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

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Date:	Tue, 29 Jan 2013 16:48:57 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Florian Fainelli <florian@...nwrt.org>
Cc:	davem@...emloft.net, Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org
Subject: Re: [PATCH 4/5] net: mvmdio: allow Device Tree and platform device
 to coexist

Dear Florian Fainelli,

On Tue, 29 Jan 2013 16:24:07 +0100, Florian Fainelli wrote:
> This patch changes the Marvell MDIO driver to be registered by using
> both Device Tree and platform device methods. The driver voluntarily
> does not use devm_ioremap() to share the same error path for Device Tree
> and non-Device Tree cases.

Not sure why you think devm_ioremap() can't be used here. Maybe I'm
missing something, but could you explain? If you use devm_ioremap(),
then basically you don't need to do anything in the error path
regarding to the I/O mapping... since it's the whole purpose of the
devm_*() stuff to automagically undo things in the error case, and in
the ->remove() code.

> -	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);
> +	}

I think you can do a devm_ioremap() and a platform_get_irq() in both
cases here, and therefore keep the code common between the DT case and
the !DT case.

Thanks,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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