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Message-ID: <2b50ad58-e5da-2f93-0c18-f16843fe64ac@nvidia.com>
Date: Thu, 3 Oct 2019 14:00:32 +0800
From: JC Kuo <jckuo@...dia.com>
To: Thierry Reding <thierry.reding@...il.com>
CC: <gregkh@...uxfoundation.org>, <jonathanh@...dia.com>,
<linux-tegra@...r.kernel.org>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<nkristam@...dia.com>, <skomatineni@...dia.com>
Subject: Re: [PATCH 6/6] arm64: tegra: Enable XUSB host in P2972-0000 board
On 10/2/19 6:26 PM, Thierry Reding wrote:
> On Wed, Oct 02, 2019 at 04:00:51PM +0800, JC Kuo wrote:
>> This commit enables XUSB host and pad controller in Tegra194
>> P2972-0000 board.
>>
>> Signed-off-by: JC Kuo <jckuo@...dia.com>
>> ---
>> .../arm64/boot/dts/nvidia/tegra194-p2888.dtsi | 31 +++++++++-
>> .../boot/dts/nvidia/tegra194-p2972-0000.dts | 59 +++++++++++++++++++
>> 2 files changed, 89 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
>> index 4c38426a6969..cb236edc6a0d 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi
>> @@ -229,7 +229,7 @@
>> regulator-max-microvolt = <3300000>;
>> };
>>
>> - ldo5 {
>> + vdd_usb_3v3: ldo5 {
>> regulator-name = "VDD_USB_3V3";
>> regulator-min-microvolt = <3300000>;
>> regulator-max-microvolt = <3300000>;
>> @@ -313,5 +313,34 @@
>> regulator-boot-on;
>> enable-active-low;
>> };
>> +
>> + vdd_5v_sata: regulator@4 {
>> + compatible = "regulator-fixed";
>> + reg = <4>;
>> +
>> + regulator-name = "vdd-5v-sata";
>
> Please keep capitalization of regulator names consistent. We use
> all-caps and underscores for the others (which mirrors the names in the
> schematics), so please stick with that for this one as well.
>
Sure. I will fix this.
> Also, I'm wondering if perhaps you can clarify something here. My
> understanding is that SATA functionality is provided via a controller on
> the PCI bus. Why is it that we route the 5 V SATA power to the USB port?
> Oh wait... this is one of those eSATAp (hybrid) ports that can take
> either eSATA or USB, right? Do we need any additional setup to switch
> between eSATA and USB modes? Or is this all done in hardware? That is,
> if I plug in an eSATA, does it automatically hotplug detect the device
> as SATA and if I plug in a USB device, does it automatically detect it
> as USB?
>
Yes, this 5V supply is for the eSATAp port. eSATA cable will deliver the 5V to
SATA device. No SATA/USB switch is required as USB SuperSpeed and PCIE-to-SATA
controller each has its own UPHY lane. SATA TX/RX pairs also have dedicated pins
at the eSATAp connector. External SATA drive can be hotplug and hardware will
detect automatically.
>> + regulator-min-microvolt = <5000000>;
>> + regulator-max-microvolt = <5000000>;
>> + gpio = <&gpio TEGRA194_MAIN_GPIO(Z, 1) GPIO_ACTIVE_LOW>;
>
> This will actually cause a warning on boot. For fixed regulators the
> polarity of the enable GPIO is not specified in the GPIO specifier.
> Instead you're supposed to use the boolean enable-active-high property
> to specify if the enable GPIO is active-high. By default the enable GPIO
> is considered to be active-low. The GPIO specifier needs to have the
> GPIO_ACTIVE_HIGH flag set regardless for backwards-compatibilitiy
> reasons.
>
> Note that regulator@3 above your new entry does this wrongly, but
> next-20191002 should have a fix for that.
>
Thanks for the information. I will fix this in the next revision.
>> + };
>> + };
>> +
>> + padctl@...0000 {
>
> Don't forget to move this into /cbb as well to match the changes to
> patch 5/6.
>
Sure, will do.
>> + avdd-usb-supply = <&vdd_usb_3v3>;
>> + vclamp-usb-supply = <&vdd_1v8ao>;
>> + ports {
>
> Blank line between the above two for better readability.
>
Okay.
>> + usb2-1 {
>> + vbus-supply = <&vdd_5v0_sys>;
>> + };
>> + usb2-3 {
>
> Same here and below.
>
>> + vbus-supply = <&vdd_5v_sata>;
>> + };
>> + usb3-0 {
>> + vbus-supply = <&vdd_5v0_sys>;
>> + };
>> + usb3-3 {
>> + vbus-supply = <&vdd_5v0_sys>;
>> + };
>> + };
>> };
>> };
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> index d47cd8c4dd24..410221927dfa 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> @@ -222,4 +222,63 @@
>> };
>> };
>> };
>> +
>> + padctl@...0000 {
>
> Same comment as above. Move this into /cbb.
>
>> + status = "okay";
>> +
>> + pads {
>> + usb2 {
>> + lanes {
>> + usb2-1 {
>> + status = "okay";
>> + };
>> + usb2-2 {
>
> And blank lines for readability here and below.
>
>> + status = "okay";
>> + };
>> + usb2-3 {
>> + status = "okay";
>> + };
>> + };
>> + };
>> + usb3 {
>> + lanes {
>> + usb3-0 {
>> + status = "okay";
>> + };
>> + usb3-3 {
>> + status = "okay";
>> + };
>> + };
>> + };
>> + };
>> +
>> + ports {
>> + usb2-1 {
>> + mode = "host";
>> + status = "okay";
>> + };
>> + usb2-3 {
>> + mode = "host";
>> + status = "okay";
>> + };
>> + usb3-0 {
>> + nvidia,usb2-companion = <1>;
>> + status = "okay";
>> + };
>> + usb3-3 {
>> + nvidia,usb2-companion = <3>;
>> + nvidia,disable-gen2;
>> + status = "okay";
>> + };
>> + };
>> + };
>> +
>> + tegra_xhci: xhci@...0000 {
>
> Also needs to move into /cbb. Also, you can drop the tegra_xhci label
> here since we never reference the controller from elsewhere.
>
> Also make sure to update the name here to match the changes in 5/6.
>
Got it. Thanks for the reminder.
> Thierry
>
>> + status = "okay";
>> + phys = <&{/padctl@...0000/pads/usb2/lanes/usb2-1}>,
>> + <&{/padctl@...0000/pads/usb2/lanes/usb2-3}>,
>> + <&{/padctl@...0000/pads/usb3/lanes/usb3-0}>,
>> + <&{/padctl@...0000/pads/usb3/lanes/usb3-3}>;
>> + phy-names = "usb2-1", "usb2-3", "usb3-0", "usb3-3";
>> + };
>> };
>> --
>> 2.17.1
>>
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