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

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Message-ID: <20241024133734.7iibqvjby3id4hjt@thinkpad>
Date: Thu, 24 Oct 2024 19:07:34 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Bartosz Golaszewski <bartosz.golaszewski@...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 Wed, Oct 23, 2024 at 11:18:51AM +0200, Bartosz Golaszewski wrote:
> 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.
> 

Ack.

- Mani

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