linux-kernel - Re: [PATCH 4/5] net: mvmdio: allow Device Tree and platform device to coexist

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Message-ID: <20130129175912.GE25646@obsidianresearch.com>
Date:	Tue, 29 Jan 2013 10:59:12 -0700
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Florian Fainelli <florian@...nwrt.org>
Cc:	davem@...emloft.net,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>, linux-doc@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	netdev@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	linux-arm-kernel@...ts.infradead.org,
	Rob Landley <rob@...dley.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linuxppc-dev@...ts.ozlabs.org,
	Lennert Buytenhek <buytenh@...tstofly.org>
Subject: Re: [PATCH 4/5] net: mvmdio: allow Device Tree and platform device
 to coexist

On Tue, Jan 29, 2013 at 04:24:07PM +0100, Florian Fainelli wrote:
  
> -	dev->err_interrupt = irq_of_parse_and_map(pdev->dev.of_node, 0);
> +	if (pdev->dev.of_node) {
> +		dev->regs = of_iomap(pdev->dev.of_node, 0);
> +		if (!dev->regs) {
> +			dev_err(&pdev->dev, "No SMI register address given in DT\n");
> +			ret = -ENODEV;
> +			goto out_free;
> +		}
> +
> +		dev->err_interrupt = irq_of_parse_and_map(pdev->dev.of_node, 0);
> +	} else {
> +		r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> +		dev->regs = ioremap(r->start, resource_size(r));
> +		if (!dev->regs) {
> +			dev_err(&pdev->dev, "No SMI register address given\n");
> +			ret = -ENODEV;
> +			goto out_free;
> +		}
> +
> +		dev->err_interrupt = platform_get_irq(pdev, 0);
> +	}

Why do you have these different paths for OF and platform? AFAIK these
days when a OF device is automatically converted into a platform
device all the struct resources are created too, so you can't you just
use platform_get_resource and devm_request_and_ioremap for both flows?

Ditto for the interrupt - platform_get_irq should work in both cases?

Jason
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