linux-kernel - Re: [PATCH v1 04/10] ARM: tegra: Add reg property to Tegra20 EMC table device-tree nodes

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Message-ID: <YLSpCXNtut3z8U9a@orome.fritz.box>
Date:   Mon, 31 May 2021 11:14:49 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Agneli <poczt@...tonmail.ch>, Paul Fertser <fercerpav@...il.com>,
        Svyatoslav Ryhel <clamor95@...il.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 04/10] ARM: tegra: Add reg property to Tegra20 EMC
 table device-tree nodes

On Mon, May 10, 2021 at 11:25:54PM +0300, Dmitry Osipenko wrote:
> The reg property is now specified for the emc-tables nodes in the Tegra20
> device-tree binding. Add reg property to the EMC table device-tree nodes
> of Tegra20 board device-trees in order to silence dt_binding_check warning
> about the missing property.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  arch/arm/boot/dts/tegra20-acer-a500-picasso.dts | 4 ++++
>  arch/arm/boot/dts/tegra20-paz00.dts             | 1 +
>  2 files changed, 5 insertions(+)

In retrospect we should've just used "reg" in the first place rather
than adding the custom "nvidia,ram-code". It's a bit redundant to have
both of them with the same value. I wonder if we should deprecate the
use of "nvidia,ram-code" and at least make the code look at the "reg"
property first and only fall back to "nvidia,ram-code" if "reg" does
not exist. We probably won't ever be able to get rid of the fallback
for backwards-compatibility reasons, but at least that would make the
intent a bit clearer.

Thierry

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