linux-kernel - Re: [linux-sunxi] Re: [PATCH 2/7] dt-bindings: add binding for the Allwinner A64 DE2 bus

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Message-ID: <2866474.lRHIcLtROC@jernej-laptop>
Date:   Wed, 21 Mar 2018 18:13:42 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     linux-sunxi@...glegroups.com, icenowy@...c.io
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH 2/7] dt-bindings: add binding for the Allwinner A64 DE2 bus

Hi all,

Dne sreda, 21. marec 2018 ob 03:18:13 CET je Icenowy Zheng napisal(a):
> 于 2018年3月21日 GMT+08:00 上午2:46:46, Maxime Ripard <maxime.ripard@...tlin.com> 
写到:
> >On Sat, Mar 17, 2018 at 01:53:49AM +0800, Icenowy Zheng wrote:
> >> All the sub-blocks of Allwinner A64 DE2 needs the SRAM C on A64 SoC
> >
> >to
> >
> >> be claimed, otherwise the whole DE2 space is inaccessible.
> >> 
> >> Add a device tree binding of the DE2 part as a sub-bus.
> >
> >Where did you get the info that it was a bus?
> 
> There's no direct evidence, just some guess.
> 
> The DE2 is a whole part that is just allocated a memory
> space at the user manual, and the SRAM controls the
> access to all modules in the DE2.
> 
> So it might be a bus.
> 
> Implement it as a bus is a clear representation on A64.

Since there is already syscon for same mmio region, we migh as well use it 
when loading ccu-sun8i-de2 driver on A64.

Other options, like SRAM driver or bus driver, might better represent HW, but 
then we would have two DT nodes covering same mmio region, which I think is 
not really acceptable.

Any suggestions?

BTW, H6 has same design in this regard.

Best regards,
Jernej