linux-kernel - Re: [linux-sunxi] [PATCH 14/15] ARM: dts: sun8i: h3: Enable HDMI output on H3 boards

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Date:   Sun, 25 Feb 2018 17:08:50 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     julian.calaby@...il.com, Julian Calaby <julian.calaby@...il.com>
CC:     "Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>,
        jernej.skrabec@...l.net, Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Michael Turquette <mturquette@...libre.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>, sboyd@...nel.org,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH 14/15] ARM: dts: sun8i: h3: Enable HDMI output on H3 boards



于 2018年2月25日 GMT+08:00 下午5:06:32, Julian Calaby <julian.calaby@...il.com> 写到:
>Hi Icenowy,
>
>On Sun, Feb 25, 2018 at 7:43 PM, Icenowy Zheng <icenowy@...c.io> wrote:
>>
>>
>> 于 2018年2月25日 GMT+08:00 下午4:11:34, Julian Calaby
><julian.calaby@...il.com> 写到:
>>>Hi Jernej,
>>>
>>>On Sun, Feb 25, 2018 at 8:45 AM, Jernej Skrabec
>>><jernej.skrabec@...l.net> wrote:
>>>> Enable HDMI output on all boards which have HDMI connector.
>>>>
>>>> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
>>>> ---
>>>>  arch/arm/boot/dts/sun8i-h3-bananapi-m2-plus.dts    | 25
>>>++++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-beelink-x2.dts          | 25
>>>++++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-libretech-all-h3-cc.dts | 25
>>>++++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-nanopi-m1.dts           | 25
>>>++++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-orangepi-2.dts          | 25
>>>++++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-orangepi-lite.dts       | 25
>>>++++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-orangepi-one.dts        | 24
>>>+++++++++++++++++++++
>>>>  arch/arm/boot/dts/sun8i-h3-orangepi-pc.dts         | 25
>>>++++++++++++++++++++++
>>>>  8 files changed, 199 insertions(+)
>>>
>>>As I understand it, the H2+ is just a slightly trimmed down H3. In
>>>terms of HDMI support, the difference is that the H2+ can't output
>4k.
>>
>> H2+ can OUTPUT 4K. The BSP restricts it to DECODE 4K. (And mainline
>won't have such restriction)
>
>Interesting!
>
>I'm getting my data from here: http://linux-sunxi.org/H3#Variants
>
>So essentially what you're saying is that the H2+ is just a H3 with
>less pins? (I'm assuming the "lack of gigabit mac" is effectively it
>not having the required pins, i.e. GPIO bank D)

No it's just downspec and BSP decode code restricts 4K
decode (by reserving less memory).

Just similar to STM32F103C8T6, which has a spec of 64KiB Flash, but with in fact 128KiB usable.

For GbE with H2+, it's verified by Banana Pi.

>
>Thanks,