Hi Matthias,
On Thu, 2016-08-11 at 17:44 +0200, Matthias Brugger wrote:
>
> On 10/08/16 16:48, Tiffany Lin wrote:
> > Add video decoder node for MT8173
> >
> > Signed-off-by: Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
> > ---
> > arch/arm64/boot/dts/mediatek/mt8173.dtsi | 44 ++++++++++++++++++++++++++++++
> > 1 file changed, 44 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > index 10f638f..2872cd7 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > @@ -974,6 +974,50 @@
> > #clock-cells = <1>;
> > };
> >
> > + vcodec_dec: vcodec@16000000 {
> > + compatible = "mediatek,mt8173-vcodec-dec";
> > + reg = <0 0x16000000 0 0x100>, /* VDEC_SYS */
> > + <0 0x16020000 0 0x1000>, /* VDEC_MISC */
> > + <0 0x16021000 0 0x800>, /* VDEC_LD */
> > + <0 0x16021800 0 0x800>, /* VDEC_TOP */
> > + <0 0x16022000 0 0x1000>, /* VDEC_CM */
> > + <0 0x16023000 0 0x1000>, /* VDEC_AD */
> > + <0 0x16024000 0 0x1000>, /* VDEC_AV */
> > + <0 0x16025000 0 0x1000>, /* VDEC_PP */
> > + <0 0x16026800 0 0x800>, /* VDEC_HWD */
> > + <0 0x16027000 0 0x800>, /* VDEC_HWQ */
> > + <0 0x16027800 0 0x800>, /* VDEC_HWB */
> > + <0 0x16028400 0 0x400>; /* VDEC_HWG */
> > + interrupts = <GIC_SPI 204 IRQ_TYPE_LEVEL_LOW>;
> > + mediatek,larb = <&larb1>;
> > + iommus = <&iommu M4U_PORT_HW_VDEC_MC_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_PP_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_AVC_MV_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_PRED_RD_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_PRED_WR_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_UFO_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_VLD_EXT>,
> > + <&iommu M4U_PORT_HW_VDEC_VLD2_EXT>;
> > + mediatek,vpu = <&vpu>;
> > + power-domains = <&scpsys MT8173_POWER_DOMAIN_VDEC>;
> > + clocks = <&apmixedsys CLK_APMIXED_VCODECPLL>,
> > + <&topckgen CLK_TOP_UNIVPLL_D2>,
> > + <&topckgen CLK_TOP_CCI400_SEL>,
> > + <&topckgen CLK_TOP_VDEC_SEL>,
> > + <&topckgen CLK_TOP_VCODECPLL>,
> > + <&apmixedsys CLK_APMIXED_VENCPLL>,
> > + <&topckgen CLK_TOP_VENC_LT_SEL>,
> > + <&topckgen CLK_TOP_VCODECPLL_370P5>;
> > + clock-names = "vcodecpll",
> > + "univpll_d2",
> > + "clk_cci400_sel",
> > + "vdec_sel",
> > + "vdecpll",
> > + "vencpll",
> > + "venc_lt_sel",
> > + "vdec_bus_clk_src";
> > + };
> > +
>
> Shouldn't we set here:
> status = "disabled";
>
> To save power on headless systems?
>
We only power on when there is at least one decode instance created.
In this case, do we need "status = "disabled";" here?
I see some other device nodes in dtsi do not add this.
Sorry, I am just confused when should we add status for device node.
best regards,
Tiffany
> Regards,
> Matthias
>
> > larb1: larb@16010000 {
> > compatible = "mediatek,mt8173-smi-larb";
> > reg = <0 0x16010000 0 0x1000>;
> >
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