[PATCH v11 3/3] arm64: dts: Add mediatek SoC mt8195 and evaluation board

[Tinghan Shen]

Hi Matthias,

Thanks for your comment.

On Mon, 2022-03-28 at 14:26 +0200, Matthias Brugger wrote:
> 
> On 16/02/2022 12:31, Tinghan Shen wrote:
> > Add basic chip support for mediatek mt8195.
> > 
> > Signed-off-by: Seiya Wang <seiya.wang at mediatek.com>
> > Signed-off-by: Tinghan Shen <tinghan.shen at mediatek.com>
> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> > ---
> >   arch/arm64/boot/dts/mediatek/Makefile       |    1 +
> >   arch/arm64/boot/dts/mediatek/mt8195-evb.dts |  161 +++
> >   arch/arm64/boot/dts/mediatek/mt8195.dtsi    | 1049 +++++++++++++++++++
> >   3 files changed, 1211 insertions(+)
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8195-evb.dts
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> > index 8c1e18032f9f..5da29e7223e4 100644
> > --- a/arch/arm64/boot/dts/mediatek/Makefile
> > +++ b/arch/arm64/boot/dts/mediatek/Makefile
> > @@ -38,4 +38,5 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-krane-sku0.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-krane-sku176.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-pumpkin.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8192-evb.dtb
> > +dtb-$(CONFIG_ARCH_MEDIATEK) += mt8195-evb.dtb
> >   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8516-pumpkin.dtb
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8195-evb.dts b/arch/arm64/boot/dts/mediatek/mt8195-
> > evb.dts
> > new file mode 100644
> > index 000000000000..51633d91d984
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8195-evb.dts
> > @@ -0,0 +1,161 @@
> 
> [...]
> > +
> > +&u2port0 {
> > +	status = "okay";
> > +};
> > +
> > +&u2port1 {
> > +	status = "okay";
> > +};
> > +
> > +&u3phy0 {
> > +	status="okay";
> > +};
> > +
> > +&u3phy1 {
> > +	status="okay";
> > +};
> > +
> 
> So we enable phys for xhci but not the device. Are we missing anything to enable 
> them on the EVB?

after discussed with usb expert, we think that we're missing the xhci nodes.
I'll add xhci nodes at next version.

> 
> > +&uart0 {
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&uart0_pin>;
> > +	status = "okay";
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > new file mode 100644
> > index 000000000000..a363e82f6988
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > @@ -0,0 +1,1049 @@
> 
> [...]
> > +
> > +	clk32k: oscillator-32k {
> > +		compatible = "fixed-clock";
> > +		#clock-cells = <0>;
> > +		clock-frequency = <32768>;
> > +		clock-output-names = "clk32k";
> 
> I suppose the 32KHz oscillator is really present on the board also not used by 
> any device (up to now?).

Yes. 32KHz clock is still available on MT8195.
Some modules can choose 32K as clock source depending on requirements.

> 
> [...]
> > +
> > +	soc {
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +		compatible = "simple-bus";
> > +		ranges;
> > +
> 
> [...]
> > +
> > +		pwrap: pwrap at 10024000 {
> > +			compatible = "mediatek,mt8195-pwrap", "syscon";
> > +			reg = <0 0x10024000 0 0x1000>;
> > +			reg-names = "pwrap";
> > +			interrupts = <GIC_SPI 243 IRQ_TYPE_LEVEL_HIGH 0>;
> > +			clocks = <&infracfg_ao CLK_INFRA_AO_PMIC_AP>,
> > +				 <&infracfg_ao CLK_INFRA_AO_PMIC_TMR>;
> > +			clock-names = "spi", "wrap";
> 
> Binding mandates resets but not present here. It also mandates two register 
> regions, but only one is given here.

After discussed with pwrap experts, the pwrap binding is out-of-date for mt8195.
They will send a patch to fix pwrap binding.

> 
> > +			assigned-clocks = <&topckgen CLK_TOP_PWRAP_ULPOSC>;
> > +			assigned-clock-parents = <&topckgen CLK_TOP_ULPOSC1_D10>;
> > +		};
> > +
> > +		scp_adsp: clock-controller at 10720000 {
> > +			compatible = "mediatek,mt8195-scp_adsp";
> > +			reg = <0 0x10720000 0 0x1000>;
> > +			#clock-cells = <1>;
> > +		};
> > +
> 
> [...]
> 
> > +
> > +		mmc0: mmc at 11230000 {
> > +			compatible = "mediatek,mt8195-mmc",
> > +				     "mediatek,mt8183-mmc";
> > +			reg = <0 0x11230000 0 0x10000>,
> > +			      <0 0x11f50000 0 0x1000>;
> 
> Seems to be an oversight when adding support for mt8183-mmc support to the 
> driver. The binding description is missing the optional host top register base. 
> Chaotian can you please help to fix this in the binding description.

Ok. I'll fix it at next version.

> 
> > +			interrupts = <GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH 0>;
> > +			clocks = <&topckgen CLK_TOP_MSDC50_0>,
> > +				 <&infracfg_ao CLK_INFRA_AO_MSDC0>,
> > +				 <&infracfg_ao CLK_INFRA_AO_MSDC0_SRC>;
> > +			clock-names = "source", "hclk", "source_cg";
> > +			status = "disabled";
> > +		};
> > +
> 
> [...]
> > +
> > +		xhci3: usb at 112b0000 {
> > +			compatible = "mediatek,mt8195-xhci",
> > +				     "mediatek,mtk-xhci";
> > +			reg = <0 0x112b0000 0 0x1000>,
> > +			      <0 0x112b3e00 0 0x0100>;
> > +			reg-names = "mac", "ippc";
> > +			interrupts = <GIC_SPI 536 IRQ_TYPE_LEVEL_HIGH 0>;
> > +			phys = <&u2port3 PHY_TYPE_USB2>;
> > +			assigned-clocks = <&topckgen CLK_TOP_USB_TOP_3P>,
> > +					  <&topckgen CLK_TOP_SSUSB_XHCI_3P>;
> > +			assigned-clock-parents = <&topckgen CLK_TOP_UNIVPLL_D5_D4>,
> > +						 <&topckgen CLK_TOP_UNIVPLL_D5_D4>;
> > +			clocks = <&pericfg_ao CLK_PERI_AO_SSUSB_3P_BUS>,
> > +				 <&topckgen CLK_TOP_SSUSB_P3_REF>,
> > +				 <&pericfg_ao CLK_PERI_AO_SSUSB_3P_XHCI>;
> > +			clock-names = "sys_ck", "ref_ck", "xhci_ck";
> > +			/* This controller is connected with a BT device.
> > +			 * Disable usb2 lpm to prevent konwn issues.
> > +			 */
> > +			usb2-lpm-disable;
> 
> My understanding is, that this depends on the board and not the SoC. Which means 
> usb2-lpm-disable should go into any board that has a BT device connected to the 
> xhci device (I don't see any active xhci node in mt8195-evb so far).

Ok. I'll move this property to evb board in a xhci node.

Best regards,
TingHan

> 
> Regards,
> Matthias