[PATCH v2 0/3] i.MX91/93 BLK-CTRL improvements

[PATCH v2 0/3] i.MX91/93 BLK-CTRL improvements

[Marco Felsch]

Hi,

there were several approaches to bring the sub-devices population
mainline [1,2] but non of them made it upstream. Both approaches were
part of either the i.MX93 LVDS or MIPI-CSI enablement.

This small patchset decouples the blk-ctrl changes which allows the
MIPI-CSI and LVDS patchstack to be rebased ontop of this patchset.

Before adding the sub-device supprt, I converted the driver to devm_*
only API.

Regards,
  Marco

[1] https://lore.kernel.org/all/20250701-95_cam-v1-3-c5172bab387b@nxp.com/
[2] https://lore.kernel.org/all/20250304154929.1785200-4-alexander.stein@ew.tq-group.com/

---
Changes in v2:
- Link to v1: https://lore.kernel.org/r/20251201-v6-18-topic-imx93-blkctrl-v1-0-b57a72e60105@pengutronix.de
- Adapt patch2 commit message (Frank)
- Check devm_pm_runtime_enable() return (Frank)
- Add r-b tags (Frank, Alexander)

---
Marco Felsch (3):
      pmdomain: imx93-blk-ctrl: cleanup error path
      pmdomain: imx93-blk-ctrl: convert to devm_* only
      pmdomain: imx93-blk-ctrl: add support for optional subnodes

 drivers/pmdomain/imx/imx93-blk-ctrl.c | 77 ++++++++++++++++-------------------
 1 file changed, 36 insertions(+), 41 deletions(-)
---
base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
change-id: 20251201-v6-18-topic-imx93-blkctrl-341220f7084d

Best regards,
-- 
Marco Felsch <m.felsch@pengutronix.de>

[PATCH v2 1/3] pmdomain: imx93-blk-ctrl: cleanup error path

[Marco Felsch]

Call dev_err_probe() directly during return to make the code more
compact.

Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/pmdomain/imx/imx93-blk-ctrl.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/pmdomain/imx/imx93-blk-ctrl.c b/drivers/pmdomain/imx/imx93-blk-ctrl.c
index e094fe5a42bf646c712f3eca4e66a313fa5a914c..2aa163aef8de4ee901b9cde76ce2aad246c8c08a 100644
--- a/drivers/pmdomain/imx/imx93-blk-ctrl.c
+++ b/drivers/pmdomain/imx/imx93-blk-ctrl.c
@@ -240,10 +240,8 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
 	bc->num_clks = bc_data->num_clks;
 
 	ret = devm_clk_bulk_get(dev, bc->num_clks, bc->clks);
-	if (ret) {
-		dev_err_probe(dev, ret, "failed to get bus clock\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get bus clock\n");
 
 	for (i = 0; i < bc_data->num_domains; i++) {
 		const struct imx93_blk_ctrl_domain_data *data = &bc_data->domains[i];

-- 
2.47.3

[PATCH v2 2/3] pmdomain: imx93-blk-ctrl: convert to devm_* only

[Marco Felsch]

Convert the driver to devm_ APIs only by making use of
devm_add_action_or_reset() and devm_pm_runtime_enable() to simplify the
probe error path and to drop the .remove() callback. This also ensures
that the device release order equals the device probe error path order.

Furthermore drop the dev_set_drvdata() usage since the only user was the
.remove() callback which is removed by this commit.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/pmdomain/imx/imx93-blk-ctrl.c | 66 +++++++++++++++--------------------
 1 file changed, 29 insertions(+), 37 deletions(-)

diff --git a/drivers/pmdomain/imx/imx93-blk-ctrl.c b/drivers/pmdomain/imx/imx93-blk-ctrl.c
index 2aa163aef8de4ee901b9cde76ce2aad246c8c08a..49610f2389c3bbaf4de4133918fbcacb7924f672 100644
--- a/drivers/pmdomain/imx/imx93-blk-ctrl.c
+++ b/drivers/pmdomain/imx/imx93-blk-ctrl.c
@@ -188,6 +188,20 @@ static int imx93_blk_ctrl_power_off(struct generic_pm_domain *genpd)
 	return 0;
 }
 
+static void imx93_release_genpd_provider(void *data)
+{
+	struct device_node *of_node = data;
+
+	of_genpd_del_provider(of_node);
+}
+
+static void imx93_release_pm_genpd(void *data)
+{
+	struct generic_pm_domain *genpd = data;
+
+	pm_genpd_remove(genpd);
+}
+
 static struct lock_class_key blk_ctrl_genpd_lock_class;
 
 static int imx93_blk_ctrl_probe(struct platform_device *pdev)
@@ -256,10 +270,8 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
 			domain->clks[j].id = data->clk_names[j];
 
