Re: [RFC] tty/serial/8250: use mctrl_gpio helpers

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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:
>> Hello Yegor,
>>
>> 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 don't know 8250 good enough to understand the problem here. Is MCR the
>> register to set the (output) handshake lines? Why do you need this?
>
> Save and restore, probably.
>
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux