IronPort-SDR: BO/KgfzkseCrtzJ/wSgT3s0XF37sQyF48k9+bkzQ+jxgOuDvWLV1BU9zT1MfLRvQrIssbqIAXG
 z/oWxdBlliC4LYo/JSrl4ybBMgQ1twwMkx6YoLq/gIBKISeq0uLGxKy6FbD58v0S4jQwka/Bf+
 hFBKHL33s5Bjoa0FUjCiZPf0wxjANBE5Wha5Q0AKc1NlZLOHMEYd75o9yR4UaMHVHqZjCCLks+
 ecJzYlhfAMqV+2K/t+s87gwSNPlGwuVNDlgN+/nbz8TvvytmBzSD6oia42duFDwaevpee+vsVd
 t/yW6W6T59EK89UyBD2eXeC5
IronPort-SDR: 7iFWoSvROlcJ//ZE3t58Ja5GXyqSUtfmkFPkLciSyMJWAmuL5ORpWr9cK29OfQfWsJrzZj8bjz
 i9H8Bg87Tum8KG0cTetQfjBUWUBvrNlvuYS2pdw9l6+ErDdOJy1b99Z1aHPwU1Mh5jXkjKYvFt
 JBMV74ny2SGqDW3kk2Sr9AajmSpPaoAlvb1wPJYAWwucheT3XcvsZV0Emi/4z31ud+XLixkJBl
 q54Fwfq5HcjndVOO6KNwZqKVeIr3xPtVsxDEKgeVPznMmBMK0Zma77NQaaZ9ygyvwbHpCU599V
 UtI=
WDCIronportException: Internal
Message-ID: <c9c63445-3ecc-4a0e-3e70-3b5942e0d5d5@opensource.wdc.com>
Date:   Tue, 11 Jan 2022 07:53:07 +0900
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0)
 Gecko/20100101 Thunderbird/91.4.1
Subject: Re: [PATCH v5] ata: pata_of_platform: Use platform_get_irq_optional()
 to get the interrupt
Content-Language: en-US
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Prabhakar <prabhakar.csengg@gmail.com>,
        linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20220105181721.13087-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
From:   Damien Le Moal <damien.lemoal@opensource.wdc.com>
Organization: Western Digital
In-Reply-To: <20220105181721.13087-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 2022/01/06 3:17, 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 bypasses the hierarchical setup and messes up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional().
> 
> Note the code does not set the IRQ flags as this is handled automatically
> for DT.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> Hi All,
> 
> This patch is part of series [1]. I'll re-visit merging of pata_of_platform
> into pata_platform at later point. As my primary focus is removal of static
> setup of IRQ resource from DT core code.
> 
> [1] https://patchwork.ozlabs.org/project/linux-ide/list/?series=278349
> 
> v4->v5
> * Set end member of IRQ resource
> * Clear irq_res un-conditionally.
> 
> Cheers,
> Prabhakar
> ---
>  drivers/ata/pata_of_platform.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/ata/pata_of_platform.c b/drivers/ata/pata_of_platform.c
> index 35aa158fc976..c3a40b717dcd 100644
> --- a/drivers/ata/pata_of_platform.c
> +++ b/drivers/ata/pata_of_platform.c
> @@ -25,11 +25,12 @@ static int pata_of_platform_probe(struct platform_device *ofdev)
>  	struct device_node *dn = ofdev->dev.of_node;
>  	struct resource io_res;
>  	struct resource ctl_res;
> -	struct resource *irq_res;
> +	struct resource irq_res;
>  	unsigned int reg_shift = 0;
>  	int pio_mode = 0;
>  	int pio_mask;
>  	bool use16bit;
> +	int irq;
>  
>  	ret = of_address_to_resource(dn, 0, &io_res);
>  	if (ret) {
> @@ -45,7 +46,15 @@ static int pata_of_platform_probe(struct platform_device *ofdev)
>  		return -EINVAL;
>  	}
>  
> -	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
> +	memset(&irq_res, 0, sizeof(irq_res));
> +
> +	irq = platform_get_irq_optional(ofdev, 0);
> +	if (irq < 0 && irq != -ENXIO)
> +		return irq;
> +	if (irq > 0) {
> +		irq_res.start = irq;
> +		irq_res.end = irq;
> +	}
>  
>  	of_property_read_u32(dn, "reg-shift", &reg_shift);
>  
> @@ -63,7 +72,7 @@ static int pata_of_platform_probe(struct platform_device *ofdev)
>  	pio_mask = 1 << pio_mode;
>  	pio_mask |= (1 << pio_mode) - 1;
>  
> -	return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
> +	return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq > 0 ? &irq_res : NULL,
>  				     reg_shift, pio_mask, &pata_platform_sht,
>  				     use16bit);
>  }

Andy,

Are you OK with this version ?

-- 
Damien Le Moal
Western Digital Research