[PATCH v5 2/6] serial: 8250: Support separate rs485 rx-enable GPIO

[Lino Sanfilippo]

Hi,

On 26.01.24 18:27, Farouk Bouabid wrote:
> From: Heiko Stuebner <heiko.stuebner at cherry.de>
>
> The RE signal is used to control the duplex mode of transmissions,
> aka receiving data while sending in full duplex mode, while stopping
> receiving data in half-duplex mode.
>
> On a number of boards the !RE signal is tied to ground so reception
> is always enabled except if the UART allows disabling the receiver.
> This can be taken advantage of to implement half-duplex mode - like
> done on 8250_bcm2835aux.
>
> Another solution is to tie !RE to RTS always forcing half-duplex mode.
>
> And finally there is the option to control the RE signal separately,
> like done here by introducing a new rs485-specific gpio that can be
> set depending on the RX_DURING_TX setting in the common em485 callbacks.
>

we just added the rx_during_tx_gpio to the serial core.
Why cant you use this GPIO for your purpose?

Regards,
Lino