[PATCH] gpio: mxs: implement get_direction callback

[Janusz Użycki]

W dniu 2014-11-17 o 18:00, Janusz Użycki pisze:
>
> W dniu 2014-11-17 o 09:28, Uwe Kleine-König pisze:
>> I think:
>>
>>     struct mctrl_gpios {
>>         struct uart_port *port;
>>         struct {
>>             gpio_desc *gpio;
>>             unsigned int irq;
>>         } mctrl_line[UART_GPIO_MAX];
>>     };
>>
>>     struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, 
>> unsigned int idx_if_needed);
>>     int mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
>>     int mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
>>     void mctrl_gpio_free(struct mctrl_gpios *gpios);
>
> 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

Just inline function?

best regards
Janusz