linux-kernel - Re: [PATCH v6 6/8] pinctrl: cygnus: add gpio/pinconf driver

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Message-ID: <54FF306C.7020407@broadcom.com>
Date:	Tue, 10 Mar 2015 10:57:00 -0700
From:	Ray Jui <rjui@...adcom.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Alexandre Courbot <gnurou@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Grant Likely" <grant.likely@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Matt Porter <mporter@...aro.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"Paul Bolle" <pebolle@...cali.nl>,
	Scott Branden <sbranden@...adcom.com>,
	"Dmitry Torokhov" <dtor@...gle.com>,
	Anatol Pomazau <anatol@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 6/8] pinctrl: cygnus: add gpio/pinconf driver

Hi Linus,

On 3/10/2015 3:20 AM, Linus Walleij wrote:
> On Mon, Mar 9, 2015 at 9:45 PM, Ray Jui <rjui@...adcom.com> wrote:
> 
>> This adds the initial support of the Broadcom Cygnus GPIO/PINCONF driver
>> that supports all 3 GPIO controllers on Cygnus including the ASIU GPIO
>> controller, the chipCommonG GPIO controller, and the always-on GPIO
>> controller. Basic PINCONF configurations such as bias pull up/down, and
>> drive strength are also supported in this driver.
>>
>> Pins from the ASIU GPIO controller can be individually muxed to GPIO
>> function, through interaction with the Cygnus IOMUX controller
>>
>> Signed-off-by: Ray Jui <rjui@...adcom.com>
>> Reviewed-by: Scott Branden <sbranden@...adcom.com>
>> Tested-by: Dmitry Torokhov <dtor@...omium.org>
> 
> Patch applied! But please look at this:
> 
>> +#include <linux/gpio.h>
> 
> Doesn't just #include <linux/gpio/driver.h> work?
> 

I think I need linux/gpio.h for gpiochip_add_pin_range and some related
APIs.

>> +static int __init cygnus_gpio_init(void)
>> +{
>> +       return platform_driver_probe(&cygnus_gpio_driver, cygnus_gpio_probe);
>> +}
>> +arch_initcall_sync(cygnus_gpio_init);
> 
> arch_initcall_sync() is a bit brutal.
> 
> Can you please investigate if you can have this as a normal device_initcall()
> utilizing deferred probe if necessary?
> 
> Follow-up patches accepted!
> 

I understand. Further investigation is needed and this may take a while,
since a lot of our Cygnus drivers depend on GPIO and regulators (and all
need to be converted to check against deferred probe errors). If
possible, I'll definitely fix this.

> Yours,
> Linus Walleij
> 
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