linux-kernel - Re: [PATCH v3 3/5] arm64: dts: rockchip: Enable HDMI output on RK3368-Lion-Haikou

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Message-ID: <d487d1c4-a21e-4d6f-bc01-5797eb449c57@rock-chips.com>
Date: Thu, 15 Jan 2026 19:05:58 +0800
From: Chaoyi Chen <chaoyi.chen@...k-chips.com>
To: Heiko Stübner <heiko@...ech.de>
Cc: quentin.schulz@...rry.de, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Heiko Stuebner <heiko.stuebner@...rry.de>
Subject: Re: [PATCH v3 3/5] arm64: dts: rockchip: Enable HDMI output on
 RK3368-Lion-Haikou

On 1/15/2026 5:35 PM, Heiko Stübner wrote:
> Hi,
> 
> Am Donnerstag, 15. Januar 2026, 02:25:34 Mitteleuropäische Normalzeit schrieb Chaoyi Chen:
>> On 1/15/2026 7:07 AM, Heiko Stuebner wrote:
>>> From: Heiko Stuebner <heiko.stuebner@...rry.de>
>>>
>>> Enable the VOP and HDMI controller on the Lion-Haikou board.
>>>
>>> Signed-off-by: Heiko Stuebner <heiko.stuebner@...rry.de>
>>> ---
>>>  .../boot/dts/rockchip/rk3368-lion-haikou.dts     | 16 ++++++++++++++++
>>>  arch/arm64/boot/dts/rockchip/rk3368-lion.dtsi    |  5 +++++
>>>  2 files changed, 21 insertions(+)
>>>
>>
>> I guess NPLL is an independent PLL available for VOP, 
>> could you give it a try?
> 
> not really sure what you mean here.
> 
> The VOP-binding specifies the aclk, dclk and hclk clocks.
> 
> The NPLL is a possible source for quite a lot of peripherals on the rk3368
> aclk_cci_pre,  sclk_tcp, vepu/vdpu, hevc, isp, gpu, gmac
> 
> So it's definitly not dedicated to the VOP, and thus should not
> change frequency for the VOP alone, because that could affect
> other blocks.
> 
> 
> Heiko

Oh, you are right. It is a general purpose PLL.

-- 
Best, 
Chaoyi