Re: [PATCHv2] PCI: xilinx: use fwnode_irq_get() for INTx IRQ lookup

On Thu, Jul 16, 2026 at 01:58:11PM -0700, Rosen Penev wrote:
> Replace irq_of_parse_and_map() with fwnode_irq_get(dev_fwnode(dev), 0)
> in xilinx_pcie_parse_dt(). For an OF-backed device this is equivalent to
> the previous call, but uses the generic firmware-node API.
> 

What is the benefit of using fwnode API for OF only driver?

- Mani

> Unlike irq_of_parse_and_map(), fwnode_irq_get() returns a positive IRQ or
> a negative errno and never 0 (it rewrites 0 to -EINVAL). Store the result
> in an int and check for irq < 0, returning the error (including
> -EPROBE_DEFER). This also adds the error handling the previous code
> lacked, where irq_of_parse_and_map() failures were passed straight into
> devm_request_irq().
> 
> Built for ARM (multi_v7_defconfig + CONFIG_PCIE_XILINX) with LLVM=1;
> drivers/pci/controller/pcie-xilinx.o compiles cleanly.
> 
> Assisted-by: opencode:hy3-free
> Signed-off-by: Rosen Penev <[email protected]>
> ---
>  v2: use dev_err_probe to handle EPROBE_DEFER.
>  drivers/pci/controller/pcie-xilinx.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 4aa139abac16..58532296182f 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -20,10 +20,10 @@
>  #include <linux/of_address.h>
>  #include <linux/of_pci.h>
>  #include <linux/of_platform.h>
> -#include <linux/of_irq.h>
>  #include <linux/pci.h>
>  #include <linux/pci-ecam.h>
>  #include <linux/platform_device.h>
> +#include <linux/property.h>
>  
>  #include "../pci.h"
>  
> @@ -535,7 +535,7 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie *pcie)
>  	struct device *dev = pcie->dev;
>  	struct device_node *node = dev->of_node;
>  	struct resource regs;
> -	unsigned int irq;
> +	int irq;
>  	int err;
>  
>  	err = of_address_to_resource(node, 0, &regs);
> @@ -548,7 +548,10 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie *pcie)
>  	if (IS_ERR(pcie->reg_base))
>  		return PTR_ERR(pcie->reg_base);
>  
> -	irq = irq_of_parse_and_map(node, 0);
> +	irq = fwnode_irq_get(dev_fwnode(dev), 0);
> +	if (irq < 0)
> +		return irq;
> +
>  	err = devm_request_irq(dev, irq, xilinx_pcie_intr_handler,
>  			       IRQF_SHARED | IRQF_NO_THREAD,
>  			       "xilinx-pcie", pcie);
> @@ -585,10 +588,8 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
>  	pcie->dev = dev;
>  
>  	err = xilinx_pcie_parse_dt(pcie);
> -	if (err) {
> -		dev_err(dev, "Parsing DT failed\n");
> -		return err;
> -	}
> +	if (err)
> +		return dev_err_probe(dev, err, "Parsing DT failed\n");
>  
>  	xilinx_pcie_init_port(pcie);
>  
> -- 
> 2.55.0
> 

-- 
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