_switch_get_drvdata(sw);
>  	struct tca_blk *tca = imx_phy->tca;
> -	int ret;
>
>  	if (tca->orientation == orientation)
>  		return 0;
>
> -	ret = clk_prepare_enable(imx_phy->clk);
> -	if (ret)
> -		return ret;
> +	PM_RUNTIME_ACQUIRE(&imx_phy->phy->dev, pm);
> +	if (PM_RUNTIME_ACQUIRE_ERR(&pm))
> +		return -ENXIO;
>
>  	tca_blk_orientation_set(tca, orientation);
> -	clk_disable_unprepare(imx_phy->clk);
>
>  	return 0;
>  }
> @@ -620,16 +619,6 @@ static int imx8mq_phy_power_on(struct phy *phy)
>  	if (ret)
>  		return ret;
>
> -	ret = clk_prepare_enable(imx_phy->clk);
> -	if (ret)
> -		return ret;
> -
> -	ret = clk_prepare_enable(imx_phy->alt_clk);
> -	if (ret) {
> -		clk_disable_unprepare(imx_phy->clk);
> -		return ret;
> -	}
> -
>  	/* Disable rx term override */
>  	value = readl(imx_phy->base + PHY_CTRL6);
>  	value &= ~PHY_CTRL6_RXTERM_OVERRIDE_SEL;
> @@ -648,8 +637,6 @@ static int imx8mq_phy_power_off(struct phy *phy)
>  	value |= PHY_CTRL6_RXTERM_OVERRIDE_SEL;
>  	writel(value, imx_phy->base + PHY_CTRL6);
>
> -	clk_disable_unprepare(imx_phy->alt_clk);
> -	clk_disable_unprepare(imx_phy->clk);
>  	regulator_disable(imx_phy->vbus);
>
>  	return 0;
> @@ -686,6 +673,7 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct imx8mq_usb_phy *imx_phy;
>  	const struct phy_ops *phy_ops;
> +	int ret;
>
>  	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
>  	if (!imx_phy)
> @@ -693,13 +681,13 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>
>  	platform_set_drvdata(pdev, imx_phy);
>
> -	imx_phy->clk = devm_clk_get(dev, "phy");
> +	imx_phy->clk = devm_clk_get_enabled(dev, "phy");
>  	if (IS_ERR(imx_phy->clk)) {
>  		dev_err(dev, "failed to get imx8mq usb phy clock\n");
>  		return PTR_ERR(imx_phy->clk);
>  	}
>
> -	imx_phy->alt_clk = devm_clk_get_optional(dev, "alt");
> +	imx_phy->alt_clk = devm_clk_get_optional_enabled(dev, "alt");
>  	if (IS_ERR(imx_phy->alt_clk))
>  		return dev_err_probe(dev, PTR_ERR(imx_phy->alt_clk),
>  				    "Failed to get alt clk\n");
> @@ -708,6 +696,11 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>  	if (IS_ERR(imx_phy->base))
>  		return PTR_ERR(imx_phy->base);
>
> +	pm_runtime_set_active(dev);
> +	ret = devm_pm_runtime_enable(dev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to enable runtime PM\n");
> +

no place to call pm runtime suspend, so whole driver's life cycle runtime
pm is on, is it expected?

