[PATCH 3/4] arm64: dts: rockchip: Add HDMI1 PHY PLL clock source to VOP2 on RK3588

[Heiko Stübner]

Am Montag, 17. Februar 2025, 03:44:37 MEZ schrieb Jianfeng Liu:
> Hi Cristian,
> 
> On Sat, 15 Feb 2025 02:55:39 +0200, Cristian Ciocaltea wrote:
> >The HDMI1 PHY PLL clock source cannot be added directly to vop node in
> >rk3588-base.dtsi, along with the HDMI0 related one, because HDMI1 is an
> >optional feature and its PHY node belongs to a separate (extra) DT file.
> >
> >Therefore, add the HDMI1 PHY PLL clock source to VOP2 by overwriting its
> >clocks & clock-names properties in the extra DT file.
> 
> There are boards that only use hdmi1 such as ROCK 5 ITX. So there are two
> choices for this board:
> 
> 1, Enable hdptxphy0 as dependency of vop although it is not really used.
> 
> 2, Overwrite vop node at board dts to make it only use hdptxphy1 like:
> 
> &vop {
> 	clocks = <&cru ACLK_VOP>,
> 		 <&cru HCLK_VOP>,
> 		 <&cru DCLK_VOP0>,
> 		 <&cru DCLK_VOP1>,
> 		 <&cru DCLK_VOP2>,
> 		 <&cru DCLK_VOP3>,
> 		 <&cru PCLK_VOP_ROOT>,
> 		 <&hdptxphy1>;
> 	clock-names = "aclk",
> 		      "hclk",
> 		      "dclk_vp0",
> 		      "dclk_vp1",
> 		      "dclk_vp2",
> 		      "dclk_vp3",
> 		      "pclk_vop",
> 		      "pll_hdmiphy1";
> };
> 
> What do you think of these two method?

Going by the code in patch1 (+drm-misc) we have:
  vop2->pll_hdmiphy0 = devm_clk_get_optional(vop2->dev, "pll_hdmiphy0");
+
  vop2->pll_hdmiphy1 = devm_clk_get_optional(vop2->dev, "pll_hdmiphy1");

So the clock-reference to hdptxphy0 should just result in vop2->pll_hdmiphy0
being NULL and thus ignored further on?