linux-kernel - Re: [PATCH RFC 0/2] Introduce PRU UART driver

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Message-ID: <ba88a5c0-a8b8-4e48-9752-76881fa8e94e@ti.com>
Date: Wed, 7 May 2025 11:31:27 -0500
From: Judith Mendez <jm@...com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kevin Hilman
	<khilman@...libre.com>,
        Jiri Slaby <jirislaby@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, Hari Nagalla
	<hnagalla@...com>
Subject: Re: [PATCH RFC 0/2] Introduce PRU UART driver

Hi Andy,

On 5/2/25 4:38 AM, Andy Shevchenko wrote:
> On Wed, Apr 30, 2025 at 07:31:11PM -0500, Judith Mendez wrote:
>> This patch series is sent as an RFC to get some initial comments
>> on the PRU UART driver.
>>
>> The ICSSM modules on am64x SoC and the PRUSS module on am62 SoC or am335x
>> SoCs have a UART sub-module. This patch series introduces the driver and the
>> corresponding binding documentation for this sub-module.
>>
>> The DTS patches for adding PRU nodes and enabling PRU UART will be added
>> in a later v1 version of the series if accepted.
>>
>> This driver has been previously tested on the following boards:
>> am64x SK, am62x SK, and am335x SK boards.
> 
> The first and main question here: Have you checked the existing zillion of
> drivers and become with an idea that none of them not even close to this one
> (based on RTL)?
> 

Thanks for reviewing.

I have looked through the drivers in tty/serial/8250 and I believe there
are no drivers we could leverage, especially since this driver has a
dependency on the PRU drivers for clock and power. This PORT_16550A UART
is in PRU module which is specific to TI, so besides simplifying the
driver a bit further, I don't think we can use another driver.

~ Judith