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Subject: Re: [PATCH 5/6] arm64: tegra: Add XUSB and pad controller on Tegra194
To:     Thierry Reding <thierry.reding@gmail.com>
CC:     <gregkh@linuxfoundation.org>, <jonathanh@nvidia.com>,
        <linux-tegra@vger.kernel.org>, <linux-usb@vger.kernel.org>,
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References: <20191002080051.11142-1-jckuo@nvidia.com>
 <20191002080051.11142-6-jckuo@nvidia.com> <20191002101001.GF3716706@ulmo>
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From:   JC Kuo <jckuo@nvidia.com>
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Date:   Thu, 3 Oct 2019 10:04:45 +0800
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On 10/2/19 6:10 PM, Thierry Reding wrote:
> On Wed, Oct 02, 2019 at 04:00:50PM +0800, JC Kuo wrote:
>> Adds the XUSB pad and XUSB controllers on Tegra194.
>>
>> Signed-off-by: JC Kuo <jckuo@nvidia.com>
>> ---
>>  arch/arm64/boot/dts/nvidia/tegra194.dtsi | 130 +++++++++++++++++++++++
>>  1 file changed, 130 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
>> index 3c0cf54f0aab..4d3371d3a407 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
>> @@ -1599,4 +1599,134 @@
>>  		interrupt-parent = <&gic>;
>>  		always-on;
>>  	};
>> +
>> +	xusb_padctl: padctl@3520000 {
>> +		compatible = "nvidia,tegra194-xusb-padctl";
>> +		reg = <0x0 0x03520000 0x0 0x1000>,
>> +			<0x0 0x03540000 0x0 0x1000>;
> 
> These should generally be aligned. Use tabs first and then spaces to
> make the opening < on subsequent lines align with the opening < on the
> first line. There are a couple more like this below.
Thanks. I will make those aligned.
> 
>> +		reg-names = "padctl", "ao";
>> +
>> +		resets = <&bpmp TEGRA194_RESET_XUSB_PADCTL>;
>> +		reset-names = "padctl";
>> +
>> +		status = "disabled";
>> +
>> +		pads {
>> +			usb2 {
>> +				clocks = <&bpmp TEGRA194_CLK_USB2_TRK>;
>> +				clock-names = "trk";
>> +
>> +				lanes {
>> +					usb2-0 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +					usb2-1 {
> 
> I prefer blank lines to visually separate blocks here and below.
Sure, will do.
> 
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +					usb2-2 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +					usb2-3 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +				};
>> +			};
>> +			usb3 {
>> +				lanes {
>> +					usb3-0 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +					usb3-1 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +					usb3-2 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +					usb3-3 {
>> +						nvidia,function = "xusb";
>> +						status = "disabled";
>> +						#phy-cells = <0>;
>> +					};
>> +				};
>> +			};
>> +		};
>> +
>> +		ports {
>> +			usb2-0 {
>> +				status = "disabled";
>> +			};
>> +			usb2-1 {
>> +				status = "disabled";
>> +			};
>> +			usb2-2 {
>> +				status = "disabled";
>> +			};
>> +			usb2-3 {
>> +				status = "disabled";
>> +			};
>> +			usb3-0 {
>> +				status = "disabled";
>> +			};
>> +			usb3-1 {
>> +				status = "disabled";
>> +			};
>> +			usb3-2 {
>> +				status = "disabled";
>> +			};
>> +			usb3-3 {
>> +				status = "disabled";
>> +			};
>> +		};
>> +	};
>> +
>> +	tegra_xhci: xhci@3610000 {
> 
> The tegra_xhci is unused, so I don't think we need to add it. Also, the
> name of this node should be usb@3610000 since it's the compatible string
> that defines (together with the bindings) that this is XHCI capable. But
> it is fundamentally a USB controller, so the name should reflect that.
> 
Understood. I will fix in the next revision.
>> +		compatible = "nvidia,tegra194-xusb";
>> +		reg = <0x0 0x03610000 0x0 0x40000>,
>> +			<0x0 0x03600000 0x0 0x10000>;
>> +		reg-names = "hcd", "fpci";
>> +
>> +		interrupts = <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>,
>> +				<GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>,
>> +				<GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> +		clocks = <&bpmp TEGRA194_CLK_XUSB_CORE_MUX>,
>> +			<&bpmp TEGRA194_CLK_XUSB_CORE_HOST>,
>> +			<&bpmp TEGRA194_CLK_XUSB_CORE_SS>,
>> +			<&bpmp TEGRA194_CLK_XUSB_FALCON>,
>> +			<&bpmp TEGRA194_CLK_XUSB_FALCON_HOST>,
>> +			<&bpmp TEGRA194_CLK_XUSB_FALCON_SS>,
>> +			<&bpmp TEGRA194_CLK_XUSB_FS>,
>> +			<&bpmp TEGRA194_CLK_XUSB_FS_HOST>,
>> +			<&bpmp TEGRA194_CLK_XUSB_SS>,
>> +			<&bpmp TEGRA194_CLK_XUSB_SS_SUPERSPEED>,
>> +			<&bpmp TEGRA194_CLK_UTMIPLL>,
>> +			<&bpmp TEGRA194_CLK_CLK_M>,
>> +			<&bpmp TEGRA194_CLK_PLLE>;
>> +		clock-names = "xusb_hs_src", "xusb_host",
>> +			"xusb_core_superspeed_clk", "xusb_falcon_src",
>> +			"xusb_falcon_host_clk", "xusb_falcon_superspeed_clk",
>> +			"xusb_fs_src", "xusb_fs_host_clk", "xusb_ss_src",
>> +			"xusb_ss", "pll_u_480m", "clk_m", "pll_e";
> 
> Some of these clocks are not defined in the bindings. Many of them are
> also not used by the driver. Are all of these really needed? If they
> are, please add the required ones to the bindings.
> 
> Also, for new ones, drop the _clk suffix. The fact that these are clocks
> is already conveyed by the property name.
> 
> Thierry
Thanks. I will clean this up.
> 
>> +
>> +		power-domains = <&bpmp TEGRA194_POWER_DOMAIN_XUSBC>,
>> +				<&bpmp TEGRA194_POWER_DOMAIN_XUSBA>;
>> +		power-domain-names = "xusb_host", "xusb_ss";
>> +
>> +		nvidia,xusb-padctl = <&xusb_padctl>;
>> +		status = "disabled";
>> +	};
>>  };
>> -- 
>> 2.17.1
>>