[PATCH] gpio: mxs: implement get_direction callback

[Uwe Kleine-König]

Hello Janusz,

On Mon, Nov 17, 2014 at 06:07:53PM +0100, Janusz Użycki wrote:
> >It looks there could be one more helper useful.
> >Both atmel_serial.c and mxs-auart.c checks if the line is
> >supported by mctrl_gpio.
> >One time it is eg.:
> >(s->gpio_irq[UART_GPIO_DCD] > 0)
> >another time it is eg.:
> >IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(s->gpios, UART_GPIO_RTS))
> >
> >The first one is no possible now. The second seems rude.
> >bool mctrl_gpio_is_gpio((struct mctrl_gpios *gpios, enum
> >mctrl_gpio_idx gidx);
> >The name is hard. Moreover the implementation could be very similar
> >to mctrl_gpio_to_gpiod(). Any ideas?
> 
> The differences:
> - faster
> - not exported
> - used mainly in uart's interrupt
> - assumes that struct mctrl_gpios *gpios exists
I wonder why you need it at all?!

Best regards
Uwe

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