linux-kernel - Re: [PATCH v4 3/3] remoteproc: zynqmp: get TCM from device-tree

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Message-ID: <9259e3f3-8e17-40da-a0e1-3f95b0879ba1@amd.com>
Date:   Wed, 6 Sep 2023 09:21:51 -0500
From:   Tanmay Shah <tanmay.shah@....com>
To:     Philippe Mathieu-Daudé <philmd@...aro.org>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michal Simek <michal.simek@....com>
Cc:     Conor Dooley <conor+dt@...nel.org>,
        Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
        Ben Levinsky <ben.levinsky@....com>
Subject: Re: [PATCH v4 3/3] remoteproc: zynqmp: get TCM from device-tree


On 9/6/23 1:20 AM, Philippe Mathieu-Daudé wrote:
> On 5/9/23 23:48, Tanmay Shah wrote:
> > 
> > On 9/4/23 2:50 AM, Philippe Mathieu-Daudé wrote:
> >> Hi,
> >>
> >> On 29/8/23 20:19, Tanmay Shah wrote:
> >>> Use new dt bindings to get TCM address and size
> >>> information. Also make sure that driver stays
> >>> compatible with previous device-tree bindings.
> >>> So, if TCM information isn't available in device-tree
> >>> for zynqmp platform, hard-coded address of TCM will
> >>> be used.
> >>>
> >>> New platforms that are compatible with this
> >>> driver must add TCM support in device-tree as per new
> >>> bindings.
> >>>
> >>> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> >>> ---
> >>>    drivers/remoteproc/xlnx_r5_remoteproc.c | 279 +++++++++++++++++++-----
> >>>    1 file changed, 221 insertions(+), 58 deletions(-)
> >>
> >>
> >>>    /**
> >>> @@ -75,11 +79,17 @@ struct mbox_info {
> >>>     * Hardcoded TCM bank values. This will be removed once TCM bindings are
> >>>     * accepted for system-dt specifications and upstreamed in linux kernel
> >>
> >> Just curious, for how long this fall back code has to be maintained?
> >> (When/how will we know we can remove it?)
> > 
> > 
> > I believe we should never remove it. It's important that driver works with old bindings as well.
>
> Do you mind posting a followup patch updating the comment,
> to clarify?


Sure I will post the follow up patch with comments updated.

I will wait for reviews from Mathieu on driver's patch then will address all the comments in v5.


>
> Thanks,
>
> Phil.