 		ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks);
-		if (ret) {
-			dev_err_probe(dev, ret, "failed to get clock\n");
-			goto cleanup_pds;
-		}
+		if (ret)
+			return dev_err_probe(dev, ret, "failed to get clock\n");
 
 		domain->genpd.name = data->name;
 		domain->genpd.power_on = imx93_blk_ctrl_power_on;
@@ -267,11 +279,12 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
 		domain->bc = bc;
 
 		ret = pm_genpd_init(&domain->genpd, NULL, true);
-		if (ret) {
-			dev_err_probe(dev, ret, "failed to init power domain\n");
-			goto cleanup_pds;
-		}
+		if (ret)
+			return dev_err_probe(dev, ret, "failed to init power domain\n");
 
+		ret = devm_add_action_or_reset(dev, imx93_release_pm_genpd, &domain->genpd);
+		if (ret)
+			return dev_err_probe(dev, ret, "failed to add pm_genpd release callback\n");
 		/*
 		 * We use runtime PM to trigger power on/off of the upstream GPC
 		 * domain, as a strict hierarchical parent/child power domain
@@ -288,39 +301,19 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
 		bc->onecell_data.domains[i] = &domain->genpd;
 	}
 
-	pm_runtime_enable(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to enable pm-runtime\n");
 
 	ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data);
-	if (ret) {
-		dev_err_probe(dev, ret, "failed to add power domain provider\n");
-		goto cleanup_pds;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to add power domain provider\n");
 
-	dev_set_drvdata(dev, bc);
+	ret = devm_add_action_or_reset(dev, imx93_release_genpd_provider, dev->of_node);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to add genpd_provider release callback\n");
 
 	return 0;
-
-cleanup_pds:
-	for (i--; i >= 0; i--)
-		pm_genpd_remove(&bc->domains[i].genpd);
-
-	return ret;
-}
-
-static void imx93_blk_ctrl_remove(struct platform_device *pdev)
-{
-	struct imx93_blk_ctrl *bc = dev_get_drvdata(&pdev->dev);
-	int i;
-
-	of_genpd_del_provider(pdev->dev.of_node);
-
-	pm_runtime_disable(&pdev->dev);
-
-	for (i = 0; i < bc->onecell_data.num_domains; i++) {
-		struct imx93_blk_ctrl_domain *domain = &bc->domains[i];
-
-		pm_genpd_remove(&domain->genpd);
-	}
 }
 
 static const struct imx93_blk_ctrl_domain_data imx93_media_blk_ctl_domain_data[] = {
@@ -455,7 +448,6 @@ MODULE_DEVICE_TABLE(of, imx93_blk_ctrl_of_match);
 
 static struct platform_driver imx93_blk_ctrl_driver = {
 	.probe = imx93_blk_ctrl_probe,
-	.remove = imx93_blk_ctrl_remove,
 	.driver = {
 		.name = "imx93-blk-ctrl",
 		.of_match_table = imx93_blk_ctrl_of_match,

-- 
2.47.3

[PATCH v2 3/3] pmdomain: imx93-blk-ctrl: add support for optional subnodes

[Marco Felsch]

This particular block can have DT subnodes describing the LVDS LDB, MIPI
DSI and parallel DPI bridge.

Scan for possible sub-devices within the driver, instead of misusing the
simple-bus to perform the scan.

Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/pmdomain/imx/imx93-blk-ctrl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pmdomain/imx/imx93-blk-ctrl.c b/drivers/pmdomain/imx/imx93-blk-ctrl.c
index 49610f2389c3bbaf4de4133918fbcacb7924f672..1afc78b034fad8fa09a3e8527586387156fc2543 100644
--- a/drivers/pmdomain/imx/imx93-blk-ctrl.c
+++ b/drivers/pmdomain/imx/imx93-blk-ctrl.c
@@ -7,6 +7,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
@@ -313,6 +314,10 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to add genpd_provider release callback\n");
 
+	ret = devm_of_platform_populate(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to populate blk-ctrl sub-devices\n");
+
 	return 0;
 }
 

-- 
2.47.3

Re: [PATCH v2 2/3] pmdomain: imx93-blk-ctrl: convert to devm_* only

[Frank Li]

On Tue, Dec 02, 2025 at 02:21:03PM +0100, Marco Felsch wrote:
> Convert the driver to devm_ APIs only by making use of
> devm_add_action_or_reset() and devm_pm_runtime_enable() to simplify the
> probe error path and to drop the .remove() callback. This also ensures
> that the device release order equals the device probe error path order.
>
> Furthermore drop the dev_set_drvdata() usage since the only user was the
> .remove() callback which is removed by this commit.
>
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> ---