Frank

>  	phy_ops = of_device_get_match_data(dev);
>  	if (!phy_ops)
>  		return -EINVAL;
> @@ -737,15 +730,51 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>
>  static void imx8mq_usb_phy_remove(struct platform_device *pdev)
>  {
> +	struct device *dev = &pdev->dev;
> +
> +	/* To allow devm-managed resources to be released cleanly */
> +	if (pm_runtime_suspended(dev))
> +		pm_runtime_resume(dev);
> +}
> +
> +static int imx8mq_usb_phy_runtime_suspend(struct device *dev)
> +{
> +	struct imx8mq_usb_phy *imx_phy = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(imx_phy->alt_clk);
> +	clk_disable_unprepare(imx_phy->clk);
>
> +	return 0;
>  }
>
> +static int imx8mq_usb_phy_runtime_resume(struct device *dev)
> +{
> +	struct imx8mq_usb_phy *imx_phy = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(imx_phy->clk);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(imx_phy->alt_clk);
> +	if (ret) {
> +		clk_disable_unprepare(imx_phy->clk);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static DEFINE_RUNTIME_DEV_PM_OPS(imx8mq_usb_phy_pm_ops, imx8mq_usb_phy_runtime_suspend,
> +				 imx8mq_usb_phy_runtime_resume, NULL);
> +
>  static struct platform_driver imx8mq_usb_phy_driver = {
>  	.probe	= imx8mq_usb_phy_probe,
>  	.remove = imx8mq_usb_phy_remove,
>  	.driver = {
>  		.name	= "imx8mq-usb-phy",
>  		.of_match_table	= imx8mq_usb_phy_of_match,
> +		.pm = pm_ptr(&imx8mq_usb_phy_pm_ops),
>  		.suppress_bind_attrs = true,
>  	}
>  };
>
> --
> 2.34.1
>
>

[PATCH v6 4/6] phy: fsl-imx8mq-usb: add control register regmap

[Xu Yang]

From: Xu Yang <xu.yang_2@nxp.com>

The CR port is a simple 16-bit data/address parallel port that is
accessed through 32-bit MMIO registers for on-chip access to the
control registers inside the USB 3.0 femtoPHY. Add control register
regmap and export these registers by debugfs to help PHY's diagnostic.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v6:
 - no changes
Changes in v5:
 - add Rb tag
Changes in v4:
 - improve commit message as Haibo's suggestion
Changes in v3:
 - drop Frank's tag because it includes other changes
 - new patch
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index bc804d2b5aee..79b3958ead2f 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0+
-/* Copyright (c) 2017 NXP. */
+/* Copyright 2017-2026 NXP. */
 
 #include <linux/bitfield.h>
 #include <linux/clk.h>
@@ -11,6 +11,7 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
 #include <linux/usb/typec_mux.h>
 
 #define PHY_CTRL0			0x0
@@ -56,6 +57,8 @@
 #define PHY_CTRL6_ALT_CLK_EN		BIT(1)
 #define PHY_CTRL6_ALT_CLK_SEL		BIT(0)
 
+#define PHY_CRCTL			0x30
+
 #define PHY_TUNE_DEFAULT		0xffffffff
 
 #define TCA_CLK_RST			0x00
@@ -119,6 +122,7 @@ struct imx8mq_usb_phy {
 	void __iomem *base;
 	struct regulator *vbus;
 	struct tca_blk *tca;
+	struct regmap *cr_regmap;
 	u32 pcs_tx_swing_full;
 	u32 pcs_tx_deemph_3p5db;
 	u32 tx_vref_tune;
@@ -667,6 +671,14 @@ static const struct of_device_id imx8mq_usb_phy_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
 
+static const struct regmap_config imx_cr_regmap_config = {
+	.name = "cr",
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = 0x7,
+};
+
 static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 {
 	struct phy_provider *phy_provider;
@@ -696,6 +708,13 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	if (IS_ERR(imx_phy->base))
 		return PTR_ERR(imx_phy->base);
 
+	imx_phy->cr_regmap = devm_regmap_init_mmio(dev, imx_phy->base + PHY_CRCTL,
+						   &imx_cr_regmap_config);
+	if (IS_ERR(imx_phy->cr_regmap)) {
+		dev_warn(dev, "Fail to init debug register regmap\n");
+		imx_phy->cr_regmap = NULL;
+	}
+
 	pm_runtime_set_active(dev);
 	ret = devm_pm_runtime_enable(dev);
 	if (ret)
@@ -741,6 +760,9 @@ static int imx8mq_usb_phy_runtime_suspend(struct device *dev)
 {
 	struct imx8mq_usb_phy *imx_phy = dev_get_drvdata(dev);
 
