linux-kernel - Re: [PATCH v6 2/2] PCI: altera: support dt binding update

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Message-ID: <20240611170410.GA989554@bhelgaas>
Date: Tue, 11 Jun 2024 12:04:10 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: matthew.gerlach@...ux.intel.com
Cc: lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
	bhelgaas@...gle.com, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, joyce.ooi@...el.com, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] PCI: altera: support dt binding update

On Tue, Jun 11, 2024 at 11:35:25AM -0500, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> 
> Add support for the device tree binding update. As part of
> converting the binding document from text to yaml, with schema
> validation, a device tree subnode was added to properly map
> legacy interrupts. Maintain backward compatibility with previous binding.

If something was *added* to the binding, I think it would be helpful
to split that into two patches: (1) convert to YAML with zero
functional changes, (2) add the new stuff.  Adding something at the
same time as changing the format makes it hard to review.

Then we could have a more specific subject and commit log for *this*
patch.

> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> ---
>  drivers/pci/controller/pcie-altera.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
> index a9536dc4bf96..88511fa2f078 100644
> --- a/drivers/pci/controller/pcie-altera.c
> +++ b/drivers/pci/controller/pcie-altera.c
> @@ -667,11 +667,20 @@ static void altera_pcie_isr(struct irq_desc *desc)
>  static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
>  {
>  	struct device *dev = &pcie->pdev->dev;
> -	struct device_node *node = dev->of_node;
> +	struct device_node *node, *child;
>  
>  	/* Setup INTx */
> +	child = of_get_next_child(dev->of_node, NULL);
> +	if (child)
> +		node = child;
> +	else
> +		node = dev->of_node;
> +
>  	pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
> -					&intx_domain_ops, pcie);
> +						 &intx_domain_ops, pcie);
> +	if (child)
> +		of_node_put(child);
> +
>  	if (!pcie->irq_domain) {
>  		dev_err(dev, "Failed to get a INTx IRQ domain\n");
>  		return -ENOMEM;
> -- 
> 2.34.1
>