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

>  drivers/pmdomain/imx/imx93-blk-ctrl.c | 66 +++++++++++++++--------------------
>  1 file changed, 29 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/pmdomain/imx/imx93-blk-ctrl.c b/drivers/pmdomain/imx/imx93-blk-ctrl.c
> index 2aa163aef8de4ee901b9cde76ce2aad246c8c08a..49610f2389c3bbaf4de4133918fbcacb7924f672 100644
> --- a/drivers/pmdomain/imx/imx93-blk-ctrl.c
> +++ b/drivers/pmdomain/imx/imx93-blk-ctrl.c
> @@ -188,6 +188,20 @@ static int imx93_blk_ctrl_power_off(struct generic_pm_domain *genpd)
>  	return 0;
>  }
>
> +static void imx93_release_genpd_provider(void *data)
> +{
> +	struct device_node *of_node = data;
> +
> +	of_genpd_del_provider(of_node);
> +}
> +
> +static void imx93_release_pm_genpd(void *data)
> +{
> +	struct generic_pm_domain *genpd = data;
> +
> +	pm_genpd_remove(genpd);
> +}
> +
>  static struct lock_class_key blk_ctrl_genpd_lock_class;
>
>  static int imx93_blk_ctrl_probe(struct platform_device *pdev)
> @@ -256,10 +270,8 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
>  			domain->clks[j].id = data->clk_names[j];
>
>  		ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks);
> -		if (ret) {
> -			dev_err_probe(dev, ret, "failed to get clock\n");
> -			goto cleanup_pds;
> -		}
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to get clock\n");
>
>  		domain->genpd.name = data->name;
>  		domain->genpd.power_on = imx93_blk_ctrl_power_on;
> @@ -267,11 +279,12 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
>  		domain->bc = bc;
>
>  		ret = pm_genpd_init(&domain->genpd, NULL, true);
> -		if (ret) {
> -			dev_err_probe(dev, ret, "failed to init power domain\n");
> -			goto cleanup_pds;
> -		}
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to init power domain\n");
>
> +		ret = devm_add_action_or_reset(dev, imx93_release_pm_genpd, &domain->genpd);
> +		if (ret)
> +			return dev_err_probe(dev, ret, "failed to add pm_genpd release callback\n");
>  		/*
>  		 * We use runtime PM to trigger power on/off of the upstream GPC
>  		 * domain, as a strict hierarchical parent/child power domain
> @@ -288,39 +301,19 @@ static int imx93_blk_ctrl_probe(struct platform_device *pdev)
>  		bc->onecell_data.domains[i] = &domain->genpd;
>  	}
>
> -	pm_runtime_enable(dev);
> +	ret = devm_pm_runtime_enable(dev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to enable pm-runtime\n");
>
>  	ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data);
> -	if (ret) {
> -		dev_err_probe(dev, ret, "failed to add power domain provider\n");
> -		goto cleanup_pds;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to add power domain provider\n");
>
> -	dev_set_drvdata(dev, bc);
> +	ret = devm_add_action_or_reset(dev, imx93_release_genpd_provider, dev->of_node);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to add genpd_provider release callback\n");
>
>  	return 0;
> -
> -cleanup_pds:
> -	for (i--; i >= 0; i--)
> -		pm_genpd_remove(&bc->domains[i].genpd);
> -
> -	return ret;
> -}
> -
> -static void imx93_blk_ctrl_remove(struct platform_device *pdev)
> -{
> -	struct imx93_blk_ctrl *bc = dev_get_drvdata(&pdev->dev);
> -	int i;
> -
> -	of_genpd_del_provider(pdev->dev.of_node);
> -
> -	pm_runtime_disable(&pdev->dev);
> -
> -	for (i = 0; i < bc->onecell_data.num_domains; i++) {
> -		struct imx93_blk_ctrl_domain *domain = &bc->domains[i];
> -
> -		pm_genpd_remove(&domain->genpd);
> -	}
>  }
>
>  static const struct imx93_blk_ctrl_domain_data imx93_media_blk_ctl_domain_data[] = {
> @@ -455,7 +448,6 @@ MODULE_DEVICE_TABLE(of, imx93_blk_ctrl_of_match);
>
>  static struct platform_driver imx93_blk_ctrl_driver = {
>  	.probe = imx93_blk_ctrl_probe,
> -	.remove = imx93_blk_ctrl_remove,
>  	.driver = {
>  		.name = "imx93-blk-ctrl",
>  		.of_match_table = imx93_blk_ctrl_of_match,
>
> --
> 2.47.3
>