linux-kernel - Re: [PATCH v1 5/9] of: Add NVIDIA Tegra XHCI controller binding

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Date:	Wed, 25 Jun 2014 16:02:48 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-usb@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Kishon Vijay Abraham I <kishon@...com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1 5/9] of: Add NVIDIA Tegra XHCI controller binding

On Wed, Jun 25, 2014 at 2:54 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 06/18/2014 12:16 AM, Andrew Bresticker wrote:
>> Add device-tree binding documentation for the XHCI controller present
>> on Tegra124 and later SoCs.
>
>> diff --git a/Documentation/devicetree/bindings/usb/nvidia,tegra124-xhci.txt b/Documentation/devicetree/bindings/usb/nvidia,tegra124-xhci.txt
>
>> + - clock-names: Must include the following entries:
>> +    - xusb_host
>> +    - xusb_falcon_src
>> +    - xusb_ss
>> +    - xusb_ss_src
>> +    - xusb_hs_src
>> +    - xusb_fs_src
>
> Looking at include/dt-bindings/clock/tegra124-car.h I see a few entries
> potentially missing here:
>
> #define TEGRA124_CLK_XUSB_HOST_SRC 252
> #define TEGRA124_CLK_XUSB_DEV_SRC 256
> #define TEGRA124_CLK_XUSB_DEV 257
> #define TEGRA124_CLK_XUSB_SS_DIV2 312

The driver doesn't use them, so I didn't put them in the binding.

>> +    - pll_u_480m
>
> Not just pll_u?

We specifically want pll_u_480M as that's what we use as the parent of
xusb_ss_src when scaling it to 120Mhz.
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