linux-kernel - Re: [PATCH 1/8] serial: core: only get RS485 termination gpio if supported

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Message-ID: <YrNLtg+BZlwKsBbF@smile.fi.intel.com>
Date:   Wed, 22 Jun 2022 20:04:54 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Lino Sanfilippo <LinoSanfilippo@....de>
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        ilpo.jarvinen@...ux.intel.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, vz@...ia.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        lukas@...ner.de, p.rosenberger@...bus.com,
        Lino Sanfilippo <l.sanfilippo@...bus.com>
Subject: Re: [PATCH 1/8] serial: core: only get RS485 termination gpio if
 supported

On Wed, Jun 22, 2022 at 05:46:52PM +0200, Lino Sanfilippo wrote:
> From: Lino Sanfilippo <l.sanfilippo@...bus.com>
> 
> In uart_get_rs485_mode() only try to get a termination GPIO if RS485 bus
> termination is supported by the driver.

I'm not sure I got the usefulness of this change.
We request GPIO line as optional, so if one is defined it in the DT/ACPI, then
they probably want to (opportunistically) have it.

The certain driver may or may not utilize this GPIO.

With your change it's possible to have a DTS where GPIO line defined in a
broken way and user won't ever know about it, if they are using platforms
without termination support.

-- 
With Best Regards,
Andy Shevchenko