linux-kernel - Re: [PATCH] ata: pata_of_platform: Use of_irq_to

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Message-ID: <ca168723-f113-8620-056d-ab2ee801d8fe@omp.ru>
Date:   Fri, 17 Dec 2021 12:32:59 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <linux-ide@...r.kernel.org>
CC:     Rob Herring <robh+dt@...nel.org>, <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH] ata: pata_of_platform: Use of_irq_to_resource() to
 populate IRQ resource

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@...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@...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