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

[Pandey, Radhey Shyam]

> 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.
>
> 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 <rosenp@xxxxxxxxx>
> ---
>   drivers/pci/controller/pcie-xilinx.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 4aa139abac16..a7b069f7673a 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;

Thanks for the patch.
Nit - as Sashiko review mentioned better to update xilinx_pcie_probe() 
to use dev_err_probe() to avoid noise on defer.

Rest changes looks fine.

Thanks,
Radhey>   	err = devm_request_irq(dev, irq, xilinx_pcie_intr_handler,
>   			       IRQF_SHARED | IRQF_NO_THREAD,
>   			       "xilinx-pcie", pcie);