linux-kernel - Re: [PATCH 2/3] fpga bus driver

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Date:	Sat, 2 Aug 2014 02:23:01 +0200
From:	Pavel Machek <pavel@...x.de>
To:	atull@...nsource.altera.com
Cc:	gregkh@...uxfoundation.org, jgunthorpe@...idianresearch.com,
	hpa@...or.com, monstr@...str.eu, michal.simek@...inx.com,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	pantelis.antoniou@...sulko.com, robh+dt@...nel.org,
	grant.likely@...aro.org, broonie@...nel.org, philip@...ister.org,
	rubini@...dd.com, s.trumtrar@...gutronix.de, jason@...edaemon.net,
	kyle.teske@...com, nico@...aro.org, balbi@...com,
	m.chehab@...sung.com, davidb@...eaurora.org, rob@...dley.net,
	davem@...emloft.net, cesarb@...arb.net, sameo@...ux.intel.com,
	akpm@...ux-foundation.org, linus.walleij@...aro.org,
	delicious.quinoa@...il.com, dinguyen@...nsource.altera.com,
	yvanderv@...nsource.altera.com
Subject: Re: [PATCH 2/3] fpga bus driver

Hi!

> Here's a simple example. Start with:
>   * the altera-gpio driver built in to the kernel but not in the
>     device tree.
>   * raw fpga image at /lib/firmware/soc_system.rbf
>   * Load appropriate device tree overlay in configfs by doing
>     $ mkdir /config/device-tree/overlays/1
>     $ echo socfpga_overlay.dtbo > /config/device-tree/overlays/1/path
>   * This results in the FPGA getting programmed and the altera
>     gpio driver getting probed.

Nice!

> +/* Find the fpga manager that is pointed to by a phandle */
> +struct fpga_manager *of_fpga_mgr_dev_lookup(struct device_node *node,
> +					    const char *mgr_property,
> +					    int *ret)
> +{
> +	struct fpga_manager *mgr;
> +	struct device_node *mgr_node;
> +
> +	mgr_node = of_parse_phandle(node, mgr_property, 0);
> +
> +	if (!mgr_node) {
> +		*ret = -ENODEV;
> +		return NULL;

Could IS_ERR_OR_NULL() and friends be used to get reasonable calling
convention?

Thanks,	
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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