+	if (imx_phy->cr_regmap)
+		regcache_cache_only(imx_phy->cr_regmap, true);
+
 	clk_disable_unprepare(imx_phy->alt_clk);
 	clk_disable_unprepare(imx_phy->clk);
 
@@ -762,6 +784,9 @@ static int imx8mq_usb_phy_runtime_resume(struct device *dev)
 		return ret;
 	}
 
+	if (imx_phy->cr_regmap)
+		regcache_cache_only(imx_phy->cr_regmap, false);
+
 	return 0;
 }
 

-- 
2.34.1

[PATCH v6 5/6] phy: fsl-imx8mq-usb: introduce per-variant driver data structure

[Xu Yang]

From: Xu Yang <xu.yang_2@nxp.com>

Replace direct use of phy_ops pointer in of_device_id .data with a
dedicated imx8mq_usb_phy_drvdata structure. This allows per-variant
driver data to be extended in the future without changing the match
table.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v6:
 - new patch
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index 79b3958ead2f..f0bdfa75d586 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -132,6 +132,9 @@ struct imx8mq_usb_phy {
 	u32 comp_dis_tune;
 };
 
+struct imx8mq_usb_phy_drvdata {
+	const struct phy_ops *ops;
+};
 
 static void tca_blk_orientation_set(struct tca_blk *tca,
 				enum typec_orientation orientation);
@@ -660,13 +663,25 @@ static const struct phy_ops imx8mp_usb_phy_ops = {
 	.owner		= THIS_MODULE,
 };
 
+static const struct imx8mq_usb_phy_drvdata imx8mq_usb_phy_data = {
+	.ops = &imx8mq_usb_phy_ops,
+};
+
+static const struct imx8mq_usb_phy_drvdata imx8mp_usb_phy_data = {
+	.ops = &imx8mp_usb_phy_ops,
+};
+
+static const struct imx8mq_usb_phy_drvdata imx95_usb_phy_data = {
+	.ops = &imx8mp_usb_phy_ops,
+};
+
 static const struct of_device_id imx8mq_usb_phy_of_match[] = {
 	{.compatible = "fsl,imx8mq-usb-phy",
-	 .data = &imx8mq_usb_phy_ops,},
+	 .data = &imx8mq_usb_phy_data,},
 	{.compatible = "fsl,imx8mp-usb-phy",
-	 .data = &imx8mp_usb_phy_ops,},
+	 .data = &imx8mp_usb_phy_data,},
 	{.compatible = "fsl,imx95-usb-phy",
-	 .data = &imx8mp_usb_phy_ops,},
+	 .data = &imx95_usb_phy_data,},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
@@ -684,7 +699,7 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	struct phy_provider *phy_provider;
 	struct device *dev = &pdev->dev;
 	struct imx8mq_usb_phy *imx_phy;
-	const struct phy_ops *phy_ops;
+	const struct imx8mq_usb_phy_drvdata *phy_data;
 	int ret;
 
 	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
@@ -720,11 +735,11 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to enable runtime PM\n");
 
-	phy_ops = of_device_get_match_data(dev);
-	if (!phy_ops)
+	phy_data = of_device_get_match_data(dev);
+	if (!phy_data)
 		return -EINVAL;
 
-	imx_phy->phy = devm_phy_create(dev, NULL, phy_ops);
+	imx_phy->phy = devm_phy_create(dev, NULL, phy_data->ops);
 	if (IS_ERR(imx_phy->phy))
 		return PTR_ERR(imx_phy->phy);
 

-- 
2.34.1

Re: [PATCH v6 5/6] phy: fsl-imx8mq-usb: introduce per-variant driver data structure

[Frank Li]

