linux-kernel - Re: [PATCH v2 02/10] soc: fsl: qe: Add support for TSA

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Date:   Wed, 11 Jan 2023 16:06:51 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Li Yang <leoyang.li@....com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Qiang Zhao <qiang.zhao@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 02/10] soc: fsl: qe: Add support for TSA

Hi Christophe,

On Wed, 11 Jan 2023 13:47:23 +0000
Christophe Leroy <christophe.leroy@...roup.eu> wrote:

> Le 06/01/2023 à 17:37, Herve Codina a écrit :
> > The TSA (Time Slot Assigner) is available in some
> > PowerQUICC SoC such as the MPC885 or MPC866.
> > 
> > Its purpose is to route some TDM time-slots to other
> > internal serial controllers.  
> 
> Is the subject correct ? As far as I understand this patch adds support 
> for the TSA on the CPM (exactly on CPM1), not on the QE.

Yes exactly, it is a CPM1 support (kind of previous version of QE).

Do you think that fixing the subject is enough or do I need also
to create a new directory drivers/soc/fsl/cpm/ and move these drivers
(TSA and QMC) in this new directory.

The alternative could be to leave this driver in drivers/soc/qe/ and
rename it to cpm-tsa.c.

For information, we have some plan to have this driver working
with QE (not done yet).

> 
> By the way, there are already some embryo for handling TSA on QE in 
> drivers/soc/fsl/qe/qe-tdm.c

Yes but this can be seen as an extension only used by 
drivers/net/wan/fsl_ucc_hdlc.c and it supports QE only.

Not sure that qe-tdm.c will fit well if several other
drivers instances use it.

> 
> > 
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>  
> 
> Christophe

Thanks for the review,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com