From mboxrd@z Thu Jan  1 00:00:00 1970
From: jernej.skrabec@siol.net (Jernej =?utf-8?B?xaBrcmFiZWM=?=)
Date: Wed, 21 Mar 2018 18:13:42 +0100
Subject: [linux-sunxi] Re: [PATCH 2/7] dt-bindings: add binding for the
 Allwinner A64 DE2 bus
In-Reply-To: <AAC74653-C6EB-4BE3-BB19-210687C1E158@aosc.io>
References: <20180316175354.21437-1-icenowy@aosc.io>
 <20180320184646.dynqv6qubzabroe4@flea>
 <AAC74653-C6EB-4BE3-BB19-210687C1E158@aosc.io>
Message-ID: <2866474.lRHIcLtROC@jernej-laptop>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi all,

Dne sreda, 21. marec 2018 ob 03:18:13 CET je Icenowy Zheng napisal(a):
> ? 2018?3?21? GMT+08:00 ??2:46:46, Maxime Ripard <maxime.ripard@bootlin.com> 
??:
> >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