On Wed, Jul 15, 2026 at 07:34:00PM +0800, Xu Yang wrote:
> From: Xu Yang <xu.yang_2@nxp.com>
>
> Replace direct use of phy_ops pointer in of_device_id .data with a
> dedicated imx8mq_usb_phy_drvdata structure. This allows per-variant
> driver data to be extended in the future without changing the match
> table.
>
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>
> ---
> Changes in v6:
>  - new patch
> ---
>  drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 29 ++++++++++++++++++++++-------
>  1 file changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> index 79b3958ead2f..f0bdfa75d586 100644
> --- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> +++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> @@ -132,6 +132,9 @@ struct imx8mq_usb_phy {
>  	u32 comp_dis_tune;
>  };
>
> +struct imx8mq_usb_phy_drvdata {
> +	const struct phy_ops *ops;
> +};
>
>  static void tca_blk_orientation_set(struct tca_blk *tca,
>  				enum typec_orientation orientation);
> @@ -660,13 +663,25 @@ static const struct phy_ops imx8mp_usb_phy_ops = {
>  	.owner		= THIS_MODULE,
>  };
>
> +static const struct imx8mq_usb_phy_drvdata imx8mq_usb_phy_data = {
> +	.ops = &imx8mq_usb_phy_ops,
> +};
> +
> +static const struct imx8mq_usb_phy_drvdata imx8mp_usb_phy_data = {
> +	.ops = &imx8mp_usb_phy_ops,
> +};
> +
> +static const struct imx8mq_usb_phy_drvdata imx95_usb_phy_data = {
> +	.ops = &imx8mp_usb_phy_ops,
> +};
> +
>  static const struct of_device_id imx8mq_usb_phy_of_match[] = {
>  	{.compatible = "fsl,imx8mq-usb-phy",
> -	 .data = &imx8mq_usb_phy_ops,},
> +	 .data = &imx8mq_usb_phy_data,},
>  	{.compatible = "fsl,imx8mp-usb-phy",
> -	 .data = &imx8mp_usb_phy_ops,},
> +	 .data = &imx8mp_usb_phy_data,},
>  	{.compatible = "fsl,imx95-usb-phy",
> -	 .data = &imx8mp_usb_phy_ops,},
> +	 .data = &imx95_usb_phy_data,},
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
> @@ -684,7 +699,7 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>  	struct phy_provider *phy_provider;
>  	struct device *dev = &pdev->dev;
>  	struct imx8mq_usb_phy *imx_phy;
> -	const struct phy_ops *phy_ops;
> +	const struct imx8mq_usb_phy_drvdata *phy_data;
>  	int ret;
>
>  	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
> @@ -720,11 +735,11 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>  	if (ret)
>  		return dev_err_probe(dev, ret, "failed to enable runtime PM\n");
>
> -	phy_ops = of_device_get_match_data(dev);
> -	if (!phy_ops)
> +	phy_data = of_device_get_match_data(dev);
> +	if (!phy_data)
>  		return -EINVAL;
>
> -	imx_phy->phy = devm_phy_create(dev, NULL, phy_ops);
> +	imx_phy->phy = devm_phy_create(dev, NULL, phy_data->ops);
>  	if (IS_ERR(imx_phy->phy))
>  		return PTR_ERR(imx_phy->phy);
>
>
> --
> 2.34.1
>
>

[PATCH v6 6/6] phy: fsl-imx8mq-usb: keep PHY power domain runtime always-on for i.MX8MP

[Xu Yang]

From: Xu Yang <xu.yang_2@nxp.com>

On i.MX8MP, the USB PHY has a dedicated power domain that was previously
never powered off at runtime. With the introduction of runtime PM support,
the power domain will be powered off if the device is runtime suspended,
which breaks USB wakeup functionality.

To preserve wakeup functionality, mark the PHY power domain as runtime
always-on for i.MX8MP platform. To limit the behavior to i.MX8MP, add a
need_genpd_rpm_on to imx8mq_usb_phy_drvdata and set it as true for i.MX8MP.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v6:
 - set need_genpd_rpm_on flag for i.MX8MP and call dev_pm_genpd_rpm_always_on()
   if the flag is true
Changes in v5:
 - no changes
Changes in v4:
 - no changes
Changes in v3:
 - new patch
---
 drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
index f0bdfa75d586..2398bda50eb8 100644
--- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -9,6 +9,7 @@
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/regmap.h>
@@ -134,6 +135,7 @@ struct imx8mq_usb_phy {
 
