linux-kernel - Re: [PATCH 2/8] serial: core, 8250: set RS485 termination gpio in serial core

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Date:   Thu, 23 Jun 2022 04:03:42 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
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 2/8] serial: core, 8250: set RS485 termination gpio in
 serial core

On 22.06.22 at 19:06, Andy Shevchenko wrote:
> On Wed, Jun 22, 2022 at 05:46:53PM +0200, Lino Sanfilippo wrote:
>> From: Lino Sanfilippo <l.sanfilippo@...bus.com>
>>
>> In serial8250_em485_config() the termination GPIO is set with the uart_port
>> spinlock held. This is an issue if setting the GPIO line can sleep (e.g.
>> since the concerning GPIO expander is connected via SPI or I2C).
>>
>> Fix this by setting the termination line outside of the uart_port spinlock
>> in the serial core.
>
> This doesn't describe that this patch is actually changing GPIO to support
> sleep mode. So, it doesn't fix anything. Please rephrase the commit message
> accordingly.

Good point, I will adjust the commit message in the next version.

>> This also makes setting the termination GPIO generic for all uart drivers.
>
> UART
>

Right, upper letters should be used.

Thanks a lot for the review!

Regards,
Lino