linux-kernel - Re: [PATCH 3/7] bus: add bus driver for accessing Allwinner A64 DE2

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Message-ID: <CAMty3ZAfBZSc9f5mRxSaYzW6W1JkVkJ7+swMAm3Gg_EFWUkULw@mail.gmail.com>
Date:   Sat, 14 Apr 2018 16:16:38 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Icenowy Zheng <icenowy@...c.io>, Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 3/7] bus: add bus driver for accessing Allwinner A64 DE2

On Sat, Apr 14, 2018 at 4:00 PM, Chen-Yu Tsai <wens@...e.org> wrote:
> On Sat, Apr 14, 2018 at 6:25 PM, Jagan Teki <jagan@...rulasolutions.com> wrote:
>> On Fri, Mar 16, 2018 at 11:23 PM, Icenowy Zheng <icenowy@...c.io> wrote:
>>> The "Display Engine 2.0" (usually called DE2) on the Allwinner A64 SoC
>>> is different from the ones on other Allwinner SoCs. It requires a SRAM
>>> region to be claimed, otherwise all DE2 subblocks won't be accessible.
>>>
>>> Add a bus driver for the Allwinner A64 DE2 part which claims the SRAM
>>> region when probing.
>>
>> Along with this bus driver, we also need
>> drivers/gpu/drm/sun4i/sun4i_drv.c which can usually drive the
>> pipelines like mixer0 and 1 are the cases for A64?
>
> I imagine that's the next part to be sent out, after the hardware
> representation in the device tree has been decided on.

Yeah, this hardware representation along with separate bus driver
going like in another direction especially if we add pipelines support
to it, may be we can add sram stuff to platdata of existinf
sun4i_drv.c

Jagan.

-- 
Jagan Teki
Senior Linux Kernel Engineer | Amarula Solutions
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.