 struct imx8mq_usb_phy_drvdata {
 	const struct phy_ops *ops;
+	bool need_genpd_rpm_on;
 };
 
 static void tca_blk_orientation_set(struct tca_blk *tca,
@@ -669,6 +671,7 @@ static const struct imx8mq_usb_phy_drvdata imx8mq_usb_phy_data = {
 
 static const struct imx8mq_usb_phy_drvdata imx8mp_usb_phy_data = {
 	.ops = &imx8mp_usb_phy_ops,
+	.need_genpd_rpm_on = true,
 };
 
 static const struct imx8mq_usb_phy_drvdata imx95_usb_phy_data = {
@@ -739,6 +742,12 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
 	if (!phy_data)
 		return -EINVAL;
 
+	if (phy_data->need_genpd_rpm_on) {
+		ret = dev_pm_genpd_rpm_always_on(dev, true);
+		if (ret)
+			return dev_err_probe(dev, ret, "failed to set genpd rpm always on\n");
+	}
+
 	imx_phy->phy = devm_phy_create(dev, NULL, phy_data->ops);
 	if (IS_ERR(imx_phy->phy))
 		return PTR_ERR(imx_phy->phy);

-- 
2.34.1

Re: [PATCH v6 6/6] phy: fsl-imx8mq-usb: keep PHY power domain runtime always-on for i.MX8MP

[Frank Li]

On Wed, Jul 15, 2026 at 07:34:01PM +0800, Xu Yang wrote:
> From: Xu Yang <xu.yang_2@nxp.com>
>
> On i.MX8MP, the USB PHY has a dedicated power domain that was previously
> never powered off at runtime. With the introduction of runtime PM support,
> the power domain will be powered off if the device is runtime suspended,
> which breaks USB wakeup functionality.
>
> To preserve wakeup functionality, mark the PHY power domain as runtime
> always-on for i.MX8MP platform. To limit the behavior to i.MX8MP, add a
> need_genpd_rpm_on to imx8mq_usb_phy_drvdata and set it as true for i.MX8MP.
>
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
>
> ---
> Changes in v6:
>  - set need_genpd_rpm_on flag for i.MX8MP and call dev_pm_genpd_rpm_always_on()
>    if the flag is true
> Changes in v5:
>  - no changes
> Changes in v4:
>  - no changes
> Changes in v3:
>  - new patch
> ---
>  drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> index f0bdfa75d586..2398bda50eb8 100644
> --- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> +++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
> @@ -9,6 +9,7 @@
>  #include <linux/of.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/regmap.h>
> @@ -134,6 +135,7 @@ struct imx8mq_usb_phy {
>
>  struct imx8mq_usb_phy_drvdata {
>  	const struct phy_ops *ops;
> +	bool need_genpd_rpm_on;
>  };
>
>  static void tca_blk_orientation_set(struct tca_blk *tca,
> @@ -669,6 +671,7 @@ static const struct imx8mq_usb_phy_drvdata imx8mq_usb_phy_data = {
>
>  static const struct imx8mq_usb_phy_drvdata imx8mp_usb_phy_data = {
>  	.ops = &imx8mp_usb_phy_ops,
> +	.need_genpd_rpm_on = true,
>  };
>
>  static const struct imx8mq_usb_phy_drvdata imx95_usb_phy_data = {
> @@ -739,6 +742,12 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
>  	if (!phy_data)
>  		return -EINVAL;
>
> +	if (phy_data->need_genpd_rpm_on) {
> +		ret = dev_pm_genpd_rpm_always_on(dev, true);
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to set genpd rpm always on\n");
> +	}
> +

need set false at driver remove?

Frank

>  	imx_phy->phy = devm_phy_create(dev, NULL, phy_data->ops);
>  	if (IS_ERR(imx_phy->phy))
>  		return PTR_ERR(imx_phy->phy);
>
> --
> 2.34.1
>
>