linux-kernel - Re: [PATCH v2] gpio: make of_get_named_gpiod

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Date:	Mon, 19 May 2014 15:28:23 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gpio: make of_get_named_gpiod_flags() private

On Sat, May 17, 2014 at 02:54:50PM +0900, Alexandre Courbot wrote:
> of_get_named_gpiod_flags() is visible and directly usable by GPIO
> consumers, but it really should not as the gpiod interface relies
> on the simpler gpiod_get() to provide properly-configured GPIOs.
> 
> of_get_named_gpiod_flags() is just used internally by gpiolib to
> implement gpiod_get(), and by the old of_get_named_gpio_flags()
> function, therefore it makes sense to make it gpiolib-private.
> 
> As a side-effect, the unused (and unneeded) of_get_gpiod_flags()
> inline function is also removed, and of_get_named_gpio_flags() is moved
> from a static inline function to a regular one in gpiolib-of.c
> 
> This results in all references to gpiod_* functions in of_gpio.h being
> gone, which is the way it should be since this file is part of the old
> integer GPIO interface.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
> Changes since v1:
> - Fixed compilation error when CONFIG_OF_GPIO is not defined
> - Fixed warning due to of_gpio_flags enum not being declared
>   in private gpiolib.h header
> 
>  drivers/gpio/gpiolib-of.c | 14 ++++++++++++++
>  drivers/gpio/gpiolib.h    |  5 +++++
>  include/linux/of_gpio.h   | 35 +++--------------------------------
>  3 files changed, 22 insertions(+), 32 deletions(-)

There are cases where GPIOs need to be obtained from device tree nodes
without a corresponding struct device. Do you have any ideas on how to
support such use-cases?

There's currently no API to do that except of_get_named_gpio_flags().
But that doesn't handled flags automatically in a way that gpiod_get()
does.

Thierry

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