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Date:   Thu, 14 Dec 2023 14:49:41 +0200
From:   Ian Ray <ian.ray@gehealthcare.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Uwe Kleine-K??nig <u.kleine-koenig@pengutronix.de>,
        Sebastian Reichel <sebastian.reichel@collabora.com>,
        Rob Herring <robh@kernel.org>, linux-serial@vger.kernel.org,
        Jiri Slaby <jirislaby@kernel.org>,
        Fabio Estevam <festevam@gmail.com>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        linux-kernel@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        kernel@collabora.com, Shawn Guo <shawnguo@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>, devicetree@vger.kernel.org,
        nandor.han@gehealthcare.com
Subject: Re: EXT: Re: [PATCHv5 0/2] Fix imx53-ppd UART configuration
Message-ID: <ZXr55QV4tnCz8GtI@4600ffe2ac4f>
References: <20210430175038.103226-1-sebastian.reichel@collabora.com>
 <20231208090754.fn3bddlum3t7kakn@pengutronix.de>
 <2023120821-sandstone-lavender-7487@gregkh>
 <919dd7b3-aa86-4a2f-bcbe-7efa26831975@linaro.org>
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On Fri, Dec 08, 2023 at 01:14:50PM +0100, Krzysztof Kozlowski wrote:
> 
> On 08/12/2023 11:32, Greg Kroah-Hartman wrote:
> > On Fri, Dec 08, 2023 at 10:07:54AM +0100, Uwe Kleine-K??nig wrote:
> >> [Cc += dt maintainers]
> >>
> >> On Fri, Apr 30, 2021 at 07:50:36PM +0200, Sebastian Reichel wrote:
> > 
> > You are responding to a message from 2021???
> > 
> > I can't remember what I wrote in an email last week, let alone years
> > ago, are you sure any of this is relevant still?
> > 
> 
> Also, adding DT maintainers as Cc, does not magically allow us to
> understand the discussion. Please shortly summarize what do you
> need/expect from us.

This thread is indeed old, but we are remain interested in getting
this resolved.


The topic itself is about the tuning of DMA buffers for the i.MX53
platform.

DMA is required (for the 4M baud UART case), and a specific buffer
configuration is required, too.


Two approaches have been attempted:

"V4" sysfs
https://lore.kernel.org/lkml/20210305115058.92284-1-sebastian.reichel@collabora.com/

"V5" DT
https://lore.kernel.org/lkml/20210430175038.103226-1-sebastian.reichel@collabora.com/
(this thread)


Uwe recently commented to [1], and (hoping to avoid any further
confusion) let's continue in that thread.

[1] https://lore.kernel.org/lkml/20231208090205.ioc76sych3snjiwb@pengutronix.de/


> 
> Best regards,
> Krzysztof
> 
>