linux-kernel - Re: [PATCH v1 08/29] dt-bindings: interconnect: tegra: Add initial IDs

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Message-ID: <20191119062535.GC2462695@ulmo>
Date:   Tue, 19 Nov 2019 07:25:35 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 08/29] dt-bindings: interconnect: tegra: Add initial
 IDs

On Mon, Nov 18, 2019 at 11:02:26PM +0300, Dmitry Osipenko wrote:
> Define interconnect IDs for memory controller (MC), external memory
> controller (EMC), external memory (EMEM) and memory clients of display
> controllers (DC).
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  include/dt-bindings/interconnect/tegra-icc.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>  create mode 100644 include/dt-bindings/interconnect/tegra-icc.h

There was a bit of discussion regarding this for a recent patch that I
was working on, see:

	http://patchwork.ozlabs.org/project/linux-tegra/list/?series=140318

I'd rather not use an additional set of definitions for this. The memory
controller already has a set of native IDs for memory clients that I
think we can reuse for this.

I've only added these client IDs for Tegra194 because that's where we
need it to actually describe a specific hardware quirk, but I can come
up with the equivalent for older chips as well.

Thierry

> diff --git a/include/dt-bindings/interconnect/tegra-icc.h b/include/dt-bindings/interconnect/tegra-icc.h
> new file mode 100644
> index 000000000000..e6b6a819434a
> --- /dev/null
> +++ b/include/dt-bindings/interconnect/tegra-icc.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef DT_BINDINGS_ICC_TEGRA_H
> +#define DT_BINDINGS_ICC_TEGRA_H
> +
> +#define TEGRA_ICC_EMC			0
> +#define TEGRA_ICC_EMEM			1
> +#define TEGRA_ICC_MC			2
> +#define TEGRA_ICC_MC_DC			3
> +#define TEGRA_ICC_MC_DCB		4
> +
> +#endif
> -- 
> 2.23.0
> 

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