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Date: Mon, 13 Nov 2006 14:26:14 -0600 From: Bill Gatliff <bgat@...lgatliff.com> To: David Brownell <david-b@...bell.net> CC: Paul Mundt <lethal@...ux-sh.org>, Linux Kernel list <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>, Andrew Victor <andrew@...people.com>, Haavard Skinnemoen <hskinnemoen@...el.com>, jamey.hicks@...com, Kevin Hilman <khilman@...sta.com>, Nicolas Pitre <nico@....org>, Russell King <rmk@....linux.org.uk>, Tony Lindgren <tony@...mide.com> Subject: Re: [patch/rfc 2.6.19-rc5] arch-neutral GPIO calls David Brownell wrote: >On Monday 13 November 2006 11:43 am, Bill Gatliff wrote: > > >>Maybe we should codify an approach for that now, i.e. add to the >>reference implementation some code that hands off out-of-range GPIO >>lines to a function in the machine descriptor: >> >> >>+static inline int gpio_direction_input(unsigned gpio) >>+ { if (gpio < OMAP_MAX_ARCH_GPIO) return __gpio_set_direction(gpio, 1); >>+ else if(mdesc->platform_gpio_set_direction) platform_gpio_set_direction(gpio, 1); } >> >> >>... conveniently neglecting the way you find mdesc. :) >> >> > >Nah; look at arch/arm/plat-omap/gpio.c and ignore the mess, but observe >that what you see there is essentially a bunch of "gpio controller" >classes using the ugly "switch(type)" dispatch scheme instead of the >prettier "type->op()" dispatch scheme. All that stuff needs to be >cleaner, but for now it'd suffice to add a new FPGA typecode. > > Agreed. But if we add to the machine descriptor, then not only do you not need to touch arch-omap/gpio.c, but you can take that switch statement out, too. Just one less chunk of code to tweak when a new platform is supported. b.g. -- Bill Gatliff bgat@...lgatliff.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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