linux-kernel - Re: [PATCH v12 1/1] arm64: dts: Add MediaTek MT8186 dts and evaluation board and Makefile

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Date:   Mon, 1 Aug 2022 18:01:36 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        Chen-Yu Tsai <wenst@...omium.org>, hsinyi@...omium.org
Subject: Re: [PATCH v12 1/1] arm64: dts: Add MediaTek MT8186 dts and
 evaluation board and Makefile

Hi Allen,

On Mon, Aug 01, 2022 at 08:39:52PM +0800, Allen-KH Cheng wrote:
> Add basic chip support for MediaTek MT8186.
> 
> Signed-off-by: Allen-KH Cheng <Allen-KH.Cheng@...iatek.com>
> ---
>  arch/arm64/boot/dts/mediatek/Makefile       |   1 +
>  arch/arm64/boot/dts/mediatek/mt8186-evb.dts | 238 ++++++
>  arch/arm64/boot/dts/mediatek/mt8186.dtsi    | 874 ++++++++++++++++++++
>  3 files changed, 1113 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/mediatek/mt8186-evb.dts
>  create mode 100644 arch/arm64/boot/dts/mediatek/mt8186.dtsi
> 
[..]
> diff --git a/arch/arm64/boot/dts/mediatek/mt8186-evb.dts b/arch/arm64/boot/dts/mediatek/mt8186-evb.dts
> new file mode 100644
> index 000000000000..7d4a64ab95e4
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt8186-evb.dts
[..]
> +&pio {
> +	i2c0_pins: i2c0-default-pins {
> +		pins-bus {
> +			pinmux = <PINMUX_GPIO128__FUNC_SDA0>,
> +				 <PINMUX_GPIO127__FUNC_SCL0>;
> +			bias-disable;
> +			drive-strength-microamp = <1000>;
> +			drive-strength = <4>;

You can't use both drive-strength-microamp and drive-strength. You only want the
microamp one here (and for the others below), since these are i2c pins.

> +			input-enable;
> +		};
> +	};
[..]
> diff --git a/arch/arm64/boot/dts/mediatek/mt8186.dtsi b/arch/arm64/boot/dts/mediatek/mt8186.dtsi
> new file mode 100644
> index 000000000000..38f9466eea42
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt8186.dtsi
> @@ -0,0 +1,874 @@
[..]
> +		pio: pinctrl@...05000 {
> +			compatible = "mediatek,mt8186-pinctrl";
> +			reg = <0 0x10005000 0 0x1000>,
> +			      <0 0x10002000 0 0x0200>,
> +			      <0 0x10002200 0 0x0200>,
> +			      <0 0x10002400 0 0x0200>,
> +			      <0 0x10002600 0 0x0200>,
> +			      <0 0x10002A00 0 0x0200>,
> +			      <0 0x10002C00 0 0x0200>,
> +			      <0 0x1000B000 0 0x1000>;

Please use lowercase hex for addresses.

> +			reg-names = "iocfg0", "iocfg_bm", "iocfg_bl", "iocfg_br",
> +				    "iocfg_lm", "iocfg_rb", "iocfg_tl", "eint";
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +			gpio-ranges = <&pio 0 0 185>;
> +			interrupt-controller;
> +			interrupts = <GIC_SPI 186 IRQ_TYPE_LEVEL_HIGH 0>;
> +			#interrupt-cells = <2>;
> +		};
[..]
> +		xhci0: usb@...00000 {
> +			compatible = "mediatek,mt8186-xhci",
> +				     "mediatek,mtk-xhci";
> +			reg = <0 0x11200000 0 0x1000>,
> +			      <0 0x11203e00 0 0x0100>;
> +			reg-names = "mac", "ippc";
> +			interrupts = <GIC_SPI 294 IRQ_TYPE_LEVEL_HIGH 0>;
> +			phys = <&u2port0 PHY_TYPE_USB2>;
> +			clocks = <&topckgen CLK_TOP_USB_TOP>,
> +				 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_XHCI>,
> +				 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_HCLK>,
> +				 <&infracfg_ao CLK_INFRA_AO_ICUSB>,
> +				 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_REF>;
> +			clock-names = "sys_ck", "ref_ck", "mcu_ck", "dma_ck", "xhci_ck";

The clocks and clock-names don't match, can you confirm whether they're right?
(But keep this clock order, see the comment on xhci1 below)

> +			mediatek,syscon-wakeup = <&pericfg 0x420 2>;
> +			wakeup-source;
> +			status = "disabled";
> +		};
[..]
> +		xhci1: usb@...80000 {
> +			compatible = "mediatek,mt8186-xhci",
> +				     "mediatek,mtk-xhci";
> +			reg = <0 0x11280000 0 0x1000>,
> +			      <0 0x11283e00 0 0x0100>;
> +			reg-names = "mac", "ippc";
> +			interrupts = <GIC_SPI 324 IRQ_TYPE_LEVEL_HIGH 0>;
> +			phys = <&u2port1 PHY_TYPE_USB2>,
> +			       <&u3port1 PHY_TYPE_USB3>;
> +			clocks = <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_P1_SYS>,
> +				 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_P1_XHCI>,
> +				 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_P1_HCLK>,
> +				 <&infracfg_ao CLK_INFRA_AO_SSUSB_TOP_P1_REF>;
> +			clock-names = "sys_ck", "ref_ck", "mcu_ck", "xhci_ck";

The xhci dt-binding enforces this clock order:

	sys_ck, ref_ck, mcu_ck, dma_ck, xhci_ck

You can't skip dma_ck, otherwise you'll see a dtbs_check warning. So if this
hardware block has a fixed clock connected to the dma_ck slot (ie it isn't
controllable), then just add a fixed clock entry for it (eg <&clk26m>).

The clock names also look switched here, please double-check.

Thanks,
Nícolas

> +			mediatek,syscon-wakeup = <&pericfg 0x424 2>;
> +			wakeup-source;
> +			status = "disabled";
> +		};