linux-kernel - Re: [PATCH v2 06/10] soc: fsl: qe: Add support for QMC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230111164018.676a8ca1@bootlin.com>
Date:   Wed, 11 Jan 2023 16:40:18 +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 06/10] soc: fsl: qe: Add support for QMC

Hi Christophe,
On Wed, 11 Jan 2023 13:58:03 +0000
Christophe Leroy <christophe.leroy@...roup.eu> wrote:

> Le 06/01/2023 à 17:37, Herve Codina a écrit :
> > The QMC (QUICC Multichannel Controller) is available on some
> > PowerQUICC SoC such as the MPC885 or MPC866.  
> 
> Same, that's QMC for CPM for the time being, should that be made clear 
> in the subject ?

Also same answer:
Will changing the subject be enough or do I need to move it to new
created drivers/soc/fsl/cpm/ directory ?

> 
> QE also has QMC and this driver might be used for QE QMC as well with 
> some enhancement, maybe that could be explained here ?

Yes and we plan to have it working on QE too.

What do you think if I add the following:
  The QMC is also available on some Quicc Engine SoC.
  This current version support CPM1 SoC only. Some
  enhancement are needed to support Quicc Engine SoC.

> 
> I see you are using in_be16(), out_be16() etc ....
> That's specific to powerpc arch, maybe it is better to use ioread16be, 
> iowrite16be() etc ....
> See commit 3f39f38ea91d ("soc: fsl: qe: replace qe_io{read,write}* 
> wrappers by generic io{read,write}*") and commit 6ac9b61786cc ("soc: 
> fsl: qe: introduce qe_io{read,write}* wrappers") for information.

You're right.
I will switch to io{read,write}{16,32}be.

I prefer avoid the use of qe_* wrappers as the driver is not
(yet) compatible with QE.

> 
> > 
> > It emulates up to 64 channels within one serial controller
> > using the same TDM physical interface routed from the TSA.
> > 
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>  
> 
> In some places, you comments use the network style, not the generic style.

I will fix them.

> 
> Christophe

Thanks for the review,
Hervé

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