linux-kernel - Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding

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Date:	Fri, 30 Jan 2015 09:01:53 -0800
From:	Ray Jui <rjui@...adcom.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Scott Branden <sbranden@...adcom.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/4] pinctrl: Broadcom Cygnus pinctrl device tree binding



On 1/30/2015 6:18 AM, Linus Walleij wrote:
> On Fri, Jan 23, 2015 at 7:49 AM, Ray Jui <rjui@...adcom.com> wrote:
> 
>> I dig into the pinctrl framework code a bit more and found that I can
>> use pinctrl_request_gpio from the GPIO driver and implement
>> gpio_request_enable in the pinctrl driver.
> 
> Yep :) ain't it nice.
> 
>> The only problem I see now is that these APIs seem to expect the use of
>> global GPIO numbers?
> 
> No they don't, only if you use the deprecated pinctrl_add_gpio_range().
> 
> Instead, when you register your struct gpio_chip, use
> gpiochip_add_pin_range() and this will use relative offsets
> without relying on global GPIO numbers.
> 
> This latter call replaces pinctrl_add_gpio_range().
> 
>> I hope I'm not missing something here?
> 
> You're missing gpiochip_add_pin_range() ;)
> 
> Yours,
> Linus Walleij
> 
Yeah, I realized this while implementing the driver, :)

I'm now in the final testing/cleaning phase of both Cygnus pinmux and
gpio/pinconf driver. I really appreciate that the pinctrl framework
allows the two to work seamlessly with each other and at the same time
provides the necessary interface to bridge the two, :)

I should be able to send out the patches of the two drivers for review
sometime next week.

Thanks for the help!

Ray
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