linux-kernel - Re: [PATCH v2 2/7] ARM: tegra: add gpiod

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Date:	Sat, 23 Nov 2013 14:36:36 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Chris Ball <cjb@...top.org>,
	Johannes Berg <johannes@...solutions.net>,
	Rhyland Klein <rklein@...dia.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Rob Landley <rob@...dley.net>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Thierry Reding <thierry.reding@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/7] ARM: tegra: add gpiod_lookup table for paz00

On Sat, Nov 23, 2013 at 3:40 AM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 11/22/2013 05:14 AM, Mika Westerberg wrote:
>> From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>>
>> This makes it possible to request the gpio descriptors in
>> rfkill-gpio driver regardless of the platform.
>
> Patches 1-3,
> Tested-by: Stephen Warren <swarren@...dia.com>
>
> All the testing I did was to "cat /sys/kernel/debug/gpios" to make sure
> those two GPIOs had been correctly acquired by the driver, and that they
> changed state as expected via the command-line "rfkill {un,}block" commands.
>
> However, please note that I had to apply a couple fixes to the gpiolib
> core to get this working:
>
> 1)
>
> To solve the following build warning:
>
>> In file included from arch/arm/mach-tegra/board-paz00.c:21:0:
>> include/linux/gpio/driver.h:102:17: warning: ‘struct of_phandle_args’ declared inside parameter list [enabled by default]
>> include/linux/gpio/driver.h:102:17: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
>
> I applied:
>
>
>> diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
>> index 82eac610ce1a..5133cf29803a 100644
>> --- a/include/linux/gpio/driver.h
>> +++ b/include/linux/gpio/driver.h
>> @@ -5,6 +5,7 @@
>>
>>  struct device;
>>  struct gpio_desc;
>> +struct of_phandle_args;
>>  struct seq_file;
>>
>>  /**
>
> 2)
>
> In order to get the GPIO lookups from the rfkill driver working, I applied:
>
>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>> index ac53a9593662..b73c39f99858 100644
>> --- a/drivers/gpio/gpiolib.c
>> +++ b/drivers/gpio/gpiolib.c
>> @@ -2368,7 +2368,7 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
>>                               continue;
>>                       }
>>
>> -                     if (chip->ngpio >= p->chip_hwnum) {
>> +                     if (chip->ngpio <= p->chip_hwnum) {
>>                               dev_warn(dev, "GPIO chip %s has %d GPIOs\n",
>>                                        chip->label, chip->ngpio);
>>                               continue;

Mmm. I guess should be blamed for this one. I haven't tested GPIO
platform lookup in a while and this seems to have slipped in at some
point. :( I will send fixup patches to Linus for both issues, thanks
for pointing them out.

Alex.
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