linux-kernel - Re: [PATCH] soc: ti: smartreflex: Use platform_get_irq

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Message-ID: <20211220133145.uiww2nuormjks7gc@unruly>
Date:   Mon, 20 Dec 2021 07:31:45 -0600
From:   Nishanth Menon <nm@...com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        <SantoshShilimkarssantosh@...nel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Tony Lindgren <tony@...mide.com>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] soc: ti: smartreflex: Use platform_get_irq_optional() to
 get the interrupt

On 15:39-20211218, 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().
> 
> 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/soc/ti/smartreflex.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/soc/ti/smartreflex.c b/drivers/soc/ti/smartreflex.c
> index b5b2fa538d5c..4f311e00fa46 100644
> --- a/drivers/soc/ti/smartreflex.c
> +++ b/drivers/soc/ti/smartreflex.c
> @@ -819,7 +819,7 @@ static int omap_sr_probe(struct platform_device *pdev)
>  {
>  	struct omap_sr *sr_info;
>  	struct omap_sr_data *pdata = pdev->dev.platform_data;
> -	struct resource *mem, *irq;
> +	struct resource *mem;
>  	struct dentry *nvalue_dir;
>  	int i, ret = 0;
>  
> @@ -844,7 +844,12 @@ static int omap_sr_probe(struct platform_device *pdev)
>  	if (IS_ERR(sr_info->base))
>  		return PTR_ERR(sr_info->base);
>  
> -	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	ret = platform_get_irq_optional(pdev, 0);
> +	if (ret <= 0 && ret != -ENXIO)
> +		return ret ? ret : -ENXIO;
^^ minor: This is a better check compared to what existed, might be good
to add that to commit message, also does this cause the driver to fail
probe silently?

> +	if (ret > 0)
> +		sr_info->irq = ret;
> +	ret = 0;
>  
>  	sr_info->fck = devm_clk_get(pdev->dev.parent, "fck");
>  	if (IS_ERR(sr_info->fck))
> @@ -870,9 +875,6 @@ static int omap_sr_probe(struct platform_device *pdev)
>  	sr_info->autocomp_active = false;
>  	sr_info->ip_type = pdata->ip_type;
>  
> -	if (irq)
> -		sr_info->irq = irq->start;
> -
>  	sr_set_clk_length(sr_info);
>  
>  	list_add(&sr_info->node, &sr_list);
> -- 
> 2.17.1
> 

Otherwise, looks fine to me. but it is a little late since I have sent out my
5.17 PR. We can try for rc OR 5.18.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D)/Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D