linux-kernel - Re: [PATCH 1/5] PCI/pwrctl: Use of_platform_device

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Message-ID: <CACMJSeuBb9VmRrGJnak6D3Ddow+-OMb+79uZzUUaWe3BF1SgTg@mail.gmail.com>
Date: Wed, 23 Oct 2024 11:18:51 +0200
From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
To: manivannan.sadhasivam@...aro.org
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Johan Hovold <johan+linaro@...nel.org>, Abel Vesa <abel.vesa@...aro.org>, 
	Stephan Gerhold <stephan.gerhold@...aro.org>, 
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
	Bjorn Andersson <bjorn.andersson@....qualcomm.com>
Subject: Re: [PATCH 1/5] PCI/pwrctl: Use of_platform_device_create() to create
 pwrctl devices

On Tue, 22 Oct 2024 at 12:28, Manivannan Sadhasivam via B4 Relay
<devnull+manivannan.sadhasivam.linaro.org@...nel.org> wrote:
>
> From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
>
> of_platform_populate() API creates platform devices by descending through
> the children of the parent node. But it provides no control over the child
> nodes, which makes it difficult to add checks for the child nodes in the
> future. So use of_platform_device_create() API together with
> for_each_child_of_node_scoped() so that it is possible to add checks for
> each node before creating the platform device.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/pci/bus.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 55c853686051..959044b059b5 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -13,6 +13,7 @@
>  #include <linux/ioport.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
> +#include <linux/platform_device.h>
>  #include <linux/proc_fs.h>
>  #include <linux/slab.h>
>
> @@ -329,6 +330,7 @@ void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
>  void pci_bus_add_device(struct pci_dev *dev)
>  {
>         struct device_node *dn = dev->dev.of_node;
> +       struct platform_device *pdev;
>         int retval;
>
>         /*
> @@ -351,11 +353,11 @@ void pci_bus_add_device(struct pci_dev *dev)
>         pci_dev_assign_added(dev, true);
>
>         if (dev_of_node(&dev->dev) && pci_is_bridge(dev)) {
> -               retval = of_platform_populate(dev_of_node(&dev->dev), NULL, NULL,
> -                                             &dev->dev);
> -               if (retval)
> -                       pci_err(dev, "failed to populate child OF nodes (%d)\n",
> -                               retval);
> +               for_each_child_of_node_scoped(dn, child) {

Since we won't be populating any disabled nodes, I'd use
for_each_available_child_of_node_scoped() here.

Bart

> +                       pdev = of_platform_device_create(child, NULL, &dev->dev);
> +                       if (!pdev)
> +                               pci_err(dev, "failed to create OF node: %s\n", child->name);
> +               }
>         }
>  }
>  EXPORT_SYMBOL_GPL(pci_bus_add_device);
>
> --
> 2.25.1
>
>