[PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[Johan Hovold]

Since commit c6e126de43e7 ("of: Keep track of populated platform
devices") child devices will not be created by of_platform_populate()
if the devices had previously been deregistered individually so that the
OF_POPULATED flag is still set in the corresponding OF nodes.

Switch to using of_platform_depopulate() instead of open coding so that
the child devices are created if the driver is rebound.

Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
Cc: stable@vger.kernel.org	# 3.16
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/mfd/qcom-pm8xxx.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/mfd/qcom-pm8xxx.c b/drivers/mfd/qcom-pm8xxx.c
index 1149f7102a36..0cf374c015ce 100644
--- a/drivers/mfd/qcom-pm8xxx.c
+++ b/drivers/mfd/qcom-pm8xxx.c
@@ -577,17 +577,11 @@ static int pm8xxx_probe(struct platform_device *pdev)
 	return rc;
 }
 
-static int pm8xxx_remove_child(struct device *dev, void *unused)
-{
-	platform_device_unregister(to_platform_device(dev));
-	return 0;
-}
-
 static void pm8xxx_remove(struct platform_device *pdev)
 {
 	struct pm_irq_chip *chip = platform_get_drvdata(pdev);
 
-	device_for_each_child(&pdev->dev, NULL, pm8xxx_remove_child);
+	of_platform_depopulate(&pdev->dev);
 	irq_domain_remove(chip->irqdomain);
 }
 
-- 
2.51.2

Re: [PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[Konrad Dybcio]

On 12/19/25 12:09 PM, Johan Hovold wrote:
> Since commit c6e126de43e7 ("of: Keep track of populated platform
> devices") child devices will not be created by of_platform_populate()
> if the devices had previously been deregistered individually so that the
> OF_POPULATED flag is still set in the corresponding OF nodes.
> 
> Switch to using of_platform_depopulate() instead of open coding so that
> the child devices are created if the driver is rebound.
> 
> Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
> Cc: stable@vger.kernel.org	# 3.16
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

Re: [PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[Dmitry Baryshkov]

On Fri, Dec 19, 2025 at 12:09:47PM +0100, Johan Hovold wrote:
> Since commit c6e126de43e7 ("of: Keep track of populated platform
> devices") child devices will not be created by of_platform_populate()
> if the devices had previously been deregistered individually so that the
> OF_POPULATED flag is still set in the corresponding OF nodes.
> 
> Switch to using of_platform_depopulate() instead of open coding so that
> the child devices are created if the driver is rebound.
> 
> Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
> Cc: stable@vger.kernel.org	# 3.16
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
>  drivers/mfd/qcom-pm8xxx.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry

Re: [PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[Lee Jones]

On Fri, 19 Dec 2025, Johan Hovold wrote:

> Since commit c6e126de43e7 ("of: Keep track of populated platform
> devices") child devices will not be created by of_platform_populate()
> if the devices had previously been deregistered individually so that the
> OF_POPULATED flag is still set in the corresponding OF nodes.
> 
> Switch to using of_platform_depopulate() instead of open coding so that
> the child devices are created if the driver is rebound.
> 
> Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
> Cc: stable@vger.kernel.org	# 3.16
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
>  drivers/mfd/qcom-pm8xxx.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/mfd/qcom-pm8xxx.c b/drivers/mfd/qcom-pm8xxx.c
> index 1149f7102a36..0cf374c015ce 100644
> --- a/drivers/mfd/qcom-pm8xxx.c
> +++ b/drivers/mfd/qcom-pm8xxx.c
> @@ -577,17 +577,11 @@ static int pm8xxx_probe(struct platform_device *pdev)
>  	return rc;
>  }
>  
> -static int pm8xxx_remove_child(struct device *dev, void *unused)
> -{
> -	platform_device_unregister(to_platform_device(dev));
> -	return 0;
> -}
> -
>  static void pm8xxx_remove(struct platform_device *pdev)
>  {
>  	struct pm_irq_chip *chip = platform_get_drvdata(pdev);
>  
> -	device_for_each_child(&pdev->dev, NULL, pm8xxx_remove_child);
> +	of_platform_depopulate(&pdev->dev);
>  	irq_domain_remove(chip->irqdomain);

Have you explored devm_of_platform_populate()?

-- 
Lee Jones [李琼斯]

Re: [PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[Johan Hovold]

On Fri, Jan 09, 2026 at 03:27:38PM +0000, Lee Jones wrote:
> On Fri, 19 Dec 2025, Johan Hovold wrote:
> 
> > Since commit c6e126de43e7 ("of: Keep track of populated platform
> > devices") child devices will not be created by of_platform_populate()
> > if the devices had previously been deregistered individually so that the
> > OF_POPULATED flag is still set in the corresponding OF nodes.
> > 
> > Switch to using of_platform_depopulate() instead of open coding so that
> > the child devices are created if the driver is rebound.
> > 
> > Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
> > Cc: stable@vger.kernel.org	# 3.16
> > Signed-off-by: Johan Hovold <johan@kernel.org>

> > -static int pm8xxx_remove_child(struct device *dev, void *unused)
> > -{
> > -	platform_device_unregister(to_platform_device(dev));
> > -	return 0;
> > -}
> > -
> >  static void pm8xxx_remove(struct platform_device *pdev)
> >  {
> >  	struct pm_irq_chip *chip = platform_get_drvdata(pdev);
> >  
> > -	device_for_each_child(&pdev->dev, NULL, pm8xxx_remove_child);
> > +	of_platform_depopulate(&pdev->dev);
> >  	irq_domain_remove(chip->irqdomain);
> 
> Have you explored devm_of_platform_populate()?

Yeah, but mixing devres and explicit release risks introducing bugs. And
here we want to make sure the children are deregistered before freeing
the irqdomain.

Johan

Re: (subset) [PATCH] mfd: qcom-pm8xxx: fix OF populate on driver rebind

[Lee Jones]

On Fri, 19 Dec 2025 12:09:47 +0100, Johan Hovold wrote:
> Since commit c6e126de43e7 ("of: Keep track of populated platform
> devices") child devices will not be created by of_platform_populate()
> if the devices had previously been deregistered individually so that the
> OF_POPULATED flag is still set in the corresponding OF nodes.
> 
> Switch to using of_platform_depopulate() instead of open coding so that
> the child devices are created if the driver is rebound.
> 
> [...]

Applied, thanks!

[1/1] mfd: qcom-pm8xxx: fix OF populate on driver rebind
      commit: 0b6a34ca0ac3b6e02389a2594f0638e5b9c65814

--
Lee Jones [李琼斯]