linux-kernel - Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq

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Date:   Mon, 20 Dec 2021 11:16:18 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Chris Brandt <chris.brandt@...esas.com>,
        linux-i2c@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to
 get the interrupt

Hi Prabhakar,

> +	if (!np) {

Very minor nit: Maybe 'if (np)' and switch the blocks? Positive logic is
a tad easier to read.

> +		struct resource *res;
> +		resource_size_t n;
> +
> +		while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
> +			for (n = res->start; n <= res->end; n++) {
> +				ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
> +						       0, dev_name(&dev->dev), pd);
> +				if (ret) {
> +					dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> +					return ret;
> +				}
> +			}
> +			k++;
> +		}

Yeah, it is good to keep the legacy block as is.

> +		do {
> +			irq = platform_get_irq_optional(dev, k);
> +			if (irq <= 0 && irq != -ENXIO)
> +				return irq ? irq : -ENXIO;
> +			if (irq == -ENXIO)
> +				break;
> +			ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
> +					       0, dev_name(&dev->dev), pd);
>  			if (ret) {
> -				dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> +				dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
>  				return ret;
>  			}
> -		}
> -		k++;
> +			k++;
> +		} while (irq);

In addition to the 'irq == 0' case from patch 1, I tried to shorten the
block for the np-case. I only came up with this. The assigntment and
comparison of the while-argument is not exactly pretty, but the block
itself is easier to read. I'll let you decide.

		while (irq = platform_get_irq_optional(dev, k) != -ENXIO) {
			if (irq < 0)
				return irq;

			ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
					       0, dev_name(&dev->dev), pd);
			if (ret) {
				dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
				return ret;
			}
			k++;
		}

Only brainstorming, not even build tested.

All the best,

   Wolfram


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