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SubjectRe: [PATCH] ata: pata_of_platform: Use of_irq_to_resource() to populate IRQ resource
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Hello!

On 17.12.2021 3:12, Lad Prabhakar wrote:

> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypassed the hierarchical setup and messed up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use of_irq_to_resource().
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> Hi,
>
> Dropping usage of platform_get_resource() was agreed based on
> the discussion [0].
>
> [0] https://patchwork.kernel.org/project/linux-renesas-soc/
> patch/20211209001056.29774-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
>
> Cheers,
> Prabhakar
> ---
> drivers/ata/pata_of_platform.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/ata/pata_of_platform.c b/drivers/ata/pata_of_platform.c
> index 35aa158fc976..557f349eb533 100644
> --- a/drivers/ata/pata_of_platform.c
> +++ b/drivers/ata/pata_of_platform.c
[...]
> @@ -45,7 +47,9 @@ static int pata_of_platform_probe(struct platform_device *ofdev)
> return -EINVAL;
> }
>
> - irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
> + irq = of_irq_to_resource(dn, 0, &irq_res);

Why not use platform_get_irq_optional()?

> + if (irq <= 0 && irq != -ENXIO)
> + return irq ? irq : -ENXIO;
>
> of_property_read_u32(dn, "reg-shift", &reg_shift);
>
[...]

MBR, Sergey

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