On Sat, Mar 12, 2016 at 12:22 PM, Uwe Kleine-König
<u.kleine-koenig@xxxxxxxxxxxxxx> wrote:
> Hello Yegor,
>
> On Fri, Mar 11, 2016 at 10:30:14PM +0100, Yegor Yefremov wrote:
>> On Fri, Mar 11, 2016 at 5:26 PM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote:
>> > On 03/11/2016 08:19 AM, Uwe Kleine-König wrote:
>> >> On Fri, Mar 11, 2016 at 05:06:30PM +0100, Yegor Yefremov wrote:
>> >>> On Thu, Mar 10, 2016 at 8:55 PM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote:
>> >>>> On 03/10/2016 08:36 AM, Peter Hurley wrote:
>> >>>>> Rather, transform
>> >>>>>
>> >>>>> serial_out(port, UART_MCR, val);
>> >>>>> serial_port_out(up, UART_MCR, val);
>> >>>>>
>> >>>>> to
>> >>>>>
>> >>>>> serial8250_out_MCR(up, val);
>> >>>>>
>> >>>>> and add the gpio setting to that.
>> >>>>> Do the transform first in a prequel patch; then add gpio to that.
>> >>>>>
>> >>>>> Similarly for serial_in(port, UART_MCR)
>> >>>
>> >>> To implement serial8250_in_MCR() we will need something like
>> >>> mctrl_gpio_get_mcr(), because mctrl_gpio_get() returns only GPIO
>> >>> values in input mode. Peter, Uwe what do you think about it?
>> >
>> > mctrl_gpio_read() ?
>>
>> What about renaming the functions to reflect their actual meaning?
>>
>> mctrl_gpio_get_mcr()
>> mctrl_gpio_set_mcr()
>> mctrl_gpio_get_msr()
>
> I think this is only understandable, if you have 8250 in mind where (I
> guess) the registers to set and read the handshaking lines are called
> mcr and msr.
>
> So I don't think this is a good idea.
What is the best way to check, if for example RTS is implemented via
GPIO? Following code fails to compile:
drivers/tty/serial/8250/8250_omap.c: In function ‘omap8250_set_mctrl’:
drivers/tty/serial/8250/8250_omap.c:131:15: error: dereferencing
pointer to incomplete type
if (up->gpios->gpio[TIOCM_RTS]) {
Should I move
struct mctrl_gpios {
struct uart_port *port;
struct gpio_desc *gpio[UART_GPIO_MAX];
int irq[UART_GPIO_MAX];
unsigned int mctrl_prev;
bool mctrl_on;
};
to serial_mctrl_gpio.h or should I create some routine, that tells me,
if given signal is GPIO or not?
Yegor
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